dasar ilmu tanah – morfologi dan klasifikasi
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MORFOLOGI TANAHDAN
KLASIFIKASI TANAHSumber: foto:smno.kampus.ub.jan2013
MORFOLOGI TANAH
Sumber: . http://en.wikipedia.org/wiki/Soil_morphology …….. DIUNDUH 25/2/2013
SOIL MORPHOLOGY - SIFAT-SIFAT TANAH yang dapat DIAMATI di LAPANGAN dalam berbagai horison tanah , dan deskripsi macam dan
tatanan horison.
C.F. Marbut championed reliance on soil morphology instead of on theories of pedogenesis for soil classification because theories of soil genesis are both
ephemeral and dynamic (Soil Survey Staff (1993). Soil Survey Manual. Washington D.C.: U. S. Government Printing Office. Soil Conservation Service, United States Department of
Agriculture Handbook 18).
Sifat-sifat yang dapat diamati dan dideskripsikan di lapangan meliputi: komposition, bentuk, struktur tganah dan organisasi tanah, warna tanah dan becak-becaknya,
distribusi akar dan pori, bukti-bukti adanya translokasi material seperti carbonates, iron, manganese, carbon dan clay; serta konsistensi tanah.
Observasi lapangan biasanya dilakukan pada suatu PROFIL TANAH. Profil tanah merupakan potongan vertikal dua dimensi, dalam tanah dan terikat pada
salah satu sisi suatu PEDON.PEDON adalah unit tiga dimensi terkecil, tetapi tidak kurang dari 1 m2 di permukaan
tanah yang mampu menangkap variabilitas lateral.
HORISON TANAH
Sumber: . http://en.wikipedia.org/wiki/Soil_horizon …….. DIUNDUH 25/2/2013
HORISON TANAH merupakan “lapisan” yang sejajar dnegan permukana tanah, karakteristik fisiknya berbeda dengan lapisan-
lapisan di atas dan di bawahnya.
Setiap tanah mempunyai minimum satu horison, biasanya tiga atau empat horison.
Horizons dicirikan oleh sifat-sifat fisikanya, terutama warna dan teksturnya.
Sifat-sifat ini dapat dideskripsikan secara absolut (mis. Distribusi ukuran partikel, untuk tekstur tanah) dan secara relatif dalam
kaitannya dnegan material skeitarnya , mis. Lebih kasar atau lebih-berpasir dibandingkan dnegan horison di sebelah atas atau
bawahnya.
MORFOLOGI TANAH
Sumber: . http://en.wikipedia.org/wiki/Soil_horizon …….. DIUNDUH 25/2/2013
O (Organic matter): Lapisan seresah sisa-sisa tumbuhan yang relatif masih belum mengalami dekomposisi.
A (Tanah permukaan) : Lapisan tanah mineral dengan akumulasi bahan organik dan soil life. Lapisan ini meng-eluviasikan iron, liat, aluminum, senyawa organik, dan komponen terlarut lainnya. Kalau eluviasi ini snagat intensif, akan tampak horison E yang warnanya lebih terang di bagian bawah horison A. A-horizons may also be the result of a combination of soil bioturbation and surface processes that winnow fine particles from biologically mounded topsoil. In this case, the A-horizon is regarded as a "biomantle".
B (Subsoil): Lapisan ini mengakumulasikan besi, liat, aluminum dan senyawa organik, prosesnya disebut ILUVIASI.
C (Batuan/Bahan Induk) : Lapisan batuan berukuran besar-besra yang belum hancur. Lapisan ini mengakumulasikan senyawa-senyawa yang dapat larut .
R (Batuan dasar): Lapisan batuan-dasar yang baru lapuk parsial, di bagian dasar prosil tanah. Horison ini terdiri atas massa yang kontinyus, batuan keras yang tidak dapat digali dnegan tangan. Tanah-tanah yang terbentuk secara in situ akan menunjukkan kesamaan dengan batuan-dasar ini.
KLASIFIKASI TANAH
Sumber: . http://en.wikipedia.org/wiki/Soil_classification …….. DIUNDUH 25/2/2013
KLASIFIKASI TANAH: berkenaan (berhubungan) dengan KATEGORISASI TANAH SECARA SISTEMATIS berdasarkan pada karakteristik pembeda (penciri) dan
kriteria yang telah ditetapkan.
Sistem Internasional saat ini:
1. Buol, S.W., Southard, R.J., Graham, R.C., and McDaniel, P.A. (2003). Soil Genesis and Classification, 5th Edition. Iowa State Press - Blackwell, Ames, IA.
2. Driessen, P., Deckers, J., Spaargaren, O., & Nachtergaele, F. (Eds.). (2001). Lecture notes on the major soils of the world. Rome: FAO.
3. FAO. (1998). World Reference Base for Soil Resources. Rome: Food and Agriculture Organization of the United Nations.
KLASIFIKASI TANAH
Sumber: Keys to Soil Taxonomy, Eighth Edition. 1998. …….. DIUNDUH 15/2/2013
Untuk dapat mengelola lahan dengan tepat kita harus mengetahui seperti apa “tanah” yang kita hadapi, dan bagaimana tanah-tanah ini berbeda-beda di antara satu
lokasi dengan lokasi lainnya.
Sistem klasifikasi memungkinkan kita untuk mengkomunikasikan berbagai tanah-tanah ini dan
pengelolaannya.
TAKSONOMI TANAH
Sumber: . http://en.wikipedia.org/wiki/USDA_soil_taxonomy …….. DIUNDUH 25/2/2013
USDA Soil Taxonomy developed by United States Department of Agriculture and the National Cooperative Soil Survey provides an
elaborate classification of soil types according to several parameters (most commonly their properties) and in several levels:
Order, Suborder, Great Group, Subgroup, Family, and Series.
Contoh klasifikasi suatu Tipe Tanah:
Order : EntisolsSuborder : Fluvents Great Group : Torrifluvents Subgroup : Typic Torrifluvents Family : Fine-loamy, mixed, superactive, calcareous, Typic Torrifluvents Series : Jocity, Youngston.
ORDO TANAH
Sumber: . http://en.wikipedia.org/wiki/USDA_soil_taxonomy …….. DIUNDUH 25/2/2013
1. Alfisols — pelapukan moderat, berkembang pada kondisi hutan berdaun lebar atau boreal, kaya Fe dan Al.
2. Andisols — berkembang pada bahan abu-vulkanik, dan kaya bahan-bahan koloidal gelas dan amorf, termasuk allophane, imogolite dan ferrihydrite.
3. Aridisols — (dari bahasa Latin “aridus” berarti “kering”) tanah berkembang pada kondisi iklim arid atau semiarid
4. Entisols — tidak menunjukkan perkembangan profil tanah yang "significant“. Horison-horisn tanah minimal.
… dst …..
E horizon
A horizon
B horizon(Illuvial)
(Elluvial)
C horizon
R horizon
O horizon
HORISON UTAMA = Master Horizons
B horizon
Informasi tentang tanah
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
Pengenalan Sub-horizon
p – pembajakan/pengolahan/gangguant – akumulasi liatg – pembentukan gleih – illuvial bahan organikw – perkembangan warna/ strukturo – oksik
Pembeda Subordinate di dalam Horison Utama
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
Pembeda (penciri) Subordinat (p = plowed)
Horison permukaan yang terganggu (kultivasi, pasture, kehutanan)
Digunakan dnegan Horison A (mis. Horison Ap)
Ap horizon
Sumber: http://nesoil.com/images/paxton.htm …… DIUNDUH 15/2/2013
Contoh deskripsi Ap:
Ap -- 0 - 12 inch; coklat tua (10YR 3/3) Lemoung liat berdebu; struktur gumpal-bersudut , halus, kuat; remah, agak lekat dan plastis; banyak akar; banyak pori halus dan medium; sangat masam (pH 4.8); batas horison abrupt smooth. (tebalnya 10 - 13 inch).
Subordinate distinction (t = clay accumulation)Translokasi liat atau terbentuk di tempatCoatings atau diskritDigunakan dnegan Horison B (mis. Horison Bt)Kalau reduksi, dapat digunakan dengan subhorizon g (mis. Horison Btg)
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
Contoh deskripsi Horison Bt:
B21 -- 12 - 22 inch; coklat tua (7.5YR 3/2) lempung liat berdebu; struktur prismatik medium moderat yang bercampur dengan struktur gumpal bersudut halus mdeium moderat; keras, gembur, agak lekat, plastis dan licin-moderat; banyak akar; banyak pori halus dan sangat halus; banyak selimut berbutir halus pada pori dan pada ped; sangat masam (pH 5.5); batas horison clear smooth. (tebal 10 - 12 inch)
Pembeda Subordinat (g = gleying)1. Oksigen kurang atau kondisi reduksi karena jenuh air.2. Reduksi besi (Fe III menjadi Fe II)3. Khroma rendah4. Sering digunakan dnegan Horison B (mis. Horison Bg), juga dnegan
horison E dan C.
Materialglei
Materialoksidasi
oksidasiFe3+
Fe2+
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
Photographs showing redoximorphic features (soil mottling) which are color patterns in the soil formed by the oxidation and reduction of iron and/or
manganese caused by saturated conditions within the soil. Redoximorphic features are used to estimate the depth to seasonal high watertable
Subordinate distinction (h = akumulasi organik)1. Akumulasi iluvial kompleks
bahan organik - logam2. Selimut pada pasir dan partikel
diskrit3. h = “humik”4. Value dan chroma sekitar 3
atau kurang5. Digunakan dnegan Horison B
(mis. Horison Bh)
Horison Bh“horison spodik”
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
Contoh: Horison Bh :
Horison subsoil , 'B' menyatakan horison B dan 'h' menyatakan “humik”. Bahan organik dan aluminium snagat dominan (sedikit sekali sneyawa besi). Istilah ini digunakan untuk mendefinisikan Ordo Podosol dalam sistem klasifikasi “Australian Soil Classification” (Isbell, 1996).
Horison Bh pada kedalaman 30-40 cm di lokasi West Gippsland Podosol.
Sumber: http://vro.dpi.vic.gov.au/dpi/vro/vrosite.nsf/pages/gloss
_AC…….. DIUNDUH 25/2/2013
Pembeda Subordinat (w = warna atau struktur)
Perkembangan warna atau struktur secara Non-illuvial“w” dapat = “weak”
Biasanya digunakan dnegan Horison B (mis. Bw.)
Bw
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
Pembeda Subordinat (o = horison oksik)
Aktivitas liat rendahSedikti material dapat lapuk
Struktur batuan tampak sedikitOksida Fe dan Al
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
Horison oksik mempunyai:
a. The CEC7 < 16cmol(+)/kg of clay and an ECEC < 12 cmol(+)/kg of clay which is due to the low activity clay minerals (1:1 clays, Fe and Al oxides, etc)
b. < 10% mineral dapat lapuk dalam fraksi pasir
c. Struktur batuan < 5%
Pembeda Subordinat
g – gleying h – illuvial bahan organik p – pengolahan tanah / pembajakan/ gangguan t – akumulasi liat w – perkembangan warna / struktur tanah o – oksik
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
PEMBEDA SUBORDINAT&
BAHAN ORGANIK
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
Subordinate distinction (a, e, i)Menyatakan derajat dekomposisi bahan organik dalam
Horison O.
Oa – dekomposisi lanjut (saprik)Oe – dekomposisi moderat (hemik)Oi – dekomposisi ringan (fibrik)
Saprik –decomposisi lanjut, serat tumbuhan sedikit, kadar air rendahHemik –dekomposisi intermedierFibrik – dekomposisi ringan, serat-serat masih dapat dikenali
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
IKHTISAR
Horison Utama: O, A, E, B, C, R
Simbul Sub horizon : g, h, p, t, w and a,e,i
Contoh: Oa, Oe, OiBtBgBtgBwAp
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
OTHER DESIGNATIONS
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
Pembagian Vertikal
Dicirikan oleh horison utama yang serupa dan/atau ciri-ciri subordinat yang dipisahkan oleh “derajat”.
Bt1
Bt2
Bt3
Horison Bt
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
Horison Transisi
Lapisan transisi di antara horison utama.
AEEBBE
Karakter Dominan
KarakterSubordinat
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
Synthesis
Ap
AE
E
Bh
Btg1
Btg2
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
Stages of development of soils across time for a soil in the central United States under forest.
(diunduh dari: http://www.soils.wisc.edu/courses/SS325/formation.htm … 25/2/2013
SOIL TAXONOMY
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
TAKSONOMI TANAH
Ada banyak sistem klasifikasi tanah yang digunakan saat ini, masing-masing memenuhi kebutuhan negara penggunanya. Salah satunya adalah “Soil
Taxonomy”, sisten klasifikasi tanah yg dipakai di USA dan di berbagai negara dunia lainnya. “Soil Taxonomy” menggunakan konsep tanah sebagai “tubuh
alamiah” dan mendasarkan pada ciri-ciri tanah yang dapat diamati dan diukur. Sistem ini juga menggunakan tata-nama unik yang mencerminkan
karakteristik utama dari tanah.
Soil Taxonomy utilizes many chemical, physical, and biological properties including soil moisture and soil temperature status. In addition, the presence or absence of certain
diagnostic horizons in the soil profile helps ascertain the soil's classification category. A diagnostic horizon is a layer or soil zone whose properties meet certain
criteria specified for the purposes of classification.
Horison penciri (diagnostik) dapat terdiri atas satu atau lebih horison genetik. Tujuh horison penciri ini disebut “EPIPEDON”, horion permukaan. Delapan-belas
horison penciri bawah-permukaan digunakan untuk mencirikan berbagai tanah dalam sistem Soil Taxonomy. Selain itu, lima rezim lengas tanah dan sepuluh
rezim suhu tanah membantu untuk mengidentifikasi “kategori” tanah.
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
KATEGORI TAKSONOMI TANAH
Dalam sistem Soil-Taxonomy, semua tanah di dunia diklasifikasikan dalam kategori berikut (dari pengelompokkan secara umum hingga “tanah” yg paling spesifik): ordo
(12), subordo (63), great groups (sekitar 250), subgroups (sekitar 1,400), famili (sekitar 8,000), dan seri ( > 20,000).
Semua tanah termasuk ke dalam salah satu dari 12 ordo, yang dari ordo lainnya terutama oleh adanya atau tidak adanya “HORISON PENCIRI”
Dalam setiap ORDO ada SUB-ORDO yang dibedakan satu sama lainnya oleh perbedaan rezim lengas-tanah dan rezim suhu-tanah, dan oleh ciri-ciri fisika dan kimia
yang dominan.. In turn, each suborder is subdivided into great groups differing in the presence or absence of diagnostic horizons (including impervious pans), and in levels of certain
chemicals such as clays and salts. Each great group is comprised of a number of subgroups that are characterized by a central (typic) member and by other members that are intergrades toward other orders,
suborders or great groups, or that have characteristics not shared with the typic member.
Within each subgroup are soil families that vary in properties that are important for plant growth or for engineering uses of the soil.
Dalam setiap FAMILI ada sejumlah SERI-TANAH, kategori yang paling spesifik dari sistem klasifikasi ini. SERI-TANAH diidentifikasi dalam survei lokal dan diberi nama
yang “bermakna lokal” (mislanya nama lokasinya).
Berdasarkan karakteristik profil tanah danKonsep tanah sebagai tubuh alami.
Ciri-ciri yang tampak: warna, tekstur, struktur, pH, BO,….…
Profil TanahHierarkhis
GENESIS TANAH
1883 V.V. Dukachaev: climate, vegetation, soil
1927 C.F. Marbut (USDA) applied to U.S. (1965)
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
KLASIFIKASI TANAH / TAKSONOMI
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
TERMINOLOGI TAKSONOMI TANAHNama kelas tanah mencerminkan ciri-ciri tanah. Tata-nama bersifat logis dan
sederhana. Misalnya, “akar” dari nama-nama ordo tanah diambil dari kata-kata Latin, Greek, atau salah satu dari bahasa modern. Kepada “akar” ini ditambahkan suatu sukukata “sols”. Sehingga “akar” dari Mollisols berasal dari bahasa Latin “mollis”, yang berarti “lunak”, ini mencerminkan ciri tanah yang gembur dan mudah diolah.
The names of specific class members in categories below that of soil orders include the root elements of the soil order name plus specific formative elements or
expressions that suggest distinctive soil properties. For example, consider the names of the lower categories of Alfisols and Mollisols that are formed under somewhat dry
conditions (Ustic-Latin ustus, burnt implying dryness), have a natric (high sodium (Na)) horizon and are typical of the subgroup in which they are classed:
Ordo Alfisols MollisolsSubordo (kering) Ustalfs Ustolls Great group (natrik) Natrustalfs Natrustolls Subgroup (typical) Typic Natrustalfs Typic Natrustolls Nama famili-tanah menyatakan tekstur tanah, komposisi mineral, dan kelas suhu-tanah hingga lapisan tanah-atas 50 cm, seperti Typic Natrustolls, smectitik halus, mesik. Nama Seri-tanah berhubungan dnegan lokasi tempat pertama-kalinya “tanah” diklasifikasikan (diidentifikasi/dideskripsikan).
Ordo
Subordo
Great group
Sub group
Famili
Seri
12
19,000
63
250
1400
8000
KingdomPhylumClassOrder FamilyGenus
Species
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
HIERARKHI KLASIFIKASI TANAH / TAKSONOMI
Pedon – unit tiga dimensi terkecil yg menyajikan seluruh sifat dari ciri suatu tanah (luasnya 1-10 m2)
- Unit dasar dari klasifikasi tanah.
Polipedon – kelompok pedon yang berhubungan erat di lapangan
Seri Tanah – class of soils world-wide which share a common suite of soil profile properties
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
UNIT-UNIT UNTUK KLASIFIKASI TANAH
The two extremes of most soil classification systems are the soil that represents all soils collectively around the world, and a soil that is a specific natural body
with characteristics that distinguish it from other such natural bodies. Suatu tanah dapat dikarakterisasikan oleh suatu unit (hipottetis) kecil tiga-dimensi yang
disebut “PEDON”, luasnya sekitar 10 m2 di permukaan. Area ini terlalu kecil untuk berfungsi sebagai unit klasifikasi lapangan yang praktis. Akan tetapi beberapa PEDON
yang saling bersambungan kontinyu satu-sama lain yang merupakan POLIPEDON pada akhirnya menjadi apa yang disebut “INDIVIDU TANAH”.
INDIVIDU-TANAH ini setara dengan SERI-TANAH.
Lanskap PolipedonIndividu Tanah
Pedon
Profil tanah
Unit sampling tanah
Seri Malabar
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
Pedon
Lanskap
Polipedon
Horison Permukaan
Horison Bawah-permukaan
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
HORISON PENCIRIHorison tanah, sifat-ciri dan material
dimaksudkan untuk merefleksikan sifat-sifat tanah dan yang dapat dipakai
untuk mendeskripsikan dan mendefinisikan kelas-tanah.
Mereka dianggap sebagai “penciri” atau"diagnostic" kalau memenuhi derajat ekspresi minimum, yang ditentukan
oleh kenampakannya,pengukurannya, kepentingannya,
relevansinya dan kriteria kuantitatifnya.
To be considered diagnostic, soilhorizons also require a minimum
thickness, which must be appraised in relation to bioclimatic factors
(e.g. an albic horizon in boreal regions is not expected to be as thick as one in
the tropics).
MolikUmbrikOkhrikHistik
MelanikPlaggen
Anthropik
Sumber: http://www.soils.wisc.edu/courses/SS325/organic.htm…….. DIUNDUH 25/2/2013
HORISON-PERMUKAAN PENCIRIEpipedons
Apakah kejenuhan basa >50%?
Apakah horison kaya P2O5 ?
Apakah horison mineral ?
Jenuh air > 30 hari
MolikHistik
Umbrik
Okhrik
Melanik
Plaggen
Anthropik
X
X
X
X
X = Florida
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
HORISON PERMUKAAN PENCIRI
Tebal > 18-25 cmWarna - Color Value < 3.5 lembab
Khroma < 3.5 lembabC-Organik > 0.6 %Kejenuhan basa > 50 %Struktur Sangat berkembang
C-Organik = Bahan organik x 0.5
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
EPIPEDON MOLIK
Memenuhi semua kriteria epipedon Molik,kecuali kejenuhan basanya < 50%
Secara kimiawi berbeda dnegan Molik
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
EPIPEDON UMBRIK
Terlalu: tipis terang warna miskin BO
Mollic
Umbric
Okhrik = pucat
Extremely common
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
EPIPEDON OKHRIK
Horison OrganikTerbentuk di daerah basah
Hitam – Coklat tuaBobot isinya rendahTebalnya 20-30 cm
Organik = > 20% - 35% BO. (kejenuhan air, kadar liat)
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
EPIPEDON HISTIK
Similar in properties to Mollic
Formed in volcanic ash
Lightweight, Fluffy
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
EPIPEDON MELANIK
1. Resembles mollic (color, o.m.)
2. Use by humans3. Shells and bones4. Water from humans
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
HORISON ANTHROPIK
Plaggen EpipedonProduced by long-term (100s yrs.) manuring
Horison permukaan yang tua dan hasil aktivitas manusia
Tebalnya > 50 cm
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
Epipedon:MolikUmbrikOchrikHistikMelanikPlaggenAnthropik
Sangat umum
Hasil aktivitas manusia
“spesifik”
Sumber: soillab.ifas.ufl.edu/.../Lecture%2023%20Soil%20Taxonomy.ppt …….. DIUNDUH 15/2/2013
HORISON PERMUKAAN PENCIRI
Vegetasi
Akumulasi BO
waktu
AKUMULASI BAHAN ORGANIK
Histik
Mollik, Umbrik
ochrik
Bahan induk
tmax = 3000 tahun
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DIAGNOSTIC SUB-SURFACE HORIZONS
HORISONBAWAH-PERMUKAAN
PENCIRI
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Liat Bahan Organik Oksida
Pembentukan/GenesisTranslokasi
Transformasi
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HORISON BAWAH-PERMUKAAN PENCIRI
Bahan Organik Liat OksidaSmectitesKaolinite
Juga: Garam, Karbonat, Sulfida
Warna gelapLogam (Fe, Al)
IronAluminum
GenesisTranslokasi
Transformasi
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HORISON BAWAH-PERMUKAAN
AlbikArgillikSpodik Oksik
CambikKandik
SombrikSulfurik
NatrikAgrik
Kalsik GipsikSalik
DuripanFragipan
Plasik
Penyebutan Sub-Horizon
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HORISON BAWAH-PERMUKAAN PENCIRI
Horison Albik (putih)Warna terang (Value > 6 lembab )Elluvial (Horison E *)Miskin liat, oksida Fe dan AlUmumnya berpasirReaktivitas kimiawi rendah (KTK rendah)Typically overlies Bh or Bt horizons Warna terang
albic
*Tidak semua horison E adalah horison albik
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HORISON BAWAH-PERMUKAAN PENCIRI
Horison ArgilikIlluvial accumulation of silicate clays Illuvial based on overlying horizonJembatan LiatSelimut Liat
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HORISON BAWAH-PERMUKAAN PENCIRI
Horizon Argilik Horison Kandik
Aktivitas liatTinggi Rendah
Illuviasi liatNecessary Not Necessary
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HORISON BAWAH-PERMUKAAN PENCIRI
Horison Spodik
Spodic
• Illuvial accumulation of organic matter and aluminum (+/- iron)• Dark colored (value, chroma < 3)• Low base saturation (acidic)• Formed under humid acid conditions
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HORISON BAWAH-PERMUKAAN PENCIRI
Elluviation (E horizon)
Organic matter Clays
Spodic horizon
Bh horizon Bt horizon
Argillic horizon
Elluviation and Illuviation
A
E
Bh
A
Bt
E
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Oxic horizon
• Highly weathered (high temperatures, high rainfall)
- High in Fe, Al oxides- High in low-activity clays (kaolinite < smectite < vermiculite)
activity
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HORISON BAWAH-PERMUKAAN PENCIRI
AlbicKandicArgillicSpodic Oxic
HORISON PENCIRI = Diagnostic Horizons
MollicUmbricOchricHisticMelanicPlaggenAnthropic
Epipedons Subsurface
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PERMUKAAN BAWAH-PERMUKAAN
SOIL TAXONOMY
1. Diagnostic Epipedons2. Diagnostic Subsurface
horizons3. Moisture Regimes4. Temperature Regimes
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DIAGRAM DERAJAT PERKEMBANGAN TANAH
Sumber: Keys to Soil Taxonomy, Eighth Edition. 1998. …….. DIUNDUH 15/2/2013
Vertisols(Liat
mengembang)
Mollisols(Lunak, gelap)
Andisols(Vulkanik)
Inceptisols(Baru mulai)
Spodosols(Horison Spodik)
Oxisols(Oksida)
Entisol(recent)
Ultisols(liat sngt masam)
Alfisols(liat agak masam)
Aridisols(kering)
Histosols(organik)
Gelisols(permafrost)
Derajat pelapukan dan perkembangan tanah
Ringan /sedikit Intermediate Kuat
KUNCI ORDO TANAH
Sumber: Keys to Soil Taxonomy, Eighth Edition. 1998. …….. DIUNDUH 15/2/2013
Mollisols
Alfisols
Inceptisols
Entisols
Ordo Tanah
Gelisols
Histosols
Spodosols
Andisols
Oxisols
Vertisols
Aridisols
Ultisols
Penciri utama
Tanah-tanah dengan permafrost di dalam 100 cm atau cryoturbasi dan permafrost di dalam 200 cm
Tanah-tanah dengan horison spodik di dalam 2 m permuakan tanah dan tanpa ciri andik
Tanah-tanah dengan ciri andik (BI rendah, bahan gelas vulkanik, pumice, …)
Tanah-tanah dengan horison oksik di dalam 150 cm permukaan tanah
Tanah-tanah dengan 30% atau lebih liat hingga kedalaman 50 cm dan ciri mengembang-mengkerut
Tanah-tanah dengan rezim kelengasan aridik dan menunjukkan perkembangan horison B atau horison salik
Tanah-tanah dg horison argilik atau kandik atau fragipan dan kejenuhan basanya <35% pd kedalaman 2 m atau 75 cm di bawah fragipan
Tanah-tanah dg epipedon molik dan kejenuhan basa >50% hingga lapisan kedap atau pd 1.8 m dari permukaan tanah
Tanah-tanah dg horison argilik, kandik atau natrik atau fragipan dengan selimut liat
Tanah-tanah dg horison kambiki, sulfurik, kalsik, gipsik,petrokalsik, atau petrogipsik, atau dengan epipedon molik, umbrik, atau histik, atau dengan ESP > 15% , atau fragipan
UNSUR PEMBENTUK ORDO
Sumber: Keys to Soil Taxonomy, Eighth Edition. 1998. …….. DIUNDUH 15/2/2013
Ordo Tanah Derivasi Unsur Pembentukan
Alfisols alf.Andisols Ando = tanah hitam and.Aridisols aridus = kering id.Entisols ent.Gelisols gelid = sangat dingin el.Histosols histos = jaringan ist.Inceptisols Inceptum = mulai, awal ept.Mollisols Mollis = lunak oll.Oxisols Oxide = oksida ox.Spodosols Spodos = abu kayu od.Ultisols Ultimus = akhir ult.Vertisols Verto = membalik ert.
UNSUR FORMATIFUnsur Formatif Konotasi unsur formatifalb Adanya horison albik (horison eluvial yang tercuci)anthr Adanya epipedon anthropik atau epipedon plaggenaqu Karakteristik yang berhubungan dnegan kebasahanar Horison tercampur / campuranarg Adanya horisom argilik (horison dnegan liat iluvial)calc Adanya horison kalsikcamb Adanya horison kambikCry DinginClur Adanya duripanfibr Fase dekomposisi ringan / awalfluv Dataran banjirfol Massa dedaunangyps Adanya horiosn gipsikhem Fase dekompoisisi intermedier
UNSUR FORMATIFUnsur Formatif Konotasi unsur formatifHist Adanya epipedon HistikHum Adanya bahan organikorth Paling lazimper Iklim humid sepanjang tahun, rezim air perudikpsamm Tekstur pasirrend Rendzinalike – kaya karbonatsal Adanya horison salik (saline)sapr Fase dekomposisi lanjuttorr Biasanya keringturb Cryoturbasiud Iklim humidust Iklim kering, biasanya panas selama summervitr Menyerupai gelasxer Sumer kering, winter lembab
KUNCI TAKSONOMI TANAH: ORDO
Sumber: Keys to Soil Taxonomy, Eighth Edition. 1998. …….. DIUNDUH 15/2/2013
GELISOLS
Tanah-tanah yang mempunyai:1. Permafrost di dalam 100 cm tanah permukaan; atau2. Material Gelik di dalam 100 cm tanah permukaan dan
permafrost di dalam 200 cm tanah permukaan.
KUNCI TAKSONOMI TANAH: ORDO
Sumber: Keys to Soil Taxonomy, Eighth Edition. 1998. …….. DIUNDUH 15/2/2013
HISTOSOLS
1. Do not have andic soil properties in 60 percent or more of the thickness between the soil surface and either a depth of 60 cm or a densic, lithic, or paralithic contact or duripan if shallower; and
2. Mempunyai material tanah organik yg memenuhi satu atau lebih berikut: • Overlie cindery, fragmental, or pumiceous materials and/or fill their interstices1 and directly
below these materials, have a densic, lithic, or paralithic contact; or• When added with the underlying cindery, fragmental, or pumiceous materials, total 40 cm or
more between the soil surface and a depth of 50 cm; or• Constitute two-thirds or more of the total thickness of the soil to a densic, lithic, or paralithic
contact and have no mineral horizons or have mineral horizons with a total thickness of 10 cm or less; or
• Jenuh air selama 30 hari atau lebih per tahun pada tahun-tahun normal (atau drainage buatan), mempunyai batas atas di dalam 40 cm tanah permukaan, dan mempunyai tebal total :
• 60 cm atau lebih kalau tiga-perempat atau lebih volumenya terdiri atas serat-moss atau kalau bobot-isinya pada kondisi lembab kurang dari 0.1 g/cm3; ATAU
• 40 cm atau lebih kalau terdiri atas material saprik atau hemik, atau material fibrik dengan kurang dari tiga-perempat (volumenya) serat-moss dan bobot isinya pd kondisi lembab 0.1 g/cm3 atau lebih.
KUNCI TAKSONOMI TANAH: ORDO
Sumber: Keys to Soil Taxonomy, Eighth Edition. 1998. …….. DIUNDUH 15/2/2013
PODOSOLSOther soils that do not have a plaggen epipedon or an argillic or kandic horizon above a spodic horizon, and have one or more of the following:A spodic horizon, an albic horizon in 50 percent or more of each pedon, and a cryic soil temperature regime; orAn Ap horizon containing 85 percent or more spodic materials; orA spodic horizon with all of the following characteristics:
One or more of the following:A thickness of 10 cm or more; orAn overlying Ap horizon; orCementation in 50 percent or more of each pedon; orA coarse-loamy, loamy-skeletal, or finer particle-size class and a frigid temperature regime in the soil; orA cryic temperature regime in the soil; and
An upper boundary within the following depths from the mineral soil surface: eitherLess than 50 cm; orLess than 200 cm if the soil has a sandy particle-size class in at least some part between the mineral soil surface and the spodic horizon; and
A lower boundary as follows:Either at a depth of 25 cm or more below the mineral soil surface or at the top of a duripan or fragipan or at a densic, lithic, paralithic, or petroferric contact, whichever is shallowest; orAt any depth,
If the spodic horizon has a coarse-loamy, loamy-skeletal, or finer particle-size class and the soil has a frigid temperature regime; orIf the soil has a cryic temperature regime; and
Either:A directly overlying albic horizon in 50 percent or more of each pedon; orNo andic soil properties in 60 percent or more of the thickness either:
Within 60 cm either of the mineral soil surface or of the top of an organic layer with andic soil properties, whichever is shallower, if there is no densic, lithic, or paralithic contact, duripan, or petrocalcic horizon within that depth; orBetween either the mineral soil surface or the top of an organic layer with andic soil properties, whichever is shallower, and a densic, lithic, or paralithic contact, a duripan, or a petrocalcic horizon.
KUNCI TAKSONOMI TANAH: ORDO
Sumber: Keys to Soil Taxonomy, Eighth Edition. 1998. …….. DIUNDUH 15/2/2013
ANDISOLSTanah-tanah lain yang mempunyai ciri andik dalam 60 % atau lebih ketebalannya, yaitu:
1. Within 60 cm either of the mineral soil surface or of the top of an organic layer with andic soil properties, whichever is shallower, if there is no densic, lithic, or paralithic contact, duripan, or petrocalcic horizon within that depth; or
2. Between either the mineral soil surface or the top of an organic layer with andic soil properties, whichever is shallower, and a densic, lithic, or paralithic contact, a duripan, or a petrocalcic horizon.
KUNCI TAKSONOMI TANAH: ORDO
Sumber: Keys to Soil Taxonomy, Eighth Edition. 1998. …….. DIUNDUH 15/2/2013
OXISOLS
Tanah-tanah lain yang mempunyai:
1. Horison oksik yang batas atasnya di dalam 150 cm tanah permukaan (mineral) dan tidak ada horison kandik yang batas atasnya di dalam kedalaman 150 cm tersebut; ATAU
2. 40 percent or more (by weight) clay in the fine-earth fraction between the mineral soil surface and a depth of 18 cm (after mixing) and a kandic horizon that has the weatherable-mineral properties of an oxic horizon and has its upper boundary within 100 cm of the mineral soil surface.
KUNCI TAKSONOMI TANAH: ORDO
Sumber: Keys to Soil Taxonomy, Eighth Edition. 1998. …….. DIUNDUH 15/2/2013
VERTISOLS
Tanah-tanah lain yang mempunyai:
1. Lapisan yg tebalnya 25 cm atau lebih, dengan batas-atasnya di dalam 100 cm tanah (mineral) permukaan, yang mempunyai bidang-bidang geser atau agregat berbentuk “wedge” yg mempunyai sumbu-panjangnya 10 - 60 derajat dari horisontal; dan
2. A weighted average of 30 percent or more clay in the fine-earth fraction either between the mineral soil surface and a depth of 18 cm or in an Ap horizon, whichever is thicker, and 30 percent or more clay in the fine-earth fraction of all horizons between a depth of 18 cm and either a depth of 50 cm or a densic, lithic, or paralithic contact, a duripan, or a petrocalcic horizon if shallower; dan
3. Retakan-retakan di permukaan, yang membuka dan menutup secara periodik.
KUNCI TAKSONOMI TANAH: ORDO
Sumber: Keys to Soil Taxonomy, Eighth Edition. 1998. …….. DIUNDUH 15/2/2013
ARIDISOLSTanah-tanah lainnya yang :MEMPUNYAI:
1. Rezim lengas-tanah ARIDIK; dan2. Epipedon ochric atau anthropic; dan3. One or more of the following with the upper boundary within 100 cm
of the soil surface: a cambic horizon with a lower depth of 25 cm or more; a cryic temperature regime and a cambic horizon; a calcic, gypsic, petrocalcic, petrogypsic, or salic horizon; or a duripan; or
4. Horison argillic atau natric; atau MEMPUNYAI Horison Salik ; dan
5. Jenuh air pada satu lapisan atau lebih di dalam 100 cm tanah permukaan selama satu bulan atau lebih dalam satu tahun normal; dan
6. A moisture control section that is dry in some or all parts at some time during normal years; and
7. Tidak ada horison sulfurik yang batas-atasnya di dalam 150 cm tanah (mineral) permukaan.
KUNCI TAKSONOMI TANAH: ORDO
Sumber: Keys to Soil Taxonomy, Eighth Edition. 1998. …….. DIUNDUH 15/2/2013
ULTISOLSTanah-tanah lainnya yang mempunyai:Horison argillik atau kandik, tetapi tidak ada fragipan, dan kejenuhan basa (total kation) kurang dari 35 % pada salah satu kedalaman berikut:
If the epipedon has a sandy or sandy-skeletal particle-size class throughout, either:1. 125 cm below the upper boundary of the argillic horizon (but no deeper than 200 cm
below the mineral soil surface) or 180 cm below the mineral soil surface, whichever is deeper; or
2. At a densic, lithic, paralithic, or petroferric contact if shallower; or The shallowest of the following depths:
3. 125 cm below the upper boundary of the argillic or kandic horizon; or4. 180 cm below the mineral soil surface; or5. At a densic, lithic, paralithic, or petroferric contact; or
Fragipan dan dua-hal berikut ini:
1. Either an argillic or a kandic horizon above, within, or below it or clay films 1 mm or more thick in one or more of its subhorizons; and
2. A base saturation (by sum of cations) of less than 35 percent at the shallowest of the following depths:
75 cm below the upper boundary of the fragipan; or200 cm below the mineral soil surface; or 3. At a densic, lithic, paralithic, or petroferric contact.
KUNCI TAKSONOMI TANAH: ORDO
Sumber: Keys to Soil Taxonomy, Eighth Edition. 1998. …….. DIUNDUH 15/2/2013
MOLLISOLSTanah-tanah lainnya yang mempunyai dua hal berikut:
1. Either:1. Epipedon Molik; atau2. Both a surface horizon that meets all the requirements for a mollic
epipedon except thickness after the soil has been mixed to a depth of 18 cm and a subhorizon more than 7.5 cm thick, within the upper part of an argillic, kandic, or natric horizon, that meets the color, organic-carbon content, base saturation, and structure requirements of a mollic epipedon but is separated from the surface horizon by an albic horizon; and
2. Kejenuhan basa 50 % atau lebih (metode NH4OAc) dalam semua horison
yg terletak : di antara batas-atas horison argillic, kandic, atau natrik dan kedalaman 125 cm di bawah batas-atas tersebut; ATAU horison di antara permukaan tanah mineral dan kedalaman 180 cm; ATAU horison-horison di antara permukaan tanah mineral dan kontak-densik, kontak-litik atau kontak paralitik yang paling dangkal.
KUNCI TAKSONOMI TANAH: ORDO
Sumber: Keys to Soil Taxonomy, Eighth Edition. 1998. …….. DIUNDUH 15/2/2013
ALFISOLS
Tanah-tanah lainnya yang tidak mempunyai epipedon plaggen, dan mempunyai:
1. Horison argillik, kandik, atau natrik; atau2. Fragipan yang mempunyai selimut liat tebalnya 1 mm
atau lebih di dalam profilnya.
KUNCI TAKSONOMI TANAH: ORDO
Sumber: Keys to Soil Taxonomy, Eighth Edition. 1998. …….. DIUNDUH 15/2/2013
INCEPTISOLSTanah-tanah lainnya yang mempunyai:Satu atau lebih sifat-sifat berikut:
1. A cambic horizon with its upper boundary within 100 cm of the mineral soil surface and its lower boundary at a depth of 25 cm or more below the mineral soil surface; or
2. A calcic, petrocalcic, gypsic, petrogypsic, or placic horizon or a duripan with an upper boundary within a depth of 100 cm of the mineral soil surface; or
3. A fragipan or an oxic, sombric, or spodic horizon with an upper boundary within 200 cm of the mineral soil surface; or
4. A sulfuric horizon that has its upper boundary within 150 cm of the mineral soil surface; or5. A cryic temperature regime and a cambic horizon; or
Tidak ada material sulfidik di dalam 50 cm permukaan tanah mineral; dan kedua hal berikut:
6. In one or more horizons between 20 and 50 cm below the mineral soil surface, either an n value of 0.7 or less or less than 8 percent clay in the fine-earth fraction; and
7. Satu atau dua hal berikut: 1. Horison salik atau epipedon histic, mollic, plaggen, atau umbrik; atau2. Dalam 50 % atau lebih lapisan-lapisan yg terletak di antara permukaan tanah
mineral dan kedalaman 50 cm, ESP sebesar 15 atau lebih (atau SAR 13 atau lebih), yang menurun nilainya dengan meningkatnya kedalaman di bawah 50 cm, dan juga groundwater di dalam 100 cm permukaan tanah mineral selama beberapa waktu dalam setahun pada saat tanah tidak beku.
Sumber: Keys to Soil Taxonomy, Eighth Edition. 1998. …….. DIUNDUH 15/2/2013
ENTISOLS
Tanah-tanah lainnya.
KUNCI TAKSONOMI TANAH: ORDO
Entisols:
Tanah-tanah yang baru terbentuk1. Permukaan lahan yang snagat muda (alluvium, colluvium,
mudflows)2. Batuan sangat keras3. Bahan induk berpasir4. Material yang terganggu (mis. Lahan tambang, tanah-tanah yg
sangat padat, material toksik)5. Transisi antara 'soils' dan 'not soils'
Sumber:. …….. DIUNDUH 15/2/2013
ALFISOLS
Alfisols develop in humid and subhumid climates, have average annual precipitation of 500-1300 mm. They are frequently under
forest vegetation.
Characteristic features: Clay accumulation in a Bt horizon,
thick E horizon, available water much of the growing season, slightly to moderately acid.
DESKRIPSI RINGKAS ORDO
Alfisols:
High to medium base status soils with argillic horizons1. Most Alfisols are present on relative
old landscapes (beginning Holocene or older) whereever the supply of primary minerals is plentiful
2. They also occur on glacial drift3. A wide variety of clay minerals ® high
cation exchange capacity
Sumber:. …….. DIUNDUH 15/2/2013
DESKRIPSI RINGKAS ORDOALFISOLS
Are found under conditions of mild acid weathering common under broad
leafed forests and savannas. Suborders include Aqualfs (wet),
Cryalfs (cold), Udalfs (humid), Ustalfs (moist/dry), and Xeralfs (dry
summers). About 10% of the land area is classified as Alfisols globally.
Alfisols have an Argillic (high clay) subsurface horizon that is at least
35% saturated with non-acid cations. In general, Alfisols are quite
productive.
When properly managed, limed, and fertilized they rank with Mollisols in
their crop productive capacity.
Sumber:. …….. DIUNDUH 15/2/2013
ANDISOLS
Andisols are soils with over 60 % volcanic ejecta (ash, cinder,
pumice, basalt) with bulk densities below 900 kg/m3.
Characteristic features: Dark A horizon, early-stage secondary minerals (allophane, imogolite,
ferrihydrite clays), high adsorption and immobilization of
phosphorus, very high cation exchange capacitity.
DESKRIPSI RINGKAS ORDO
Andisols:Soils with andic soil properties1. Pyroclastic deposits (volcanic ejecta)
such as ash, pumice, cinders, and lava
2. Characteristic:
3. vitric material or volcanic glass, which are dominated by amorphous, short-range-order minerals
4. low bulk density < 0.9 g/cm3
5. Allophane and imogolite are common early-stage residual weathering products of volcanic glass
Sumber:. …….. DIUNDUH 15/2/2013
DESKRIPSI RINGKAS ORDOANDISOLS
Are developed on recent volcanic ejecta and have been subjected to only mildweathering.
Suborders are divided by temperature and moisture regime as for Inceptisols (Aquands
and so on), plus Torrands (hot, dry) and Vitrands (high in volcanic glass).
Though limited in their extent, Andisols are very productive. They are commonly located at high elevations near the volcanos. Andisols are dark in color, low in density, and are quite
easily managed. Their colloidal fraction is dominated by poorly crystallized minerals such as allophane and
imogolite, giving these soils a high capacity to hold phosphorus in unavailable forms, a
problem surmountable with judicious use of manures and fertilizers.
Sumber:. …….. DIUNDUH 15/2/2013
ARIDISOLSAridisols berkembang di
daerah iklim kering.
Charactersitic features: horizons of lime or gypsum accumulation, salty layers, and/or A and Bt horizons.
DESKRIPSI RINGKAS ORDO
Aridisols
Tanah-tanah dari daerah kering1. Wide variety of parent material:2. Glacial drift3. Crystalline rocks4. Fluvial and eolian deposits
(unconsolidated material)5. Parent material rich in sand-sized
particles6. Gypsiferous material formed from
sedimentary rocks7. Batukapur = Limestone.
Sumber:. …….. DIUNDUH 15/2/2013
DESKRIPSI RINGKAS ORDOARIDISOLS
Are dry soils. They are found globally on about 12% of the land area, and are prominent in the western part of the United States. Seven suborders are recognized, Argids (clay), Calcids (calcium carbonate), Gypsids
(gypsum), Natrids (high sodium, natric horizon), Durids (duripan), Salids (soluble salts) and Cambids (only a cambic horizon with no other diagnostic subsurface
horizons). Most Aridisols are either Argids or Cambids (most Cambids were formerly classified as Orthids).
They support a diversity of desert flora and fauna, and are used to some extent for low-intensity grazing of sheep
and goats, but their productivity is generally low.
When irrigated, however, these soils can be very productive especially if supplementary nutrients are
supplied through manure or chemical fertilizers. In any case, care must be taken not to over exploit these soils.
Sumber:. …….. DIUNDUH 15/2/2013
ENTISOLS
Entisols have no profile development except a shallow marginal A horizon.
Many recent river floodplains, volcanic ash deposits, unconsolidated deposits with horizons eroded away, and sands
are Entisols. Characteristically have A/C or A/R profiles, exhibit only ephemeral soil
development - largely confined to surface horizon. May have an Ap horizon.
Suborders: 1. Aquents - exhibit wetness features 2. Arents - distinctive plow layer 3. Fluvents - formed in alluvial deposists4. Orthents - loamy or clayey textures 5. Psamments - sandy textures
DESKRIPSI RINGKAS ORDO
Llittle if any profile development, include Aquents (wet), Arents (plow induced), Fluvents (alluvial deposits), Orthents (typical), and Psamments (sandy) suborders. They occur under varied environmental conditions, their properties being controlled largely by the parent materials from which they form since minimal soil development has occurred. Their productivity varies greatly, from very fertile alluvial soils (fluvents) to recently deposited sandy (psamments), and shallow rocky soils. Sustainable management practices vary from intensive cropping of alluvial soils to maintenance of natural vegetation on some sandy areas and steep slopes.
Sumber:. …….. DIUNDUH 15/2/2013
DESKRIPSI RINGKAS ORDOENTISOLS
Llittle if any profile development, include Aquents (wet), Arents (plow induced), Fluvents
(alluvial deposits), Orthents (typical), and Psamments (sandy) suborders.
They occur under varied environmental conditions, their properties being controlled
largely by the parent materials from which they form since minimal soil development has
occurred. Their productivity varies greatly, from very
fertile alluvial soils (fluvents) to recently deposited sandy (psamments), and shallow
rocky soils. Sustainable management practices vary from intensive cropping of alluvial soils to maintenance of natural
vegetation on some sandy areas and steep slopes.
Sumber:. …….. DIUNDUH 15/2/2013
GELISOLS
The central concept of Gelisols are soils with gelic materials underlain by
permafrost. Diagnostic horizons may or may not be present. Permafrost
influences pedogenesis by acting as a barrier to the downward movement of
the soil solution. Cryoturbation (frost mixing) is an
important process in many Gelisols and results in irregular or broken horizons,
involutions, organic matter accumulation on the permafrost table, oriented rock
fragments, and silt caps on rock fragments. Cryoturbation occurs when
two freezing fronts, one from the surface and the other from the permafrost,
merge during freeze-back in the autumn.
DESKRIPSI RINGKAS ORDO
Suborders:
1. Histels - histic epipedon2. Turbels - evidence of
cryoturbation 3. Orthels - other Glelisols.
Gley soils
Bahan induk
Glei warna kelabu-biru, terganang
Warna hitan dan humus masam (mor)
Berumput / semak-belukar kecil-kecilAHorizon
BHorizon
CHorizon
Precipitasi > evaporasi
Waterlogged
Silty texture
Impermeable clay
Fragmen batuan Angular
Permafrost
Paku dan Lumut
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DESKRIPSI RINGKAS ORDO
GELISOLS
Are soils with permanently frozen layers (permafrost) in the upper 1 m, or
in the upper 2 m if horizons display cryoturbation. They may have a histic,
umbric, calcic or mollic diagnostic horizon. The three suborders of
Gelisols are Histels (organic material), Turbels (cryoturbation), and Orthels
(no special features).
These soils are found in very cold regions and are therefore of very
limited agricultural significance. They typically support tundra vegetation.
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HISTOSOLS
Histosols are organic soils (peat and mucks) consisting of variable depths of
accumulated plant remains in bogs, marshes, and swamps.
Organic soils, see definition of Histic epipedon for minimum limits on organic
carbon, but note that most Histosols exceed depth requirements for histic
epipedon.
Suborders:1. Folists -leaf mat accumulations above
R horizon2. Fibrists - slight decomposition 3. Hemists - intermediate decomposition4. Saprists - highly decoposed
DESKRIPSI RINGKAS ORDO
Histosols
Organic soils
Organic material (e.g. peats, bogs, wetlands)
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DESKRIPSI RINGKAS ORDOHISTOSOLS
Are organic soils mainly formed in wetland accumulations of plant residues. The four suborders are Fibrist (fibers of plants obvious), Folists (leaf mat accumulations), Hemists (fibers partly decomposed), and Saprists (fibers not recognizable). Even though
they cover only 1% of the earth's land surface, Histosols are found all over the world. They are most extensive in cool and cold climates. They are light in
weight and have high water holding capacities per unit mass. When drained and fertilized they are quite productive, being used extensively for flower and
vegetable production. The peat is also used for containerized plant
production and as a landscaping mulch. The water level in drained Histosols should be maintained as
high as crop production will permit to reduce oxidation of the peat and wind erosion of the soil. Also, some drained Histosols should best be returned to wetland
conditions to provide habitats for wild species.
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INCEPTISOLS
Inceptisols, especially in humid regions, have weak to moderated horizon development. Horizon development have been retarded
because of cold climated, waterloged soils, or lack of time for stronger development.
Characteristic feature: Texture has to be finer than loamy very fine sand.
Characterized by ochric epipedon and incipient B horizon development (Cambic ~
Bw)Suborders:1. Aquepts - exhibit wetness features 2. Anthrepts - anthropic or plaggen epipedon3. Cryepts - cryic soil temp. regime 4. Ustepts - ustic soil moist. regime 5. Xerepts - xeric soil moist. regime 6. Udepts - other Inceptisols (i.e., udic soil
moist. regime)
DESKRIPSI RINGKAS ORDOInceptisols
Embryonic soils with few diagnostic features1. Glacial deposits2. Recent deposits in valleys or
deltas3. Most Inceptisols occur on
geologically young sediments (e.g. alluvium, colluvium, loess)
4. Parent materials which are highly calcareous or resistant to weathering inhibit soil development but favor the development of Inceptisols
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DESKRIPSI RINGKAS ORDOINCEPTISOLS
Have a few diagnostic features, the process of soil formation being in its
early stages. Suborders for Inceptisols, as for most other orders,
include those with very cold temperature regimes (Cryepts), and those with moisture regimes that are
wet (Aquents), humid (Udepts), alternately moist and dry (Ustepts),
and dry in summer but moist in winter (Xerepts).
Inceptisols are about as variable as Entisols and have equally variable
management requirements.
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MOLLISOLS
Mollisols are frequently under grassland, but with some
broadleaf forest-covered soils.
Characteristic features: Deep, dark A horizons, they may
have B horizons and lime accumulation.
DESKRIPSI RINGKAS ORDOMollisols:
Grassland soils of steppes and prairies (base rich soils)1. Deposits and landscapes with a wide
range of ages2. Many Mollisols are formed on deposits
associated with glaciation (unconsolidated quaternary materials) - calcareous rich aolian deposits supported the formation of Mollisols
3. However, in other areas they develop in residuum weathered from sedimentary rocks
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DESKRIPSI RINGKAS ORDO
MOLLISOLS
Dark soils of grasslands, are among the world's most productive, having high
organic matter contents and good physical condition. Suborders include Albolls (albic
horizon), Aquolls (wet), Cryolls (cold), Rendolls (calcareous), Udolls (humid),
Ustolls (moist/dry), and Xerolls (dry summers/moist winter).
Large areas of Mollisolls are found in the Great Plains of the North America, the
steppes of Russia,, and the grasslands of Central Asia and China. Many areas are
intensively used for grain production.
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OXISOLSOxisols are excessively
weathered, whereas few original minerals are left unweathered. They develop only in tropical
and subtropical climates.
Characteristic features: Often Oxisols are over 3 m deep, have low fertility, have dominantely iron and aluminium clays, and
are acid.
DESKRIPSI RINGKAS ORDO
Oxisols:
Low-activity soils1. Highly weathered transported material2. Old fluvial terraces3. On high-lying old erosion surfaces4. The most extensive areas of Oxisols
are in sediments that have been reworked during several erosional and depositional cycles
5. Materials which weather rapidly6. Parent material which consists of
quartz, 1:1 type clays, iron and aluminum oxides
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DESKRIPSI RINGKAS ORDO
OXISOLSAre the most highly weathered of the soil
orders, being most prominent in the humid tropics where rain forest is the dominant
natural vegetation. Six suborders are found: Aquox (wet), Perox (very humid), Torrox (hot/dry), Udox (humid), and Ustox
(moist/dry). They have a deep oxic subsurface horizon dominated by oxides of iron and aluminum. Primary minerals have been essentially all destroyed. Non-sticky low activity clays prevail so the soils are physically well
structured but chemically poor. Their nutrient-supplying power is low and
much of the soil nutrient supply is associated with the organic matter that
occurs in the surface horizons.
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SPODOSOLS
Spodosols merupakan tanah berpasir, tanah-tanah tercuci di
daerah hutan pinus dingin.
Karakteristiknya: Horison O, profil sangat masam,
horison E tercuci, Horison Bh atau Bs akumulasi bahan organik plus oksida besi dan aluminium.
DESKRIPSI RINGKAS ORDO
Spodosols:Tanah-tanah yang subsoilnya menjadi tempat akumulasi humus dan sesquioksida1. Typically, Spodosols are formed in very
coarse silty or coarser (i.e., increase in sand) textured material (e.g. sandy loam, loamy sand, sand)
2. Spodosols occur in late-Pleistocene or Holocene deposits (Ca leached before spodic horizon developed)
3. Siliceous or leached carbonaceous parent materials favor the development of Spodosols
4. Bahan-bahan terlapuk dari batuan miskin Ca dan Mg (mis. sandstone, granite)
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DESKRIPSI RINGKAS ORDO
SPODOSOLSAre extremely acid soils of forested areas in moist
(usually cold) regions where coarse-textured parent materials are present. Spodosols are found in
about 3% of the land area in the United States and globally. The suborders include: Aquods (wet),
Cryods (icy cold), Humods (humus), and Orthods (typical).
Because of their high acidity and coarse texture, these soils are not naturally very fertile. They are poorly buffered, especially in the lower horizons,
and so associated watersheds are quite susceptible to acid rain damage. When heavily fertilized,
however, they can become quite productive as evidenced by the potato growing areas of Maine.
Most are used for coniferous forest production. Where continued crop production is practiced,
excessive applications of chemical fertilizers must be avoided to prevent the buildup of chemicals in
drainage waters to undesirable levels.
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.ULTISOLS
Ultisols are ectensively weathered soils of tropical and subtropical climates.
Characteristic features: Thick A horizon, clay accumulation
in a Bt, strongly acid.
DESKRIPSI RINGKAS ORDO
Ultisols:Low base status soils1. Parent materials which contain few basic
cations such as siliceous crystalline rocks (e.g. granite)
2. Sedimentary material that is relatively poor in bases (e.g. highly weathered coastal plain sediment)
3. Most of geologically old landscapes are covered by parent material rich in silica but poor in bases
4. There are some Ultisols formed in parent material with higher base status and less weathered material (e.g. volcanic ash, basic ignenous or metamorphic rocks):
5. Basic parent material - high precipitation - rapid weathering - rapid leaching of bases.
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DESKRIPSI RINGKAS ORDOULTISOLS
Are highly weathered soils developed under forests in the humid tropics and subtropics. They are more highly weathered and acidic
than Alfisols, but less weathered than Oxisols. Suborders are Aquults (wet), Humults (high humus), Udults (humid), Ustults (moist/dry),
and Xerults (dry summers). They occur on 9% of the land areas in the
worldwide. In tropical areas they are found in association with Oxisols.
Ultisols are not naturally as productive as Mollisols or Alfisols, but when properly fertilized
and managed they produce well.
The clays present in Ultisols are mostly of the non-sticky low activity type which helps assure
easy workability of these soils in the field.
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VERTISOLSVertisols exist most in temperate to tropical climated with distinct wet and dry seasons. They have a high content of clays that swell when wetted and show cracks when dry. Characteristic features: Deep self-mixed A horizon , top soil falls into cracks seasonally, gradually mixing the
soil to the depth of the cracking.Mineral soils that (i) are over 50cm thick, (ii) have more than 30% clay in all horizons, and (iii) have cracks at
least 1 cm wide to depth of 50 cm at some time in most years (unless irrigated). Conditions that give rise to
Vertisols are: (i) parent materials that are high in, or that weather to form, large amounts of 2:1 expanding clay
and (ii) occur in a climate with a pronounced wet and dry season - sufficient to promote cracking.
Suborders:1. Torrerts - see Aridic-type moisture regime2. Uderts - see Udic moisture regime 3. Usterts - see Ustic moisture regime 4. Xererts - see Xeric moisture regime 5. Cryerts - see Cryic temperature regime
DESKRIPSI RINGKAS ORDOVertisols:
Shrinking and swelling dark clay soils1. Wide range of parent material including
alluvial, colluvial and lacustrine deposits2. Marl and other calcareaous rocks,
limestone, shales, igneous, metamorphic and volcanic rocks of basic nature
3. Unconsolidated sediments which are dominantely basic in character and low in quartz
4. The parent material although variable in origin, are rich in feldspars and ferro-magnesian minerals and yield clay residues on weathering
5. Vertisols may develop in situ from the parent materials. The smectites in these soils could be derived from the original rock or form as a result of neogenesis or transformations from primary minerals.
6. Characteristics: high clay content (predominance of 2:1 type expanding clay -> montmorillonite, smectite)
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DESKRIPSI RINGKAS ORDOVERTISOLS
Are characterized by high levels of swelling-type clays. Suborders include Aquerts (wet),
Cryerts (cold), Torrerts (hot/dry), Uderts (humid), Usterts (moist/dry), and Xererts (very
dry).
Vertisols are sticky and plastic when wet, and hard and cloddy when dry. This complicates their proper management especially by poor
farmers with little or no access to power equipment to handle these heavy soils.
Despite their limitations, Vertisols are widely tilled. However if conservation practices and mechanized equipment are not available to till
the soil promptly at just the right moisture content, yields can be low and the soils are
subject to severe erosion if the land is sloping.
DIAGRAM DERAJAT PERKEMBANGAN TANAH
Sumber: Keys to Soil Taxonomy, Eighth Edition. 1998. …….. DIUNDUH 15/2/2013
KUNCI ORDO TANAH
Sumber: Keys to Soil Taxonomy, Eighth Edition. 1998. …….. DIUNDUH 15/2/2013
UNSUR PEMBENTUK ORDO
Sumber: Keys to Soil Taxonomy, Eighth Edition. 1998. …….. DIUNDUH 15/2/2013
Ordo Tanah Derivasi Unsur Pembentukan
Alfisols alf.Andisols Ando = tanah hitam and.Aridisols aridus = kering id.Entisols ent.Gelisols gelid = sangat dingin el.Histosols histos = jaringan ist.Inceptisols Inceptum = mulai, awal ept.Mollisols Mollis = lunak oll.Oxisols Oxide = oksida ox.Spodosols Spodos = abu kayu od.Ultisols Ultimus = akhir ult.Vertisols Verto = membalik ert.
UNSUR FORMATIFUnsur Formatif Konotasi unsur formatifalb Adanya horison albik (horison eluvial yang tercuci)anthr Adanya epipedon anthropik atau epipedon plaggenaqu Karakteristik yang berhubungan dnegan kebasahanar Horison tercampur / campuranarg Adanya horisom argilik (horison dnegan liat iluvial)calc Adanya horison kalsikcamb Adanya horison kambikCry DinginClur Adanya duripanfibr Fase dekomposisi ringan / awalfluv Dataran banjirfol Massa dedaunangyps Adanya horiosn gipsikhem Fase dekompoisisi intermedier
UNSUR FORMATIFUnsur Formatif Konotasi unsur formatifHist Adanya epipedon HistikHum Adanya bahan organikorth Paling lazimper Iklim humid sepanjang tahun, rezim air perudikpsamm Tekstur pasirrend Rendzinalike – kaya karbonatsal Adanya horison salik (saline)sapr Fase dekomposisi lanjuttorr Biasanya keringturb Cryoturbasiud Iklim humidust Iklim kering, biasanya panas selama summervitr Menyerupai gelasxer Sumer kering, winter lembab
Sumber: foto.smno.saradan.htjati.nop2012
Kondisi Tanah di hutan jati pada musim kemarau
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