PERKEMBANGAN HORISON TANAH

PERKEMBANGAN HORISON TANAH


• A-Horizon development– Accumulation of organic matter– Clumping of individual soil particles– Distinct from parent material and other layers

• B and C horizon development– Carbonic and organic acids are carried by water into soil where

dissolve various minerals (transformations)– Soluble materials (ions –Ca2+, CO32-, SO42-, etc) are carried by water

and precipitate in the soil from upper to lower horizons (translocation)

– Weathering of primary minerals into secondary minerals– Wetting and drying cracks soils and makes structures.

DIUNDUH DARI: myspace.aamu.edu/users/monday.../soils/Pedogenic%20Processes.ppt ….. 11/2/2013

DIUNDUH DARI: myspace.aamu.edu/users/monday.../soils/Pedogenic%20Processes.ppt ….. 11/2/2013


PROSES – PROSES GENESIS TANAH

DIUNDUH DARI: ……. 17/2/2013

Adsorption – Adsorpsi - Penjerapan: Proses ini terjadi kalau gaya-gaya tarik antara permukaan padatan-tanah

(adsorbent) dan komponen larutan-tanah (adsorbat ) lebih besar dibandingkan gaya-gaya tarik antara komponen terlarut dan larutan tanah (solvent), serta gaya

tolak antara permukaan tanah dan spesies yang dijerap.



Aggregation - Agregasi: Partikel-partikel diikat (dipegang) bersama menjadi unit-unit yang ukurannya

beragam, bentuknya bebreda-beda, dengan bvantuan proses-proses fisika, kimiawi dan biologis.

Suatu Agregat dipisahkan dari agregat lainnya melalui bidang permukaan yang lemah.



Alkalization - Alkalisasi: Akumulasi kation Na; pembentukan Horison natrik..

Audification - Pengasaman: Akumulasi ion-ion H+.

Carbonation – Karbonasi (calcification): Akumulasi kalsium karbonat; pembentukan Horison Kalsik atau

Horison Petrokalsik.

Chelation- Khelasi – Peng-khelat-an: Pembentukan senyawa kompleks logam dengan agen organik. Logal dijebak dalam struktur cincin, sehingga menjadi sangat

stabil.



Compaction – Kompaksi - Pemadatan: Reduksi fisik kandungan uadar tanah yang mengakibatkan meningkatnya Bobot Isi.

Cryoturbation: Pencampiran tanah akibat dari suhu rendah, mis. Untuk merusak horison, memasukkan

bahan organik ke dalam horison bawah, dan untuk menata batu-batu.

Dealkalization (solodization): Pergerakan ion Na ke luar dari bagian tertentu profil tanah.

Decarbonation (decalcification): Pergerakan kalsium karbonat ke luar dari bagian tertentu profil tanah.



Decomposition - Dekomposisi: Penghancuran bahan mineral dan bahan organik secara biokimiawi.

Dehydration - Dehidrasi: Kehilangan air yang mengakibatkan suatu senyawa kembali ke keadaan orisinalnya.

Deposition merupakan sedimentasi bahan yang terangkut:1. Akumulasi partikel tanah / colluvium2. Akumulasi unsur hara / Peningkatan KTK3. Pengkayaan partikel berukuran medium.

PROSES – PROSES GENESIS TANAHDesalinization - Desalinisasi:

Pergerakan garam-garam larut ke luar dari bagian tertentu profil tanah.

Desilication - Desilikasi: Pergerakan silika ke luar dari bagian tertentu profil tanah.

Diffusion (into and out of the soil): Pertukaran udara antara atmosfir dan tanah karena pengaruh tekanan

partial gerakan massa.

Disaggregation - Disagregasi: Hancurnya agregat atanah.

Dispersion - Dispersi: Proses hancurnya struktur tanah dalam air dan memisah menjadi

separat komponen-komponennya.


Eluviation - Eluviasi: Gerakan material ke luar dari lapisan profil tanah (secara harfiah “pencucian material”); menghilangnya material yang tercuci ke luar (misalnya sequioxides, mineral liat, bahan organik tanah)

Energy influx / outflux: Radiation absorption / reflection:1. Temperatur Tanah2. Microbiological activity -> humification , decomposition,

mineralization3. Evaporasi4. Air tanah



Erosi adalah pengangkutan partikel tanah (dan bahan organik tanah) oleh air atau angin.

1. Pukulan tetes air hujan menghancurkan agregat tanah2. Soil movement / removal of the A horizon3. Smoothing or levelling of the soil surface4. Loss of nutrients / decrease of CEC 5. Selective particle transport results in the relative

enrichment of coarse and fine particles and depletion of medium-sized particles

6. Reduced infiltration / increase in surface runoff / reduced soil moisture

7. Penyumbatan permukaan tanah.



Ferrugination: Development of brown, reddish brown, and reddish soil colors.

Flocculation: It is a process where the individual particles of clay are coagulated to form

floccular aggregates.

Gleization: It involves the reduction of iron and its segregation into redoximorphic features,

or its removal by leaching form the gleyed horizon; process occuring in poorly drained soil.

Humification - Humifikasi: Pembentukan HUMUS dari bahan organik segar.

Hydration: Absorption of water to form a new compound which differs only slightly from

the original state

1. Describes the addition of organic matter to, and its chemical decomposition into humus and organic acids

2. HUMUS is the dark material that makes soils black or brown

3. Breakdown of the humus and organic acids also produces high CO2 concentrations in the soil, leading to carbonic acid and another form of chemical weathering.

Humification

DIUNDUH DARI: smu.edu/earthsciences/academics/courses/geol3472/Lecture%202.ppt ……. 10/2/2013



Hydrolysis: The replacement of cations in a mineral structure .by hydrogen ions from the soil solution.

Illuviation: Movement of material into a section of the soil profile (literally washing into or towards); accumulation of

material washed into (e.g. sequioxides, clay minerals, organic material)

Induration: Hardening of a section of the profile produced in association with iron pans and plinthite, and with other

cementing agents (Si or Ca).Infiltration: The entry of water into the soil surface

Rainwater infiltrates in the soil with soluble and suspended matter.



Interflow (Subsurface flow, through flow, seepage): Lateral subsurface flow.

Lessivage: Physical downward movement of clay minerals.Leucinization (decoloration): Lightening the color in a section of the

profile - formation of an albic horizon.Melanization: Darkening the color of light-colored mineral initial unconsolidated material by mixture and accumulation of organic

matter; formation of a mollic horizon due to incorporation of organic matter.

Mineralization: Release of minerals in various forms during the decomposition of organic matter.

Neutralization: Counteraction of the H+ ions.Outflow: Loss of water from the pedosphere to the groundwater. Loss of water and soluble and suspended matter from the system, i.e. loss

from the soil zone (unsaturated and saturated zone) into the groundwater.

Lessivage1. Physical transport of clay-sized material downward from

surface horizon (Translocation)

2. Leads to reddish coloration and clay-rich subsurface horizons

3. Seasonally wet climates

Modern California Argentina, 225 Million Year old rocksDIUNDUH DARI: smu.edu/earthsciences/academics/courses/geol3472/Lecture%202.ppt ……. 10/2/2013



Oxidation-Oksidasi: Formation of an oxide or the release of electrons.

Pedoturbation: The churning and disruption of horizon formation by biological, physical and to some extent chemical activity, such as wetting and drying, swelling and contraction,

freezing and thawing, root pressures, animal burrowing, acitivty of man.

Podzolization - PODSOLISASI: Proses translokasi SESQUIOKSIDA dalam profil tanah. Bentuk besi ferro larut berada pada zone eluviation, dan besi ferri tidak larut

pada zone illuviation. Podsolisasi adalah proses pembentukan tanah yang menghasilkan tanah Podsol.



Precipitation: Separation and deposition of a substance in a solid form from a solution.

Reduction: Loss of oxygen ions or acceptance of electrons.

Salinization: Accumulation of soluble salts such as chlorides and sulphates of Ca, Mg, Na, or K.

Silication: Accumulation of silica.

Solifluction: Slow flow of saturated soil on a permanent frozen soil (permafrost table).

Solution: Dissolving of minerals into solution (e.g. calcium carbonate into bicarbonate).

Surface crusting (soil sealing): A process which results in the formation of soil crusts on the soil surface, ranging in thickness from a few mm to perhaps as much as 3 cm, that is much mor compact, hard and brittle, when dry, than the material immediately beneath.

Surface runoff (overland flow): Discharge of rainwater over the surface of the land. Surface runoff is composed of unconcentrated

and concentrated flow.


Suspension: The floating of dispersed particles in a medium like water. It is one of the states of particle

transport of eroded sediments, especially for the smaller and lighter particles such as clay.

Synthesis: The biochemical formation of a new compound by combination of elements or

constituents.


Upward movement – PERGERAKAN KE ATAS: Movement of dissolved or suspended matter by

capillarity.

Weathering - PELAPUKAN: All physical and chemical changes produced in rocks, at

or near the earth's surface, by atmospheric agents.


PERKEMBANGAN HORISON TANAH

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