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Soils, Soil Processes & Decomposition

Soils, Soil Processes & Decomposition. Surface area increases as particle size decreases. Surface area influences ability to hold water and nutrients. Soil formation processes – Laterization Silicate rich parent material

hiram-williams
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Soils, Soil Processes & Decomposition

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  1. Soils, Soil Processes & Decomposition

  2. Surface area increases as particle size decreases.Surface area influences ability to hold water and nutrients.

  3. Soil formation processes – Laterization Silicate rich parent material Free polyphenols disperse clays & assist movement f/A->B Older, more intense weathering Rapid decomposition of organics Clays weather to Al and Fe oxides - SiO4 goneRed or Yellow color Infertile, rapid and almost direct recycling; little nutrient storage

  4. Entisols Udipsamment

  5. Entisols Eudifluvent Lithic Ustorthent

  6. Inceptisols Typic Hydrandept Umbric Vitandrept

  7. Alfisols Typic Hapudalf

  8. Ultisols Typic Hapudult

  9. Oxisols Tropeptic Eutrorthox

  10. Soil formation processes – Podsolization Substrate usually well-drained quartz sand, acid, igneous Transport of Fe and Al by soluble organic compounds. Plants from low N or low P soils produce polyphenols E = intense eluviationB = illuviation of organic, Al, & Fe Distribution world-wide, greatest in boreal zoneAlso in temperate and tropical zones on acid quartz sands End point = acid, low nutrients     Bleached E and Dark B with Organics, Fe and Al in B

  11. Spodisols Typic Haplorthod Aeric Haplaquod

  12. Soil formation processes – Calcification Drier sites; Calcium not leached out of soil profile Gradient of decreasing precipitation matches thinner A horizon A horizon high in organic content, mostly roots of grass Often highly fertile Climate/disturbance appears unsuitable for trees

  13. Molliosols Typic Haplaquol Typic Argiudoll

  14. Typic Argiustol Typic Haplustol

  15. Aridisols Typic Haplargid Petrocalcic Paleargid

  16. Typic Salorthid

  17. Histisols Limnic Medisaprist

  18. Vertisols

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