EAE1022 Lecture Notes - Lecture 19: Soil Horizon, Biotic Material, Soil Ph

• School: Monash University
• Department: Science - Atmospheric Science
• Course: EAE1022
• Professor: Marion Anderson

Document Summary

Eae1022 lecture 19 - earth, atmosphere and environment. How does soil form: previously, soil is made up of air, water, organic materials (living and non-living) and inorganic materials (sand, silt, clay) 4 soil forming processes. Je(cid:374)(cid:374)y(cid:859)s fu(cid:374)da(cid:373)e(cid:374)tal soil e(cid:395)uatio(cid:374): s = f(cid:894)cl, o, (cid:396), p, t (cid:895) Parent material: bedrock, transported material, alluvial/fluvial sediments (deposited by water ie. riverine processes, colluvial sediments (deposited by gravity ie. hillslope processes, aeolian sediments (deposited by air ie. sediments deposited by wind, lacustrine sediments (lake sediments) Glacial or periglacial sediments: organic materials, bedrock, sedimentary (eg. sandstone and limestone) Alluvial deposits: alluvial plains eg. floodplains, alluvial fans and delta deposits, colluvial deposits. Frequently coarse and stony eg. talus slopes, footslopes: aeolian deposits, sand, loess (silt), parna (clay), volcanic ash, transported material: glacial deposits (formed on glacial till) Soils formed on organic deposits: swamps, wetlands. Lo(cid:449) (cid:396)ai(cid:374)fall less leachi(cid:374)g alkali(cid:374)e soils: high (cid:396)ai(cid:374)fall (cid:373)o(cid:396)e leachi(cid:374)g acidic soils.