L16_Soils_web

L16_Soils_web - Soils What is Soil? Soil Properties Soil...

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1 1 Soils What is Soil? Soil Properties Soil Formation Factors Soil Classification 2 What is Soil? A natural surface layer that contains living matter and can support plants consists of matter in all three states: solid, liquid, gas ± solids: ² ² Humus: finely divided, partially decomposed organic matter in soils (dark in colour) ± liquids: ² water ² dissolved substances in water (e.g. nutrients) ± gases: ² air ² gases (e.g. methane, CO 2 , N 2 O, some O 2 ) 3 Soil Profiles Pedon Horizons O A Ae B C R 4 Soil Horizons Organic Layer Solum
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2 5 Colour - indicates composition of soil Texture - size distribution of particles (sand, silt, clay) Structure peds ± Consistence Porosity Soil Moisture Soil Properties 6 Field Capacity - water held in soil after gravity has drained it Wilting Point - water storage level below
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This note was uploaded on 04/02/2011 for the course GEOG 102 taught by Professor Dr.merrinmacrae during the Winter '10 term at Waterloo.

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L16_Soils_web - Soils What is Soil? Soil Properties Soil...

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