Functions of Soil in the Ecosystem

Functions of Soil in the Ecosystem - • Soil stores water...

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1 1 Functions of Soils in the Ecosystem SS 121 Moody 2 Objective • Introduce the ecological functions of soils – Medium for plant growth – Supply and purify water • Soils in the hydrologic cycle – Cycle organic matter and nutrients – Habitat for many organisms – Engineering medium, manipulation (human ecology) 3 Soils = medium for plant growth • Plants are primary producers – Autotrophs, by photosynthesis • Crops •Fo res ts • Grasslands • Shrub lands • Wetlands 4 Soils give plants… • Physical support • Water •A i r • Moderate temperatures • Protection • Nutrients… 5 What nutrients? • 18 plant-essential nutrients are C . B . HOPK i NS CaFe Co . Cl osed M o n day Mo rning and Ni ght C u Z oo n , the Mg ment 6
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Unformatted text preview: • Soil stores water • Soil conducts water to aquifers • Soil provides water to plants • Most soils are above the water table, unsaturated 2 • Some intersect water table 8 Soils - Cycle organic matter and nutrients • Organic matter Æ Humus, CO 2 , water, nutrients, energy • Minerals Æ nutrients, new minerals, CO 2 • Toxic materials Æ benign or less toxic – “bioremediation” 9 Soils - Habitat for many organisms • Plants (roots, seeds, rhizomes, bulbs, etc.) • Animals • Microorganisms • Soil provides substrate, air, water, nutrients 10 Animals in soil 11 Soils - Engineering medium, subject to manipulation • Soil can be manipulated, moved • Soils as building materials 12 Large and small scale engineering...
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This note was uploaded on 04/03/2008 for the course SS 121 taught by Professor Staff during the Winter '07 term at Cal Poly.

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Functions of Soil in the Ecosystem - • Soil stores water...

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