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11 Cards in this Set
- Front
- Back
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Movement of soil occurs in 3 stages |
- detachment - movement - deposition |
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Types of Water Erosion |
- sheet - rill - gullies - streambank
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Erosion damage |
- soil loss - texture change - plant nutrients are removed - soil is less compact, less fertile - soil is less permeable - yields are reduced |
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Structural Damage |
- loss of surface soil results in coarser material overall - raindrops disintegrate aggregates on the soil surface initiating crust formation - surface becomes compacted - soils that experience significant crusting also experience greater amounts of erosion |
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water erosion: two causes |
- falling raindrops - running water |
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Features of slope that effect erosiveness |
- slope gradient - slope length - slope shape |
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sand |
- can be deposited from fast-moving streams |
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silt |
- will settle out in quantities only as the stream's gradient levels off |
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clay |
settles out in significant quantities only when the water is still or when the clay flocculates as the stream enters a body of salt water |
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Erodibility affected by the following properties |
- soil structure - soil detachability - permeability - organic matter - transportability |
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Principles to reduce erosion |
- reduce raindrop impact on the soil - reduce runoff volume and velocity - increase the soil's resistance to erosion |
