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Soils_2 - Soil erosion rates depend on Soil...

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Soil erosion rates depend on: Soil properties (engineering properties) strength (cohesion) erodibility (determined by texture, strength, soil moisture) Land use (including vegetation cover) Topography (slope and length of hillside) Climate (rainfall and percentage of runoff) Estimated average loss for US croplands: 5 tons/acre/year Rates of soil formation depend on: Same factors governing soil development Estimated by thickness of soil and years of formation Average gain: 1-4 tons/acre/year Soil is a diminishing resource
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Soil thickness 100 cm Years to form 10,000 yr = 0.01 cm/yr Can we estimate the rate of soil formation for Long Island soils? Typical thickness of soil: 100 cm Years soil has been forming: 10,000 yr
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Land use and soil erosion Soil erosion measured by sediment yield to streams
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Land use and soil erosion Agriculture Large areas of land used Long duration of activity Fertile “topsoil” lost first