如何计算Soil Erosion
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Soil erosion rates depend on slope, rainfall, vegetation cover, and soil properties. Excessive erosion reduces productivity and causes sedimentation.
公式
R = rainfall erosivity, K = soil erodibility, L/S = slope factors, C = cover, P = practice factors
- R
- rainfall erosivity — rainfall erosivity
- K
- soil erodibility — soil erodibility
- L
- slope factors — slope factors
- S
- slope factors — slope factors
- C
- cover — cover
- P
- practice factors — practice factors
分步指南
- 1Universal Soil Loss Equation (USLE): A = R × K × L × S × C × P
- 2R = rainfall erosivity, K = soil erodibility, L/S = slope factors, C = cover, P = practice factors
- 3Units: tonnes/hectare/year; 0.5-10 typical; >5 considered excessive
例题解析
输入
Bare slope, R=100, K=0.5, LS=2, C=1, P=1
结果
A = 100 tonnes/ha/year (severe erosion)
Vegetation urgently needed
常见错误注意事项
- ✕Ignoring erosion impact until productivity loss evident
- ✕Assuming grade alone predicts erosion (vegetation crucial)
常见问题
How does vegetation prevent erosion?
Roots bind soil, canopy reduces raindrop impact, litter protects surface. 90%+ cover reduces erosion dramatically.
Is soil erosion always bad?
Slight erosion natural, but excessive causes loss of fertile topsoil, sedimentation, and productivity decline.
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