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Soil erosion rates depend on slope, rainfall, vegetation cover, and soil properties. Excessive erosion reduces productivity and causes sedimentation.

Formel

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

Trin-for-trin guide

  1. 1Universal Soil Loss Equation (USLE): A = R × K × L × S × C × P
  2. 2R = rainfall erosivity, K = soil erodibility, L/S = slope factors, C = cover, P = practice factors
  3. 3Units: tonnes/hectare/year; 0.5-10 typical; >5 considered excessive

Løste eksempler

Input
Bare slope, R=100, K=0.5, LS=2, C=1, P=1
Resultat
A = 100 tonnes/ha/year (severe erosion)
Vegetation urgently needed

Almindelige fejl at undgå

  • Ignoring erosion impact until productivity loss evident
  • Assuming grade alone predicts erosion (vegetation crucial)

Ofte stillede spørgsmål

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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