Study on the Relationship between Soil and Water Conservation Measures and Soil Erosion Amount Based on WEPP Model
Soil and water conservation measures can effectively reduce sediment amount,which is an important influence factor in the process of soil erosion.Based on the observation data of science and technology in demonstration garden of soil and water conservation of Yanqing County,Beijing,the amount of soil erosion under different soil and water conservation measures was simulated with WEPP model.The results showed that:(1) there was a logarithmic relationship between vegetation coverage and soil erosion amount.The higher the vegetation coverage,the less the amount of soil erosion.When the vegetation coverage was more than 50％,the soil erosion amount decreased significantly,and the threshold value of vegetation coverage was 70％;(2) the soil erosion process mainly occurred at the ridge of terrace,and there was little water and soil loss in the horizontal field.Soil erosion amount was positively correlated with ridge height and negatively correlated with width of horizontal field.In the northern rocky mountainous area,the ridge height of terrace should not be more than 2.5 m and the field width should not be less than 5 m;(3) crop-grass intercropping effectively reduced soil erosion,and the erosion reduction effect was better with a greater ratio of grass to crop.On slope cropland for soil and water conservation,the optimal configuration ratio of crop to grass was 2 m:4 m.The results provided significant references for the study of soil erosion and configuration of soil and water conservation measures in the northern rocky mountainous area of China.
Soil erosionSoil and water conservation measuresWEPP model
NETL
NSTL
万方数据
维普
