The Environmental Effect of Soil Erosion and Element Runoff in the Songhua Lake Valley

摘要

Under the condition of the different precipitation intensity, different gradient, different land use and different vegetation coverage, the soil erosion and transference of element (or pollutant) are researched by simulating and sample analyzing for the experimental-district of the surface runoff in the catchment area which is about 43,370.8km~2. And the influencing factor that produces the spatial difference is analyzed and assessed. It's put forward that the irrational utilization of land is the reason of soil erosion and pollutant runoff. The gradient of agro-land, the growth period of vegetation and the vegetation coverage are the chiefly restricted factors which lead to the soil erosion and pollutant runoff. Our study provides the fundamental data for comprehensively planning and mainly harnessing of the non-point source pollution in the valley.