The Simulation of Controlling the Soil and Water Loss in Dalian City

In order to control the soil and water loss of Dalian City and in combination with the overall situation of land surface of the city,the authors simulated the influence of soil organic matter,distance of soil loss,cover type of land and percentage of coverage,etc.on soil and water loss.The simulation was based on the Soil Erosion Generic Equation and Lagrange Median Theorem.Both the theoretical economic points and the theoretical sensitive points were calculated for different land surface conditions,and the influence of various surface acting factors on the control of soil and water loss quantitatively analyzed.The results show that the most important factor that influences the soil and water loss is the content of soil organic matter,followed by percentage of coverage,cover type of land and the distance of soil loss in order.The basic land surface conditions of controlling soil and water loss should be at least 1.78% of content of soil organic matter,(3 603) m of controlling distance,the grass land being the primary type of coverage,and the percentage of coverage higher than 41%.According to the simulated results,the authors put forward some countermeasures to scientifically control the soil and water loss in Dalian City.