Comparative Study About Erosion Resistance Ability In Typical Karst Region

From the present situation and progress of the research at home and abroad.Soil erosion situation research is one of the key aspects of soil erosion.The choice of the ways of land use is an effective way which can control water and soil loss.This paper through the method runoff plots in 2008-2009,testing out the soil fertility index and Soil erosion modulus in six kinds of land use patterns of six test points. the soil fertility difference of the study area under the different land USES is big. Although the content of the three main nutrient elements sorting are different,but all of them have different degrees of relevancy with content of soil organic matter. The soil nitrogen con tent of the six runoff pool silt in the different land USES of study area under is high.soil total nitrogen content and hydrolysis nitrogen content of 6 kinds of methods of land use from high to low tier:Cultivated land> woodland> garden> farmland> badlands> Honeysuckle land. Soil nitrogen content is associated with distribution of organic matter content. Soil phosphorus content is high in the different land ways of study area. The correlation of Soil phosphorus content and soil organic matter congtent is lower than correlation of soil nitrogen content and organic matter content,the association of rapidly-available potassium and soil organic matter content was not significant, explain the organic matter content had no influence on the content of the soil for soil k.Test results shows that the soil erosion modulus of different land USES and soil fertility of different land ways have very big difference in karst region.Specific conclusions are as follows:soil erosion modulus of natural plot is less than soil erosion modulus of farmland.The karst slot valley area have certain control effect on soil erosion.When using the natural plot for production in karst slot valley area.it can play better prevent soil erosion effect according to its terrain with simple engineering measures,descrtification engineering also can play a good project to prevent soil erosion effect,and over time, the effect become increasingly good.