Correlation analysis between rocky desertification and slope degree in karst area of Shaodong county

The nature of rocky desertification in the karst area is a process of the soil erosion leading to the degradation of land productivity,while the magnitude of slope degree fluctuation affects the intensity of soil erosion.For the problem of rocky desertification in karst area of Shaodong County is quite serious,to further understand the correlation that between slope degree and the distribution of land rocky desertification in karst area,two maps of slope degree and rocky desertification distribution were constructed by using some relevant survey information and research data.And they were overlapped and analyzed in order to discuss the correlation between slope degree and rocky desertification,which was supported by GIS technology.The results show that slope degrees of Shaodong County mainly concentrated between the slope area(16°～25°) and steep slope area(26°～35°),steep slope area is the most concentrated area where the different level of rocky desertification distribution;The incidence of rocky-desertification increased mainly as the slope increased where slope degree is less than 25°,but the trend toward the extremely severe rocky desertification is growing rapidly where slope degree is greater than 25°,which belongs to steep slope area.Therefore,intensified soil erosion caused by the slope increases is an important reason for the formation of rocky desertification.The findings provide a basis of rocky desertification control and decision-making for the local authorities.