STUDY ON THE RELATIONSHIP BETWEEN DISPOSITION MODELS OF FOREST AND GRASS AND SOIL PROPERTIES IN KARST ROCKY DESERTIFICATION AREAS OF SOUTHWEST CHINA

摘要

Rocky desertification is the most serious ecological and environmental problem in karst areas of Southwest China. Based on the monitoring and analysis of soil physical and chemical properties of different forest and grass disposition models in typical potential-light karst rocky desertification demonstration area, it was concluded that: there were some differences in soil physical and chemical properties of different forest and grass disposition model, but they were generally developing in a positive direction, and the improvement of forest and grass disposition model on soil properties was better than that of each control group; the improvement of forest and grass disposition models on soil physical properties was better than that of pure forest land, the improvement of chemical properties was not significant, so it was necessary to supplement soil nutrients according to the soil quality of each model; the difference of the improvement effect of different models determined the heterogeneity of utilization purpose, and all models could improve the physical and chemical properties of soil over time.