Karst Dissolution Rates of Areas with Different Vegetation Types in the Sub-mountain Region
亚高山不同植被类型区的雨季岩溶溶蚀速率研究

Previous studies of karst processes were mainly focused on summarizing the driving effect of CO2 density change on the karst process in a certain karst area.Nevertheless,the direction and intensity of the karst process could be deeply affected by soil physical and chemical variations resulting from land cover.Using the method of standard limestone tablets,the authors detected the corrosional ratios and average corrosional rates of four different vegetation types on the basis of the observation of karst districts of Bitan and Shuifang springs in the Jinfo Mountain in the summer of 2006.Almost all the vegetation types occurred in a small study area,so the present study was typical and representative.The results show that the corrosional ratios of different vegetation types at different elevations are quite different.In general,the corrosional ratios increase gradually from the forest land of Shuifang spring,through the bamboo forest land of Shuifang,the meadow of Shuifang and the forest of Bitan spring,to the shrub of Bitan spring.On the basis of rainfall and temperature differences in the two springs,it is concluded that,besides soil CO2,soil organism is one of the major factors controlling the karst dissolution rate in these districts.