Causes and mechanism of eco-environmental fragility and their countermeasures in karst mountain region of southwest, china ——Taking Guizhou province as an example

摘要

Guizhou. Guanxi and Yunnan province are located in Southwest China where karst landforms are well-developed and the outcropped area of carbonate rock sums up 54 * 10~4km~2, It is the largest one of three continuous distributing areas of carbonate rock in the world. According to determination, about 73% of Guizhou's total area and more than 40% of the other's (Guanxi and Yunnan) are also covered by carbonate rock and the contradiction between population and farmland is sharp and its Eco-environments is very fragile, in fact, some features of karst environment of Guizhou have to a great extent affected its social and economic development, Obviously, it is necessary for sustainable development of Guizhou province to realize fragile characteristics and their forming mechanism of karst environment correctly and to put forward corresponding countermeasures.