Soil Restrictive Factors Analysis and Countermeasures in Guizhou Karst Region

Karst is one of the weakest kind of ecological environments and one of the main factors that restrict economic development in south-west China,especially in Guizhou province.Karst accounts for 73.6% of total land area.Although many researches on karst environment have been done,there is little study on the soil quality.Therefore,this paper first expounds the basic features of karst eco-environmental fragilities in Guizhou,its causes and mechanism of soil restrictive factors,then puts forward the main countermeasures,which should be the application of efficient lime,adjusting plant structure,planting green manure and the control of soil and water losses.There are important meanings for the west development and de-farming and reafforestation in Karst region according to the requirements of eco-environment construction in western China.