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《Journal of Anhui Agricultural Sciences》 2008-09
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Effects of the Vegetation Degradation in Vulnerable Karst Ecological Region in Guizhou Province on Soil Quality and Its Ecological Environmental Evaluation

DAI Li-hong et al(Institute of Agro-environmental Protection,Ministry of Agriculture,Tianjin 300191)  
[Objective] The research aimed to discuss the changes of soil quality in the degeneration process of vegetation system and its effects on the ecological environment.[Method] According to the different vegetation degradation degree in Karst region of Huajiang in Guizhou province,samples were collected from 3 types of land including forest,shrub and waste grassland.The suitable soil quality index were screened out and its effects on the ecological environment was evaluated.[Result] With the vegetation degradation in Karst region,pH value,the nutrient contents of organic matter,N,P and K were decreased to different extent,soil capillary porosity was reduced,soil bulk density was increased,water content in soil was gradually decreased and the soil environment evolved towards the directions of drought and leanness.Such indexes as soil organic matter,the nutrients of available N,P and K,the physical properties of soil in the evolvement process of vegetations in Karst were used to evaluate the effect degree of soil quality degradation on the ecological environment.The results of clustering analysis showed that the effects on the ecological environment were approximately classified into 3 grades.[Conclusion] The higher the vegetation degree was and the more serious the degradation of soil quality was,the more obvious the effects on the ecological environment were.
【Fund】: 农业部环境保护科研监测所基本科研业务费专项资助(2007-AEPI-9)
【CateGory Index】: X826
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