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Effect of Vegetation Destruction on Soil Fertility Development

Bai Hongying (Department of Resources and Environmental Science,Northwestern Agricultural University,Yangling,Shaanxi 712100)Tang Guoli (Bureau of Farm Machinery, Pinggu County,Beijing 101200)  
The effect of accelerated erosion on soil sustainable function is researched in this paper,using field investigation and analytic data.The result shows that accelerated erosion destroys region soil and the soil loss of surface layer is 0.6~1.2 cm/a .Compared with forest land,the waterstable aggregate content in cultivated land (after 7 years and 20 years of reclaimation) decreases by 40%-89%,thus resulting in the imbalance of water,air and heat and the breakdown of eco environmental system in soil.To all these adversities,measures for sustainable development are proposed.
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