Effect of different vegetation restoration on soil nutrientchanges in Southern Ningxia mountain region

Based on field investigation and indoor analysis, we studied the effect of different vegetation restoration on soil nutrients in southern Ningxia mountain region. The result showed that: recovering vegetation can improve remarkably the content of soil organic matter and available N，K e tc.，and drop soil pH， enhence the conservative capability of soil nutrient. Vegetation fertilized and ameliorated soil mechanism is a right direction of abiding feedback, the longer time and m ore benefits