黄土丘陵沟壑区退耕还林的水土保持效益研究——以陕西省吴旗县为例

Study on Benefits of Soil and Water Conservation about Returning Cropland to Forest in Loessy Hilly Region of North Shaanxi——Take Wuqi County in Shaanxi province as an Example

在野外调查和试验小区观测的基础上,对吴旗县退耕还林所取得的水土保持效益进行了定量分析和研究,结果表明,通过退耕还林、封山禁牧,吴旗县植被覆盖率得到了明显提高,极大地改善了土壤的理化性质,植被群落趋于稳定,水土流失现象得到有效遏制。由此可见退耕还林、封山禁牧是治理黄土丘陵沟壑区水土流失的有效途径。

On the basis of investigation in the field and observation in experimental stations, the benefits of soil and water conservation about returning cropland to forest in Wuqi County are analyzed and studied quantitatively, Resuits show that vegetation coverage is obviously increased by returning cropland to forest and grazing prohibition in mountains, physical and chemical characters of soils are greatly improved, vegetation communities are becoming stable gradually, and the amount of ,soil and water loss is kept within limits. Thus it can be seen that measures of returning cropland to forest and grazing prohibition in mountains are the effective approach to control soil and water loss in loessy hilly region.