开发建设项目中植被自然恢复的水土保持作用

通过分析最新的水土保持监测所获得的实地植被调查样方资料，论述了植被自然恢复在开发建设项目中的水土保持作用，并结合监测实践，探讨了植被自然恢对水土保持评价指标的影响。（1）在山西省雨量较为充沛的地区，如果重视保留表土并用之覆盖地表，就能使地面植被得到较大程度的自然恢复，其恢复面积占可绿化面积的比例约达25％。（2）在雨量较多地区的扰动地面，依靠植被自然恢复功能，可使植被盖度在1～2a内达到50％以上，形成初级植被。（3）由于对乔灌木等深根性植物的破坏较为严重，因此，在1～2a时间内，扰动地面上自然恢复所形成的植被一般为草本群落，并不能完全恢复当地的灌草植被、疏林灌草植被。

Roles of Self-recovering Vegetation in Soil and Water Conservation in Development and Construction Projects

According to the data from the investigation of vegetation with soil and water conservation supervise measures, this paper discusses the roles of self-recovering vegetation in development and construction projects and probes into the effects of self-recovering vegetation on the evaluation indexes of soll and water conservation. The results obtained indicate that if surface soil is well preserved, surface vegetation self-recovering accounting for nearly one-fourths afforestation area can be gained in the abundant rainfall area. Depending on self-recovering vegetation on disturbed ground in the abundant rainfall area, primary vegetation coverage degree can reach more than 50% within 2 years. Owing to serious vegetation damage, shrubbery vegetation can not be completely recovered within 2 years and self-recovering vegetation on disturbed ground is generally the herbage communities.