植被覆盖作用下的水土流失效应研究

Study on the Effects of Soil and Water Losses under Different Vegetation Cover

通过对延庆县上辛庄径流试验站两年监测数据的分析,结果表明,植被覆盖度的提高可以明显抑制径流、土壤的流失强度,并且可消弱坡度、降雨对水土流失的影响程度.同时,30%的植被覆盖可能是该区能有效控制水土流失的临界值;污染物的流失强度随植被覆盖度的变化规律与径流与植被覆盖度的变化规律一致,即随着植被覆盖度增加而降低,说明植被措施对污染物流失的控制主要是通过减少径流泥沙而起作用的,但植被措施对不同污染物的抑制效果存在差异.

On the basis of the two years monitoring data in the Runoff Experimental Station of the county of Yanqing, the control effects of different vegetation cover on soil erosion was analyzed. The results show that increas- ing of vegetation cover has better effects for controlling the soil and water losses, and which could reduce the effects of slope and rainfall on soil and water losses. At the same time, the vegetation cover with 30% may be the threshold value of controlling the soil erosion in this area. The changed rule of contamination loss intensity along with the degree of vegetation cover is the same as runoff and soil losses, which proves that the achievement of vegetation measure controlling contamination loss is mainly the result of reducing the runoff and sediment. However, the control effects of vegetation measures on different contaminants are different.