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以北京市门头沟区龙凤岭水土保持科技示范园为研究对象,对2005—2009年汛期(5—11月)径流小区的径流量、侵蚀产沙量及养分流失量进行了分析。结果是:同为10 m坡长的径流小区,其径流量和养分流失量从大到小依次为裸地、坡耕地和石坎梯田,产沙量最大的是裸地,其次是石坎梯田,最小的是坡耕地;与裸地小区相比,10 m坡长的水土保持措施小区可减少全氮流失量50.5%~91.4%、减少全磷流失量31.8%~75.8%;20 m坡长裸地径流小区的径流量、泥沙量和养分流失量均明显大于鱼鳞坑,鱼鳞坑小区可减少径流量68.4%~83.0%、减少产沙量71.1%~82.7%、减少全氮流失量64.4%~74.9%、减少全磷流失量40.6%~87.3%。说明水土保持措施具有良好的保持水土和减少养分流失的作用。
Taking Longfengling Soil and Water Conservation Technology Demonstration Park in Mentougou District of Beijing as the research object, the runoff, erosion and sediment yield and nutrient loss of the runoff in 2005-2009 flood season (May - November) were analyzed. The results showed that the runoff plots with the slope length of 10 m had the largest amount of bare land, followed by the ridges and the smallest ones Compared with the bare land area, the measures of soil and water conservation measures with a slope length of 10 m can reduce the total nitrogen loss by 50.5% -91.4% and the total phosphorus loss by 31.8% -75.8%; The runoff, sediment and nutrient loss of runoff plot were significantly larger than that of fish scale pit, and the fish scale pit plot could reduce runoff 68.4% -83.0%, sediment yield 71.1% -82.7% and total nitrogen loss 64.4% 74.9%, reduce the total phosphorus loss 40.6% ~ 87.3%. This shows that soil and water conservation measures have a good effect on soil and water conservation and nutrient loss reduction.