密云水库水源涵养林对水质的影响

 为给密云水库流域的水质保护规划和控制措施提供理论依据,以密云县北庄镇为试验区对水源涵养林进行调查,对地表水进行监测,分析水质中存在的主要问题及其产生的原因。自2000年密云水库流域开始实施“退耕还林”工程以来,森林面积不断增加,减少了由于农田施肥造成的非点源污染,使地表水水质的浑浊度和氨氮指标有所下降。以油松林和板栗林为例,对降雨流经森林生态系统各环节的水质进行监测、分析,说明密云水库流域水源涵养林与降雨之间的淋溶、交换、吸附等过程对降雨具有净化作用。

Analysis to Influence of Water Conservation Forest in Miyun Reservoir on Water Quality

Taking Beizhuang village of Miyun county for a experimental site, based on investigation to water conservation forest and observation of surface water, the main problems and causes of water quality were analyzed. Since engineering of reuse farmland for afforestation of Miyun reservoir was put in practice in 2000, forest area had increased, and non point sources pollution caused by field fertilization had been reduced, which led muddy degree of surface water and the content of NH + 4 and Tur to decline. In the case of Pinus tabulaeformis Carr forest and Castanea mollissima Bl forest, water quality of runoff produced by precipitation which flowed in forestry eco system was supervised and analyzed. The results showed the process of leaching, exchange, adsorption, etc. between water conservation forest in valley of Miyun reservoir and precipitation can cleanse precipitation.