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密云水库林区有森林面积2 000多hm2,森林郁闭度达97.8％,多为油松、侧柏、洋槐等纯林,属于国家公益水源区养林;呵护着密云水库的水质清洁,保证密云水库的正常供水。可是伴随着林木的生长,病虫害发生也较为频繁,曾经施用过化学农药,虽然取得短期效果,但形成年年有虫年年防,一年更比一年重的恶性循环,而且造成很大的环境污染。而密云水库又是北京市主要饮用水源地,其环境保护与病虫害防治之间的矛盾调节至关重要。
Miyun Reservoir forest area of more than 2 000 hm2, forest canopy closed up to 97.8%, mostly as pine, Platycladus orientalis, acacia and other pure forests, belonging to the state public water source area conservation forests; care Miyun Reservoir water quality assurance Miyun Reservoir’s normal water supply. However, accompanied by the growth of trees, pests and diseases occur more frequently. Once chemical pesticides have been applied, short-term effects have been achieved. However, there is a vicious cycle of year after year with annual occurrences of pests, year more than a year, Environmental pollution. The Miyun Reservoir is the main source of drinking water in Beijing, the contradiction between environmental protection and pest control is crucial.