The Nansihu Lake is an important reservoir in the East Route of South-to-North Water Diversion Project.According to production advantages around the lake,an efficient ecological agricultural farming and breeding mode of "biogas-fish-duck-grass-mushroom-organic fertilizer" was constructed using the agricultural circular economy theory of "reduction,reuse and recycle".The efficient ecological agricultural economy mode could replace the traditional high-polluting tillage method,improve water quality,reduce agricultural source pollutant,increase farmers' income and improve living environment surrounding the lake effectively.It played an important role in long-term improvement of water quality of Nansihu Lake and solving water pollution problems from the source.%南四湖是南水北调东线工程重要调蓄水库.根据湖区周边的生产主导优势,运用“减量化、再利用、再循环”的农业循环经济理念,构建了“沼气-鱼-鸭-草-蘑菇-有机肥”高效生态农业种养殖模式,以高效生态农业经济模式取代传统的高污染农业耕作方式,有效支撑南四湖周边水质改善、农业面源污染物削减以及湖区周边农民生产增收、生活环境美化,对长久改善南四湖水质可起到重要作用,从根源上解决水质污染问题.
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