黄浦江上游水源保护区农田氮磷养分平衡分析

Analysis on Nitrogen and Phosphorous Balances of Farmlands in Upper-reaches Water Resource Protection Zone of Huangpu River

通过对黄浦江上游水源保护区各类农田氮磷养分输入和输出的实地调查和资料分析,采用养分平衡盈亏评价方法,研究了黄浦江上游水源保护区不同类型农田养分平衡现状。结果表明:黄浦江上游水源保护区水田、旱地、园地氮素实际平衡盈亏率分别为31.17%、49.78%、44.33%,分别高出允许平衡盈亏率30.46%、90.18%、37.34%,磷素平衡盈亏率分别为9.57%、44.33%、53.71%,分别高出允许平衡盈亏率-15.51%、53.26%、33.21%。旱地氮磷养分盈余量远远超过适量盈余范围,存在过量氮磷养分对水源保护区水环境质量造成污染的潜在风险。

Based on field investigation and data analysis on input and output of nitrogen and phosphorous of different farmlands in upper-reaches water resource protection zone of Huangpu River,the balance status of nitrogen and phosphorous of farmlands were studied,by using the evaluation method of nutrient surplus and deficit rate.Results indicated that the real nitrogen surplus and deficit rates of paddy field,dryland and orchard were 31.17%,49.78% and 44.33% respectively,and 30.46%,90.18% and 37.34% respectively higher than permissible nitrogen surplus and deficit rates.Real phosphorous surplus and deficit rates of paddy field,dryland and orchard were 9.57%,44.33% and 53.71% respectively,and-15.51%,53.26% and 33.21% respectively higher than permissible phosphorous surplus and deficit rates.The surplus amounts of nitrogen and phosphorous of dryland greatly exceeded the suitable surplus range,which may cause the pollution risk to water quality in the water resource protection zone.