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中文摘要：
由于其污染的严重性和控制的难度,农田氮磷流失造成的农业面源污染问题已经引起全球的关注。与传统灌溉相比,节水灌溉在减少农田氮磷流失方面具有一定优势。对湖北省漳河灌区2007-2008年试验资料进行分析,结果显示与传统灌溉相比较,节水灌溉能够节灌25%以上;排水量水稻减少45.0%,玉米减少11.6%,渗漏量水稻减少31.7%;氮肥利用率增加3%～5%,说明该地区实行节水灌溉可以在节水的同时,提高化肥利用率,降低氮磷流失量,减少对水环境的污染。
英文摘要：
The agricultural non-point sources water pollution caused by nitrogen and phosphorus losses from farmlands have attracted global attentions due to its serious pollution and difficulties in control.Compared with conventional irrigation,water-saving irrigation has superiority of lessening nitrogen and phosphorus losses from farmlands.According to the experiment conducted during wet seasons in 2007-2008 in the Zhanghe Irrigation District in Hubei Province,China,the results show that compared to conventional irrigation,water-saving irrigation can save 25% of irrigation water,reduce 45% of drainage water in paddy field and 11.6% in corn field.It also can decrease 31.7% of percolation loss,and increase the nitrogen use efficiency to 3%~5%.This study indicates that implementation of water-saving irrigation in this region can not only save water,but also enhance fertilizer utilization efficiency,lower nitrogen and phosphorus losses,and cut down water environment pollution.
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