通过测坑试验,研究了稻田水中氮素的变化动态、渗漏流失规律。结果表明,施肥后田水中氮素的浓度有逐日递减的趋势,但各种形态氮素的变化趋势有所不同,铵氮在第二天就减少了75%;不同施肥期氮素的渗漏流失量以基肥期为最大;在前茬为草莓的情况下以NO-3-N渗漏流失为主;NO-3-N作为氮素在土壤中淋失移动的主要形态将成为施用氮肥造成地下水污染的重要来源。 Through the test of pit, the dynamic changes of nitrogen and the law of seepage loss in paddy field water were studied. The results showed that the concentration of nitrogen in field water tended to decline day by day after fertilization, but the change tendency of different forms of nitrogen was different. The ammonium nitrogen decreased by 75% on the next day. The leakage of nitrogen in different fertilization period The loss was the largest in the basal period; the NO-3-N infiltration was the main loss in the previous straw crop; the main form of NO-3-N as the leaching and removal of nitrogen in the soil would be caused by the application of nitrogen fertilizer An important source of groundwater pollution.