摘要
为探索茭白田氮素的流失规律,减少水体富营养化,本文以测坑定位试验为基础,研究了在3种不同施肥处理下黄浦江上游地区茭白田水中氮素变化动态。结果表明,茭白田水中的氮素分布和其它水田作物相类似。各处理茭白田坑面水中氮素形态以NH+4-N为主;渗漏水中流失的氮素主要以NO3--N为主,分别占总氮的化肥处理73.44%,混合肥处理67.62%和有机肥处理53.31%。由剖面水中氮素分布可知,实际生产所施用的氮肥用量远远超过茭白生长所需。通过减少化肥用量而改施有机肥可减少施肥过后由暴雨引起的氮素径流流失和整个施肥期30%的地下水渗漏流失,同时对茭白产量没有显著影响。
In order to explore the rule of nitrogen loss in water bamboo fields and reduce the eutrophication of waters, the paper studied on the dynamic changes of nitrogen in the water of water bamboo fields in the upstream area of Huangpu River based on the lysimeter method. The results showed that NH4^＋-N was the main nitrogen form in the surface-water, and the main form of nitrogen loss in the leached-water was NO3^--N, accounting for CT, 73.44%, MT, 67.62%, and OT, 53.31%, respectively. According to the nitrogen distribution in the leached-water,the amounts of chemical fertil- izers used in real production are much more than ones needed in water bamboo. The results also showed that changing the chemical fertilizers into organic ones could reduce the nitrogen runoff loss in the early fertilization era and the leaching loss in whole era at the proportion of 30 percent ,while have no apparent effect on yield of water bamboo.
出处
《科技通报》
北大核心
2010年第1期109-114,共6页
Bulletin of Science and Technology
基金
上海市重点学科建设项目(B209)
关键词
测坑
茭白田
氮素
动态变化
lysimeter method
water bamboo fields
nitrogen
dynamic changes
