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	降水对农田排水沟渠中氮磷流失的影响
	于会彬 ; 席北斗 ; 郭旭晶 ; 翟丽华 ; 何连生 ; 许其功 ; 刘鸿亮 ; YU Hui-bin ; XI Bei-dou ; GUO Xu-jing ; ZHAI Li-hua ; HE Lian-sheng ; XU Qi-gong ; LIU Hong-liang
	2010-06-10 ; 2010-06-10
关键词	农田排水沟渠 降水径流 回归分析 farming drainage ditch rainfall-runoff nitrogen phosphorus regression analysis X52
其他题名	Effect of Rainfall Runoff on Nitrogen and Phosphorus Loss in Farming Drainage Ditch
中文摘要	以浙江嘉兴双桥农场为研究对象,分析降水对农田沟渠中氮、磷流失的影响,揭示氮、磷在降水径流中流失的一般规律.在单晚稻生长期间,同步监测了施肥后的2次降水量和沟渠径流量,并对2次降水径流的全过程进行污染物含量的测定,对农田排水沟渠径流量与污染物含量随2次降水变化过程进行监测.结果表明:污染物含量变化呈现出大致相同的趋势,且污染物含量峰值比流量峰值提前2～3 h;在降水初期,污染物含量随径流量的增大而升高;随着流量的继续增大,含量呈下降趋势.施肥后4 d内降水的农田沟渠中氮、磷随径流的流失量比4 d后大.影响氮、磷流失的因素主要有降水量、降水时间间隔、径流量、施肥的种类和数量、土壤前期含水量以及沟渠中的沉积物等.氮流失的主要形态为氨氮和硝氮;磷流失的主要形态为磷酸盐.通过回归分析发现,径流量与氮、磷排放负荷间符合多项式关系.; The relationship of nitrogen and phosphorus loss and rainfall runoff based on natural rainfall events was monitored in a field drainage ditch of Shuangqiao farm in Jiaxing,Zhejiang Province.During growth of a single crop of late rice,rainfalls and ditch runoffs after fertilizing were measured twice simultaneously,and contents of nitrogen and phosphorous were also measured.The variations of nutrient concentration and runoff were measured and analyzed.The trends of concentration variation for nitrogen and phosphorous were almost the same,and their peak values were two to three hours earlier than the peak runoff.Shortly after rainfall started,the concentrations of nitrogen and phosphorus increased with increasing runoff flow.Later,they decreased with increased runoff flow.The loss of nitrogen and phosphorus within the first four days after fertilizing was greater than the loss after four days.The predominant factors affecting nitrogen and phosphorus loss were rainfall,rain interval,runoff,type and quantity of fertilizer,preliminary water content in soil,sediments in farming ditch and so on.The loss of nitrogen was mainly in the form of ammonia nitrogen and nitric-nitrogen;and the loss of phosphorus was mainly in the form of dissolved phosphate.Regression analysis results showed that a polynomial relationship existed between runoff and nutrient loads.; 国家重点基础研究发展计划(973)项目(2005CB724203); 博士点专项基金项目(20050027011)
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/65932]
专题	清华大学
推荐引用方式 GB/T 7714	于会彬,席北斗,郭旭晶,等. 降水对农田排水沟渠中氮磷流失的影响[J],2010, 2010.
APA	于会彬.,席北斗.,郭旭晶.,翟丽华.,何连生.,...&LIU Hong-liang.(2010).降水对农田排水沟渠中氮磷流失的影响..
MLA	于会彬,et al."降水对农田排水沟渠中氮磷流失的影响".(2010).

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