畦灌表施肥料条件下氮素入渗量估算模型.docVIP

 畦灌表施肥料条件下氮素入渗量估算模型# 5 10 15 20 25 30 35 40 45  摘要：研究畦灌表施肥料条件下的氮素入渗量估算模型，旨在可以利用水分入渗模型及地表 水流运动与氮素浓度观测，估算出灌后肥料在土壤中沿畦长方向的分布，避免取土样化验测 定灌水前后土壤中氮素含量方法工作量大的缺陷。试验于 2010 年 3 月在河北省南皮县双庙 育种农场的冬小麦畦田中进行，共设计 6 个试验方案，分别观测地表水流的推进与消退时间、 地表水流中尿素浓度及灌水前后土壤中硝态氮、铵态氮和尿素态氮浓度。与取土化验的实测 值相比，利用本文氮素入渗量估算模型得到的氮素入渗量值的相对误差均值在 6.71%-12.35%之间。结果表明，构建的畦灌表施肥料下氮素入渗量估算模型，只需观测田面 水流推进、消退过程和地表水流中的浓度变化过程，便可估算沿畦长方向各点氮素入渗量并 评价施肥质量，观测方便，田间试验工作量小。 关键词：畦灌；表施肥料；Kostiakov 模型；氮素入渗量 中图分类号：S275.3 S143.1 Estimation Model of Nitrogen Infiltration for Surface Fertilizer Application under Border Irrigation JIAO Xiyun1,2, YU Xiaobin1,2, ZHANG Xian1,2, WANG Zhitao1,2 (1. State Key Laboratory of Hydrology-Water Resources Hydraulic Engineering,Hohai University, NanJing 210098; 2. College of Water Conservancy and Hydropower Engineering,Hohai University, NanJing 210098) Abstract: It researched the estimation model of nitrogen infiltration for surface fertilizer application under border irrigation. With this infiltration model, observation of surface water flow motion and nitrogen concentration, it can estimate fertilizer distribution after irrigation along the length direction, and avoiding big workload of determining nitrogen content before and after irrigation by sampling test. In march of 2010, the test was carried out in border check for winter wheat , which was in Shuangmiao breeding farm, Nanpi County, Hebei Province. There were six testing programs and separately observed water flow advance and recession time, nitrogen concentration of overland flow and concentration of nitrate nitrogen, ammonium nitrogen, urea nitrogen before and after irrigation. Compared with measured value from sampling test, the average relative error is between 6.71%~12.35% by using estimation model of nitrogen infiltration. Results showed that estimation model of nitrogen infiltration for surface fertilizer application under border irrigation could be applied to estimate each point nitrogen infiltration along the length direction and evalua