DRAINMOD-NⅡ模拟暴雨后稻田排水及氮素变化  

Simulation of Drainage and Changes of Nitrogen in Paddy Fields During Rainstorms Using DRAINMOD-N Ⅱ

作　　者：王宁[1,2] 俞双恩[1,2] 叶兴成[3] 

机构地区：[1]教育部南方地区高效灌排与农业水土环境重点实验室,江苏南京210098 [2]河海大学水利水电学院,江苏南京210098 [3]宿迁市水务局,江苏宿迁223800

出　　处：《人民黄河》2014年第10期136-140,共5页Yellow River

基　　金：江苏省水利科技项目(2011037);江苏省高校优势学科建设工程资助项目(YS11001)

摘　　要：为探究暴雨后稻田排水与氮素流失规律，在宿迁市运南灌区试验基地开展了常规与控制灌排模式下暴雨后排水量及其NO-3-N和NH＋4-N浓度的观测试验，并利用DRAINMOD-NⅡ模型模拟排水量及其NO-3-N和NH＋4-N浓度。实测结果表明：控制模式与常规模式相比，排水量减少4.2%-54.9%，NO-3-N负荷减少39.9%-62.9%，NH＋4-N负荷减少30.0%-63.3%，表现为次降雨量越大，减排量越大。模拟结果表明：2种模式各次暴雨排水量模拟值的误差均在10.0%以内，4次暴雨排水总量模拟值的误差在5.0%以内；4次暴雨排出的NH＋4-N与NO-3-N负荷模拟值常规模式最大误差为6.0%左右，控制模式误差均在5.0%以内，2种模式的相关系数R与效率系数NS指标均较好。采用控制灌排模式能够有效减少排水量，提高雨水利用效率，减少NO-3-N和NH＋4-N流失；DRAINMOD-NⅡ模型能够有效地描述暴雨后稻田排水及氮素运移过程。In order to explore the law of paddy field drainage and nitrogen loss after rainstorm,experiment of measurement and simulation by using DRAINMOD-N Ⅱ of drainage volume and the concentration of nitrate-N and ammonium-N in it under conventional and controlled irrigation and drainage mode after rainstorm was carried out in Yunnan irrigation area experimental base in the city of Suqian. Measured results show that compa-ring with conventional mode,the percentage reductions of drainage volume,load of nitrate-N and ammonium-N of controlled mode are 4. 2% -54. 9% ,39. 9% - 62. 9% and 30. 0% - 63. 3% ,respectively. It shows that the more the individual rainfall,the more the emission reduction. The simulated results show that the errors between simulation and measurement of drainage volume under the two modes after each rainstorm are all less than 10. 0% ,the errors between simulation and measurement of the whole drainage volume after four rainstorms are within 5. 0% ;the maxi-mum of total relative error between the simulation and measurement of nitrate-N and ammonium-N load coming from four rainstorms under the con-ventional mode is about 6. 0% and the controlled mode is all less than 5. 0% ,the two modes are both perfect in correlation coefficient R and NS in-dex. The drainage volume,loss of nitrate-N and ammonium-N can be effectively decreased and the rainwater use efficiency can be increased by u-sing controlled irrigation and drainage mode;DRAINMOD-N Ⅱ can perfectly describe the process of paddy field drainage and nitrogen transport.

关 键 词：暴雨 灌排模式 氮素运移 DRAINMOD-NⅡ 模拟 

分 类 号：S276.7[农业科学—农业水土工程] S143.1[农业科学—农业工程]