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ID:36780928
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时间:2019-05-15
《DRAINMODNⅡ模拟暴雨后稻田排水及氮素变化》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第36卷第1O期人民黄河Vo1.36.No.1O2014年10月YELLOWRIVER0ct..2014【灌溉排水】DRAINMOD.NⅡ模拟暴雨后稻田排水及氮素变化王宁,俞双恩,叶兴成(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)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;一N和NH4+一N浓度的观测试验,并利用DRAINMOD—NII模型模拟排水量及其NO;一N和NH;一N浓度
2、。实测结果表明:控制模式与常规模式相比,排水量减少4.2%一54.9%,NO;一N负荷减少39.9%一62.9%,NH—N负荷减少30.0%一63.3%,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.O%以内;4次暴雨排出的NH:一N与NO;一N负荷模拟值常规模式最大误差为6.O%左右,控制模式误差均在5.0%以内,2种模式的相关系数与效率系数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;一N和NH4+一N流失;DRAINMOD—NⅡ模型能够有效
3、地描述暴雨后稻田排水及氮素运移过程。关键词:暴雨;灌排模式;氮素运移;DRAINMOD—NII;模拟中图分类号:$276.7;S143.1文献标志码:Adoi:10.3969/j.issn.1000—1379.2014.10.041SimulationofDrainageandChangesofNitrogeninPaddyFieldsDuringRainstormsUsingDRAINMoD—NⅡWANGNing,YUShuang.en,YEXing.cbeng(1.KeyLaboratoryofEficientIrigation—DrainageandAgrie
4、ulturalSoil-WaterEnvironmentinSouthernChina,MinistryofEducation,Nanjing210098,China2.CollegeofWaterConservancyandHydropower,HohaiUniversity,Ning210098,China;3.SuqianCityWaterAuthority,Suqian223800,China)Abstract:Inordertoexplorethelawofpaddyfielddrainageandnitrogenlossafterrainstorm,ex
5、perimentofmeasurementandsimulationbyusingDRAINMOD.NIofdrainagevolumeandtheconcentrationofnitrateNandammonium—NinitunderconventionalandcontrolledirrigationanddrainagemodeafterrainstormwascarriedoutinYunnanirrigation81"caexperimentalbaseinthecityofSuqian.Measuredresultsshowthatcompa·ring
6、withconventionalmode,thepercentagereductionsofdrainagevolume.1oadofnitrate—Nandammonium—Nofcontrolledmodeare4.2%~54.9%,39.9%~62.9%and30.O%~63.3%,respectively.Itshowsthatthemoretheindividualrainfall,themoretheemissionreduction.Thesimulatedresultsshowthattheero~betweensimulationandmeasur
7、ementofdrainagevolumeunderthetwomodesaftereachrainstormareal1lessthan10.O%.theerrorsbetweensimulationandmeasurementofthewholedrainagevolumeafterfourrainstormsarewithin5.0%:themaxi—mumoftotalrelativeerorbetweenthesimulationandmeasurementofnitrate—Nandammonium.Nloadcomingfromfourrainst
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