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时间:2019-02-05
《对膜下滴灌条件下绿洲棉田土壤水分运动数值模拟》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、维普资讯http://www.cqvip.com节水灌溉·2007年第6期文章编号:1007—4929(2007)06O0l7一O4膜下滴灌条件下绿洲棉田土壤水分运动数值模拟串志强,方怡向,盛钰。,赵成义(1.中国科学院新疆生态与地理研究所,新疆乌鲁木齐830011;2.中国科学院研究生院,北京100039;3.中国农业大学,北京100094)摘要:应用非饱和土壤水运动理论,建立膜下滴灌条件下土壤水分运动二维数值模拟模型,研究了田间层状土壤在膜下滴灌条件下土壤水分运动特征。应用不同小区不同灌水处理的实测值与模拟值进行对比,同时对模型做了精度分析,结果表明
2、符合精度要求,这说明所建立的模型能客观地反映实际土壤条件下的水分运动情况。研究结果表明:土壤剖面30-40cm粘土层使土壤水分运动具有很大的差异,0-30cm变化明显,而40cm以下土壤水分运动的变化较小。膜下滴灌应该采取灌水量小,频度大的灌溉模式。关键词:膜下滴灌、土壤水分运动;数值模拟;棉田中图分类号:$275.6文献标识码:ANumericalSimulationofSoilWaterMovementinOasisCottonFieldwithDripIrrigationunderMulchCHUANZhi—qiang~,FANGYi—xiang‘
3、。,SHENGYu’’,ZHAoCheng-yi(1.XinjiangInstituteofEcologyandGeography,ChineseAcademyofSciences,Urumqi83001l,China;2.Graduateschool,ChineseAcademyofSciences,Beijing,100039,China;3.ChinaAgriculturalUniversity,Bei}ing100094,China)Abstract:Basedonthetheoryofthemovementofunsaturatedsoil—w
4、ater,atwodimensionalverticalplanemodelwasdevelopedtOsimulatesoilwatermovementunderdripirrigationundermulch.Thesoilwatermovementofstratifiedsoilintheexperimentalfieldwascalculatedundertheconditionofdripirrigationundermulch.ThefieldtestwascarriedoutinAksuwaterbalanceexperimentstati
5、ontoverifythenumericalsimulationresultsofsoilwatercontentindifferenttestfieldwithdifferentirrigationtreatment.Theresultindicatedthattheyhadbetterconformity.Comparingthesollwatercontentof0-10cmdepthindifferenttimeanddifferentlocationobservedbyPTM-48(PhotosvnthesisTranspirationMoni
6、tor)withnumericalsimulationresults,itcanbefoundthatthenu—mericalsimulationresultswaslessthanthevalueoffieldtest,butthechangingtendencywasagreeable.Sothenumericalsimulationmodelofsoilwatermovementundertheconditionofdripirrigationundermulchisacceptable.Fromtheresearchresult,itcanbe
7、foundthatthesoilwatermovementwasexplicitlyvariousindifferentdepthfortheclaystratificationin3O~40cmdepth.Theobvi—OUSdifferencecanbeseeninO~3Ocmofsoilprofile,whilethereisnosharpchangebelowthe40cmdepth.Sotheirrigationwaterquantityshouldbereducedandtheirrigationfrequencyshouldbeincre
8、asedtoenhancethewateruseefficiency.Keywo
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