对膜下滴灌条件下绿洲棉田土壤水分运动数值模拟

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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