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1、維普資訊http://www.cqvip.com節(jié)水灌溉·2007年第6期文章編號(hào)：1007—4929(2007)06O0l7一O4膜下滴灌條件下綠洲棉田土壤水分運(yùn)動(dòng)數(shù)值模擬串志強(qiáng)，方怡向，盛鈺。，趙成義(1．中國(guó)科學(xué)院新疆生態(tài)與地理研究所，新疆烏魯木齊830011；2．中國(guó)科學(xué)院研究生院，北京100039；3．中國(guó)農(nóng)業(yè)大學(xué)，北京100094)摘要：應(yīng)用非飽和土壤水運(yùn)動(dòng)理論，建立膜下滴灌條件下土壤水分運(yùn)動(dòng)二維數(shù)值模擬模型，研究了田間層狀土壤在膜下滴灌條件下土壤水分運(yùn)動(dòng)特征。應(yīng)用不同小區(qū)不同灌水處理的實(shí)測(cè)值與模擬值進(jìn)行對(duì)比，同時(shí)對(duì)模型做了精度分析，結(jié)果表明
2、符合精度要求，這說(shuō)明所建立的模型能客觀地反映實(shí)際土壤條件下的水分運(yùn)動(dòng)情況。研究結(jié)果表明：土壤剖面30-40cm粘土層使土壤水分運(yùn)動(dòng)具有很大的差異，0-30cm變化明顯，而40cm以下土壤水分運(yùn)動(dòng)的變化較小。膜下滴灌應(yīng)該采取灌水量小，頻度大的灌溉模式。關(guān)鍵詞：膜下滴灌、土壤水分運(yùn)動(dòng)；數(shù)值模擬；棉田中圖分類號(hào)：$275．6文獻(xiàn)標(biāo)識(shí)碼：ANumericalSimulationofSoilWaterMovementinOasisCottonFieldwithDripIrrigationunderMulchCHUANZhi—qiang～，F(xiàn)ANGYi—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
