河套灌区盐分胁迫下水肥耦合效应响应机理及模拟分析word格式论文.docx

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河套灌区盐分胁迫下水肥耦合效应响应机理及模拟分析word格式论文.docx

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河套灌区盐分胁迫下水肥耦合效应响应机理及模拟分析word格式论文

ResponseMechanismofWaterandFertilizerCoupling EffectandSimulationunderSaltStressinHetaoIrrigationAbstractChinaseconomicdevelopmentisbasedonagriculturewhilethewaterresourcesis quitescarces.Watersaving,salinizationcontrolandutilizationinagticultureis mentionedto highposition.Developmentandutilizationofthelowerfertilityland especiallythesalinizationhasbecomeoneoftheimportantwaystosolvepopulation demandforfoodandagriculturalsustainabledevelopment.InwesternChina,theHeTao irrigationareabelongstodrought,coldanddesertregionalsowithlessrainfall.The inter-regional,inter-annualandinter-seasonaldistributionisunevenanditsvariation changesgreat.Thesoilevaporationisstrongandtheshortageofwaterresourceincreases daybyday.Thereexsitesseriouspotentialtheatetosecondarysalinizationwhensoil parentmaterialcontainssaltandgroundwaterlevelishigher.Soilisanimportantcarrier of agticulturesurvivalanddevelopment.Waterandfertilizerarethetwokeyfactorstothe agriculturedevelopmentandtheimprovement ofagriculture efficiency.Nodays,many domesticandforeignscholarshavecarriedoutextensivefruitfulstudiesoncouplingof waterandfertilizerwhearstheyaremainlyfocus ontheareawhichisnot salinization.Especiallyinwater-savingconditions,cropgrowinsaltstressenvironment thenthecouplingofwaterandfertilizermechanismbecomesmorecomplicated. Therefore,studyonmechanismofsalinizationcouplingofwaterandfertilizer,thekey problemtobesolvedurgentlyinnorthwestsalinizationregionwastomadethewater- fertilizer-saltcouplingmanagementmodewhichundertheconditionofsavingwater,This paper choosethemaineconomiccrops-oil sunflowerofHetaoirrigationas the studytarget,usingthepotesperimentincombinitionwiththefieldtestmethod,appling pedology,waterconservancy,plantphysiology,agriculturalandmeteorologicaletc multi-subject theoryandsomakingresearchonoil-sunflowercoplingofwaterand fertilizerwhichundertheconditionofsaltstess.Thoughanalyzingthepotandfieldexperientmeterials,itquantitativelydescribe theinfluenceregularityabouttheheight,stemdiameter,photosynt