噴灌均勻系數(shù)對土壤水氮淋失及作物生長影響的田間試驗研究.pdf

1、分類號密級Y774224單位代碼：10019學(xué)導(dǎo)：S02910’專躪差弋夭等’學(xué)位論文噴灌均勻系數(shù)對土壤水氮淋失及作物生長影響的田間試驗研究EffectsofSprinklerUniformityonLeachingofWaterandNitrateandCropsGrowth研究生：宿捶塑指導(dǎo)教師：理紹丞熬援一合作指導(dǎo)教師：奎么生硒究雖申請學(xué)位類別：王堂亟擎業(yè)領(lǐng)域名稱：一盔些丞工程研究方向：丞資遂皇丞巫境所在學(xué)院：盛型量本王程堂暄20

2、05年5月中國農(nóng)業(yè)大學(xué)碩士學(xué)位論文摘要AbstractTheeffectsofuniformityofsprinklerwaterandfertigationonleachingofwaterandnitrateandcropsgrowtharefundamentallyimportantfordesigningasprinklerirrigationsystem，andthewaterandnitrateapplicationsare

3、thetwomainfactorsthataffectthenitrateleachingThesweetcoruandwinterwheatfieldexperimentswereconductedtoanalyzetheeffectsofsprinkleruniformityandfertigationonleachingofwaterandnitrateandcropsgrowth，andtheestimatemethodsofc

4、ropcoefficientsforsprinklerirrigatedwinterwheatandsweetoombasedollweighinglysimeterwerediscussedinthispaperThreeexperimentalplots，designedaslowuniformitymediumuniformityandhighuniformitywereusedinsweeteomfieldexperiment，

5、Thequantitiesofnitrateleachingwerecalculatedbywaterfluxandmassbalanceapproachesunderdifferentwri“deruniformityThreeexperimentalplots，designedaslowfertilizerapplicationrate，mediumfertilizerapplicationrateandhighfertilizer

6、applicationrate，wereusedinwinterwheatfieldexperimentTheresultsdemonstratedthattherelationshipbetweenempcoefficientsofsweetcornandwinterwheatanddaysafterseedingcanberepresentedbya4thorderpolynomialequationanda5thorderpoly

7、nomialequationrespectivelyThevariationofcropcoefficientsduringthegrowingseasonforsprinklerirrigatedcropsofNorthernChinaPlainscanbedescribedbythepatternssuggestedbyFAO56，butthecomputedcropcoefficientsareusuallysmallerthan

8、theobservedvalues，thereforeshouldbemodifiedbasedontheobservedresultsWhensprinkleruniformitychangedfrom70％to83％，ithadnosignificanteffectsondistributionandleachingofwaterandnitrate，andtherelationshipbetweenwaterdistributio

9、nabovecanopynitratedistributioninsoilandleachingofwaterandnitratewerenotdistinctWhentheinitialniIratecontentinsoilwasbetween380kgN／hm2end625kgN／hm2，andNfertigationchangedfrom0to180kg／hm2，fertigationhadsomeeffectouthepeak

10、valueofnitrateconcentraton，buthadnosignificanteffectsonthedistributionandleachingofwaterandnitrateFieldexperimentsalsodemonstratedthatthesprinkleruniformityandfertigationhadnosignificanteffectsoncropsyieldKeyWords：sprink