1、中國農(nóng)業(yè)大學(xué)碩士學(xué)位論文覆膜旱作條件下水稻氮素營養(yǎng)和土壤氮素轉(zhuǎn)化的研究姓名：王瑞芳申請學(xué)位級別：碩士專業(yè)：植物營養(yǎng)學(xué)指導(dǎo)教師：林杉2002.6.1Abstract個(gè)wopotexperimentscoveredwithplasticfilmwfrecarriedouttoinvestigatetheeffectofnitrogenapplicationandtypesOnriceyield，relevantparametersandni

2、trogenuptakeBymeansofsnifflemicroscopeandmassspectrometer，thegasexchangeabovethestomaoftheleafaffectedbynitrogenformwerestudiedInordertosupplythebasicunderstandingfordevelopinganewfertilizerforthegroundcoverriceproductio

3、nsystem(GCRPS)，twoadditionalincubationexperimentsconcerningaboutnitrificationinhibitorsandstraw／nitrogeninteractionwereinvestigatedThemainconclusionsfoIlowed：Comparedwithnormalfloodingcultivation，theyieldofricedecreasedu

4、nderGCRPS，butthenitrogenuseefficiency(NUE)andwateruseefficiencyincreasedUnderGCRPS，theNUEdecreasedwiththeincreasingofnitrogenapplication，butnitrogenapplicationhasnosignificanteffectontheyieldofriceSplitapplicationincreas

5、edtheyieldofrice，whilecoatedfertilizerandthenitrificationinhibitordidnotNUEincreasedwithapplicationofthecoatedfertilizerandthenitrificationjnhibitorThesnifflemicroscopeandmassspectrometerisagoodtooltomeasurethegasexchang

6、eabovethestomaoftheleafAtthedistance(20m)abovestomaofleaf，thewater，carbonoxideandoxygenconcentrationofammoniumfedmaizeWashigherthannitratefed，whilenitricoxideconcentrationloweEPlantextractG93inhibitedremarkablythenitrifi

7、cationprocess，resultinginhigherammoniumconcentration，whilelowernitrateconcentrationinthesoilTheammoniumconcentrationincreasedwiththeapplicationamountofstrawwhilethenitrateconcentrationdecreasedKeywords：ricegroundcoverric