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1、http://www.paper.edu.cnRoot-Water/Nitrogen-UptakeandRootNitrogenMassofWinterWheatunder1OptimalWaterCondition*JianchuShiQiangZuoDepartmentofSoilandWaterSciencesDepartmentofSoilandWaterSciencesCollegeofResourcesandEnvironmentCollegeofResourcesandEnvironmentChinaAgriculturalUniversityC
2、hinaAgriculturalUniversityBeijing,PRC100094Beijing,PRC100044shijianchu@cau.edu.cnqiangzuo@cau.edu.cnAbstractRootwaterandnitrogenuptakearekeyprocessesforplantgrowthandsoilwaterandnitrogentransportinthesoil-plantsystem.Enormousefforthasbeenmadetosetuptherationalroot-water-uptake(RWU)a
3、ndroot-nitrogen-uptake(RNU)modelsonthebasisofrootlengthtosimulatesoilwaterandnitrogendynamics.However,thediversitiesofrootuptakeactivityamongdifferentrootsordifferentpartsofaroot,andtheeffectofsoilnitrogenlevelonRWUwereignored.Inthisstudy,twogreenhouseexperimentswithwinterwheatseedl
4、ingsculturedinnutrientsolution(Exp.1)andsandsoilcolumns(Exp.2)wereconductedtoinvestigatetherelationshipbetweenrootwater/nitrogenuptakeactivityandrootlength,rootnitrogenmass(RNM)ofwinterwheatunderoptimalwatercondition.ResultsshowedthatthepotentialRWUandRNUcoefficients(perunitrootleng
5、th)changedsensitivelywithrootageandsoilnitrogenlevel.Nevertheless,whenRNMwastakenintoconsideration,RWUandRNUwerefoundtobelinearlycorrelatedwithRNM,andthepotentialRWUcoefficientperunitRNMwasalmostaconstantforboththewholerootzoneanddifferentsoillayers,independentofrootageandsoilnitrog
6、enlevelbutdependentlinearlyonthefreewatersurfaceevaporationrate.TheinterrelationsbetweenRWU,RNUandRNMofwinterwheatunderoptimalwaterconditionwouldbehelpfultosetuprationalRWUandRNUmodelsforsimulatingsoilwaterandnitrogenmovementinthesoil-wheatsystem.Keywords:root-water-uptake,root-nitr
7、ogen-uptake,rootnitrogenmass,winterwheat.1IntroductionRootuptakeistimeandspacedependent,andaffectedbytheconditionsofclimate(e.g.,illumination,airtemperature,humidity,andwind,etc.),soil(soilwater,nutrient,osmoticpotential,andtexture,etc.),andplant(plantspecies,growthperiod,roots,etc.
8、).Theclimateconditi
