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1、ACTAECOLOGICASINICAVolume28,Issue2,February2008OnlineEnglisheditionoftheChineselanguagejournalCitethisarticleas:ActaEcologicaSinica,2008,28(2),525?533.RESEARCHPAPERResponsesofwateruseefficiencyof9plantspeciestolightandCO2andtheirmodelingWangJianlin1,YuGuirui2,*,FangQuanxiao1,JiangDefeng1,QiHua3
2、,WangQiufeng21QingdaoAgriculturalUniversity,Qingdao266109,China2InstituteofGeographicSciencesandNaturalResourcesResearch,ChineseAcademyofSciences,Beijing100101,China3ShenyangAgriculturalUniversity,Shenyang110161,ChinaAbstract:Photosynthesiscoupledwithtranspirationdetermineswateruseefficiency(WU
3、E)atleaflevel,andtheresponsesofWUEcontrolledbygasexchangesthroughstomatatoenvironmentarethebasisofcarbonandwatercyclesintheecosystem.Inthispaper,byusingLi-6400PortablePhotosynthesisSystem(LI-COR),WUEatleaflevelwasanalyzedundercontrolledphotosyntheticphotonsfluxdensity(PPFD)andCO2concentrationco
4、nditionsacross9plantspeciesincludingmaize(Zeamays),sorghum(Sor-ghumvulgare),millet(Setariaitalica),soybean(Glycinemax),peanut(Arachisphyogaea),sweetpotato(Ipomoeabatatas),rice(Oryzasativa),Massonpine(Pinusmassoniana)andSchimasuperba.Wehaddevelopedanewmodeltoestimatethewateruseeffi-ciencyinrespo
5、nsetothecombinedeffectsoflightandCO2concentration.Ourmeasureddatavalidatedthatthismodelcouldsimu-latethechangesofwateruseefficiencyverywellundercombinedeffectoflightandCO2concentration.Itcouldbeusedtoestimatecontributionofphotosynthesisincreaseandtranspirationdeclineonwateruseefficiencywithther
6、isingofCO2concentration.GreatdifferencesinwateruseefficiencyoccurredinthesedifferentplantspeciesundervariousCO2concentrationlevels.Basedonwateruseefficiencyatregionalscale,weconcludedthatplantsshouldbeseparatedintoC3plantsandC4plants,andfurthermore,C3plantsshouldbeseparatedintoherbaceousplantsa
7、ndwoodyplants.Ourseparationcriteriawoulddoagreatfavorinmodelingtheevapo-transpirationofterrestrialecosystemwithcarbonandwaterbalance.KeyWords:wateruseefficiency(WUE);photosyntheticphotonsfluxdensity(PPFD);CO2concentration;modeling
