資源描述：
《不同施氮量和氮素形式對(duì)水稻光合特性的影響》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在應(yīng)用文檔-天天文庫(kù)。
1、ABSTRACT^Thenetphotosynthesisrate(Pn)，stomatalconductance(Gs)，wateruseefficiency(wUE)andphotosynthesisnitrogenuseefficiency(PNUE)wascomparedbetweentworicecultivars(OryzasativaL．)：Liangyoupeijiu(LY)andShanyou63(SY)．WealsoinvestigatedtheeffectofendogenouscarbohydrateonPn，Gsandintercell
2、ularcarbondioxideconcentration(c／)ofleavesofrice．Theresultshowedthat：1．ThereislittledifferencebetweenthePnofleavesunderhighandlowamountofureabeforeheadingBut10daysafterheading，thePnofleavesunderhil曲amountofureawashigherthanthatunderlowamountofurea，andthisdifferencebecamemoredistincte
3、specially30daysafterheading．Duringsenescencestage，LYhashigherPnthanthatofSY．Withthedevelopmentofseed，thePnofLYdecreasedmoreslowlythanthatofSY2，Afterheadingstage，theCiofleavesunderlowamountofureawashi曲erthanthoseofothertreatmentsAndthestomatalconductanceofleavesunderlOWamountofureawas
4、higherthanthatunderhighamountofurea．Theleavesofriceunderhighamountofurea，hadhigherWUEthanthatunderlowamountofurea．Afterheading，theWUEofLYwashJlgherthanthatofSY3Underdifferentnitrogenformstreatment，thePnofleaveswithureatreatmentwasthehighest．Afterheading．thePnofleaveswithNH4+-NasNsour
5、cewashigherthanthatwithN03--NasNsource．TheCiof1eaveswithureaasNsourcewaslowerthanthatofothertreatments，whilethereiSlitnedifferencebetweentheCiof1eavesunderNH4+-N03’andN03-NH4+asNsource．4．ThePnandGsof1eavesofricehasclosecorrelation．FromtheGs．PnCHIVeofleavesofSY,wecandeducethatPnwouldn
6、otrisewhenGswashigherthan5mol[t20m一2s一，butnosimilaritywasobservedinLY．TherelationshipbetweenGsandPnwithdifferentNtreatmentwasanalogous．5．ThePNUEofleaveswithhighamountofNwashigherthanthatunderlowamountofNAfterheadingstage，thePNUEofleavesofLYwerehigherthanthoseofSYTherewasnoobviousdiff
7、erencebetweenthePNUEofleavesofSYunderNH4+-N03+andN03--NH4+asNsourceafterheadingstage．AsforLY,thePNUEofleavesunderureatreatmentwashigherthantheothertreatments，andthePNUEofleavesunderNH4+treatmentwerehigherthanthoseunderN03一treatment．6ThePn，6"／andGsofleavesdecreasedwiththeincreaseofend
8、ogenoussucro
