不同施氮量和氮素形式对水稻光合特性的影响

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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