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1、模拟增温对川西北高寒草甸两种典型植物生长和光合特征的影响应用与环境生物2009,15(6)750-755ChinJApplEnvironBioI=ISSN1006-687X2009一l2-z25DOI:l03724/SPJ1145200900750模拟增温对川西北高寒草甸两种典型植物生长和光合特征的影响术石福孙吴宁料吴彦王乾(中国科学院成都生物研究所生态恢复重点实验室成都610041)摘要在野外自然条件下采用开顶式生长室(OTC)模拟增温的方法,研究了增温对川西北高寒草甸两种典型植物一一单子叶草本植物发草(Deschampsiacaespito
2、sa)和双子叶草本植物遏蓝菜(ThlaspiaFVeHSC)生长和光合特征的影响.结果表明,增温有利于发草地上生物量的增加,其光响应曲线明显高于对照处理,净光合速率(P),蒸腾速率(),气孑L导度(C),最大净光合速率(尸),暗呼吸速率(R),表观量子效率(AQY)和光饱和点(LSP)显着高于对照处理,而光补偿点(LCP)却显着低于对照处理,并且最大光能转化效率(,),光合量子产量(Yield),光化学猝灭系数(qp)和非光化学猝灭系数(q)与对照处理相比,都显着增加;增温后遏蓝菜的单株生物量积累显着下降,其光响应曲线也明显低于对照处理,,,c
3、s,P～,,AQY和LsP显着低于对照处理,,在增温后显着减少,而却显着增加.图表参25mRYield~'tlq53关键词川西北;增温;发草;遏蓝菜;生长;光合特征CLCS948.112.2(271)EffectofSimulatedTemperatureEnhancementonGrowthandPh0tOsvnthesisOfDeschampsiacaespitosaandThlaspiarvenseinNorthwesternSichuan,ChinaSHIFusun.WUNing**.WUYan&,^NGQian(ECORESL
4、ab,ChengduInstituteofBiology,ChineseAcademyofSciences,Chengdu610041,China)AbstractOpen—topchamber(OTC)wasadoptedtosimulatetemperatureenhancementinthefield,andthisstudyfocusedontheeffectoftemperatureenhancementonthegrowthandphotosyntheticcharacteristicsoftwoalpineplantsDescha
5、mpsiacaespitosa(gramineousgrass)andThlaspiarvense(forb)innorthwesternSichuan,China.ThetemperatureenhancementevidentlyincreasedtheabovegroundbiomassofD.caespitosacomparedtothecontrolplot,andthenetphotosynthesisrate(尸n),transpirationrate(,stomatalconductance(c),maximumnetphoto
6、synthesisrate(尸),darkrespirationrate(Rd),apparentquantumyield(AQY),andlightsaturationpoint(LSP)ofD.caespitosawereobviouslyhigherthanthoseofthecontrolplot.However,thephotosyntheticlightcompensation(LCP)ofD.caespitosainOTCwassignificantlydecreased.Thechlorophyllfluorescencekin
7、eticparameterssuchasF/Fro,yield,qP,andqNweremarkedlyincreasedcomparedtothecontro1.However,warmingtreatmentsignificantlydecreasedtheindividualabovegroundbiomassaccumulationofarvense,andevidentlydecreasedthelightresponsecurvescomparedtothecontrolplot,andthe尸n,,C,P,Rd,AQYandLSP
8、wereobviouslylowerthanthoseofthecontrolplot.Besides,F/,yield,andqPweremarke
