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《co_2摩尔分数增高对盆栽香樟光合特性及生长量的影响》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第39卷第5期东北林业大学学报Vol.39No.52011年5月JOURNALOFNORTHEASTFORESTRYUNIVERSITYMay2011www.grain17.com1)CO摩尔分数增高对盆栽香樟光合特性及生长量的影响2毕玉伟秦俊胡永红刘庆华(上海植物园,上海,200231)(青岛农业大学)摘要以开顶式塑料薄膜气室[Open—TopChamber,OTC]为设施,运用LI—6400便携式光合测定系统,研究了2年生盆栽香樟(Cinnamomumcamphora(L.)Presl.)叶片的净光合速率和生长量在高
2、CO2摩尔分数下的响-1-1应。结果表明:在各自生长环境下,处理组OTC1[(1000±100)μmol·mol]、OTC2[(700±100)μmol·mol]的-1香樟净光合速率在整个处理期间均高于对照组CK[(400±50)μmol·mol]的,同时光补偿点降低,光饱和点提高。叶片净光合速率的日变化最大值分别出现在8:00和14:00左右,有明显的光合午休现象;CO2摩尔分数增高可以提高叶片的净光合速率和瞬时水分利用效率,使蒸腾速率和气孔导度下降。在生长量方面,处理组OTC1、OTC2的株高、单叶面积、基茎、株鲜质
3、量、株干质量分别比对照组CK的有显著提高,有利于其生长。关键词香樟;CO2摩尔分数;光合速率;生长量分类号Q945.78;Q949.747.5EffectsofElevatedCarbonDioxideConcentrationonPhotosyntheticCharacteristicsandGrowthofCinnamomumcamphoraSeedlings/BiYuwei,QinJun,HuYonghong(ShanghaiBotanicalGarden,Shanghai200231,P.R.China);Liu
4、Qinghua(QingdaoAgriculturalUniversity)//JournalofNortheastForestryUniversity.-2011,39(5).-27~29,43Anexperimentwasconductedtostudytheresponsesofphotosyntheticcharacteristicsandgrowthoftwo-year-oldpottedseedlingsofCinnamomumcamphora(L.)Presl.totheelevatedcarbondiox
5、ideconcentrationbytheopen-topchamberand-1LI-6400PortablePhotosynthesisSystem(LI-COR).Thecarbondioxidelevelswere(1000±100)μmol·molfor-1-1treatment1,(700±100)μmol·molfortreatment2and(400±50)μmol·molforCK.Resultsshowedthatthepho-tosyntheticrates(Pn)oftheleavesofC.ca
6、mphoraseedlingsintreatment1andtreatment2werehigherthanthatinthenaturalcondition(CK)throughoutthewholetestperiod.Thelightcompensationpointdecreased,whilelightsaturationpointincreased.ThePnshowedtwopeaksat08:00and16:00respectively,withanobviousmiddaydepressionpheno
7、me-non.Pnandinstantaneouswateruseefficiencyincreasedandtranspirationrateandstomatalconductancesignificantlyde-creasedwiththeelevatedCO2concentration.Moreover,theelevatedCO2concentrationalsohadanimportantinfluenceonthegrowthoftheseedlings.Theincreaseinheight,leafa
8、rea,stembase,freshweightanddryweightofC.camphoraseedlingsintreatment1andtreatment2wasmoreobviousthanthatintheCK,whichwasfavorabletotheirgrowth.KeywordsCinnamom
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