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1、欧美杨107不同冠层光合特性的研究第35卷第4期2011年7月南京林业大学(自然科学版)JournalofNanjingForestryUniversity(NaturalScienceEdition)Vo1.35.No.4Jn1.,2011http://www.nldxb.corn[doi:10.3969/j.issn.1000—2006.2011.04.008]欧美杨107不同冠层光合特性的研究马永春,方升佐(1.南京林业大学森林资源与环境学院,江苏南京210037;2.安徽省林业科技推广总站,安徽合肥230001)摘要:以欧美杨107(Populus×eu
2、ramericanaCV.Neva)为研究对象,观测了不同冠层的光响应曲线及光合特性的日变化,并分析了影响不同冠层净光合速率的主要生理生态因子.结果表明:光响应新模型P:对欧美杨107不同冠层光响应曲线拟合效果较好;由光响应曲1十,I线得出冠层I,Ⅱ,Ⅲ(造林后第1,2,3年所生的轮生枝)的最大净光合速率依次增大,分别为10.076,10.152,12.318Ixmol/(m?s),且净光合速率的日均值亦表现为冠层I较小,冠层Ⅱ次之,冠层Ⅲ较大,表明冠层的光合能力由强到弱依次为冠层Ⅲ,冠层Ⅱ,冠层I.通径分析表明,对冠层I,Ⅱ而言,胞间CO:浓度,空气温度是影响
3、净光合速率的主要因子;对冠层Ⅲ而言,气孔导度,胞间CO浓度,光合有效辐射,空气温度是影响净光合速率的主要因子.关键词:欧美杨107;光合响应曲线;净光合速率;通径分析中图分类号:$792.11;$718.3文献标志码:A文章编号:1000—2006(2011)04—0039—04Researchonph0t0synthesischaracteristicsindifferentcanopylayersofpoplarclone107(Populus×euramericanaCV.Neva)MAYongchun一,FANGShengzuo(1.CollegeofF
4、orestResourcesandEnvironment,NanjingForestryUniversity,Nanjing210037,China;2.AnhuiProvinceExtensionStation—generalofForestryScienceandTechnology,Hefei230001,China)Abstract:Lightresponsecurveanddiurnalchangeofphotosynthesischaracteristicsweremeasuredindifferentcanopylayersofpoplarclon
5、e107(PopulusXeuramericanaev.Neva),andthemaineeo—physiologicalfactorsaffectingnetpho—tosynthesisratewereanalyzed.Theresultsshowedthatlightresponsecurveofdifferentcanopylayersofpoplarclone107wassimulatedbetterwjthanewm.del.fP:.Themaximumnetphotosynticrate.ffhecanopyI,ⅡandⅢdisplayedinli
6、ghtresponsecurvewere10.076,10.152and12.3181xmol/(m's)respectively.Andthediurnalaverageofnetphotosyntheticrateofthecanopydisplayedinanascendingorderas:canopyI,1/andllI.TheseresuhsshowedthattheStrong—WeakorderofcanopyphotosyntheticcapacitywasthecanopyIH,II,I.Thecontribu—tionsofmaineco—
7、physiologicalfactorstonetphotosyntheticrateindifferentcanopylayersweredeterminedusingPathA—nalysis.ForcanopyIandII,theconsistencyofCO2amongcellsandairtemperaturewerethemainfactorstoimpactnetphotosyntheticrate.ForthecanopyllI,stomatalconductance,consistencyofCO2amongcells,photosynthet
8、icactiveradi
