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1、歐美楊107不同冠層光合特性的研究第35卷第4期2011年7月南京林業(yè)大學(自然科學版)JournalofNanjingForestryUniversity(NaturalScienceEdition)Vo1.35.No.4Jn1.,2011http://www.nldxb.corn[doi:10.3969/j.issn.1000—2006.2011.04.008]歐美楊107不同冠層光合特性的研究馬永春,方升佐(1.南京林業(yè)大學森林資源與環(huán)境學院,江蘇南京210037;2.安徽省林業(yè)科技推廣總站,安徽合肥230001)摘要:以歐美楊107(Populus×eu
2、ramericanaCV.Neva)為研究對象,觀測了不同冠層的光響應曲線及光合特性的日變化,并分析了影響不同冠層凈光合速率的主要生理生態(tài)因子.結(jié)果表明:光響應新模型P:對歐美楊107不同冠層光響應曲線擬合效果較好;由光響應曲1十,I線得出冠層I,Ⅱ,Ⅲ(造林后第1,2,3年所生的輪生枝)的最大凈光合速率依次增大,分別為10.076,10.152,12.318Ixmol/(m?s),且凈光合速率的日均值亦表現(xiàn)為冠層I較小,冠層Ⅱ次之,冠層Ⅲ較大,表明冠層的光合能力由強到弱依次為冠層Ⅲ,冠層Ⅱ,冠層I.通徑分析表明,對冠層I,Ⅱ而言,胞間CO:濃度,空氣溫度是影響
3、凈光合速率的主要因子;對冠層Ⅲ而言,氣孔導度,胞間CO濃度,光合有效輻射,空氣溫度是影響凈光合速率的主要因子.關(guān)鍵詞:歐美楊107;光合響應曲線;凈光合速率;通徑分析中圖分類號:$792.11;$718.3文獻標志碼:A文章編號: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