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1、浙江農林大學學報,2014,31(3):488—493JournalofZhejiangA&FUniversitydoi:10.11833~.issn.2095—0756.2014.03.024通過刺槐的水力結構特征參數(shù)探討管道理論王丁,楊雪,韓鴻鵬,張麗琴,薛建輝.(1.河南教育學院生命科學系,河南鄭州450046;2.南京林業(yè)大學江蘇省林業(yè)生態(tài)工程重點實驗室,江蘇南京210037)摘要:為了解刺槐Robiniapseudoacacia苗木對體內水分運輸過程的調控機制,基于水力結構理論,在充分供水條件下,
2、利用改良的“沖洗法”對2年生刺槐苗木的水力結.構參數(shù)進行測定,并探討了管道理論的合理性和適用范圍。結果表明:在充分供水條件下,刺槐苗木莖段導水率、比導率、葉比導率和胡伯爾值均隨被測莖段直徑的增加而增大;苗木不同生長階段,其導水率、比導率和葉比導率差異顯著(P<0.05),且均為生長旺期>生長初期>生長末期,胡伯爾值為生長初期最大,生長旺期和生長末期差異不顯著(P>0.05)。由此可推斷,①在水分脅迫條件下,苗木更傾向于保護那些較粗莖段;②苗木水力結構特征與提體內生理活動呈正相關關系;(管道模型假說雖然有其存
3、在的合理性,但也有其局限性和適用性,在對于水分在林木體內的運輸過程以及調控機制的解釋,管道模型假說過于簡單化了。圖4參26關鍵詞:樹木生理學;水力結構;管道理論;水分運輸;刺槐中圈分類號:$718.43文獻標志碼:A文章編號:2095—0756(2014)03.0488.06ThepipemodeltheorybasedonthehydraulicarchitectureparameterwithRobiniapseudoacaciaseedlingsWANGDing,YANGXue,HANHongpeng
4、,ZHANGLiqin,XUEJianhui(1.KeyDisciplineGroupofEcology,HenanInstituteofEducation,ZhengZhou450046,Henan,China;2.JiangsuProvincialKeyLaboratoryofForestryEcologicalEngineering,NanjingForestryUniversity,Nanjing210037,Jiangsu,China)Abstract:Tobetterunderstandthep
5、ipemodeltheoryandhydraulicarchitecturecharacteristicsofRobiniapseudoacaciaseedlingsindifferentgrowthstages(early,fast,andlast),theimprovedflushingmethodwasusedtomeasurethehydraulicarchitectureparametersoftwo—year-oldR.pseudoacaciaseedlingswithanadequatewat
6、ersupplyforthreegrowthstages(early,fast,andlast)andthereare20repeatsineverygrowthstages.Sig-nificancetestsweredonebetweenhydraulicarchitectureparametersandstemsegmentdiameteranddifferentgrowthstagesbyANOVA.Thenthepipetheorywasdiscussedbasedonhydraulicarchi
7、tecturetheory.Resultsshowedthatwithsufficientwater,thehydraulicconductivity(Kh),stemareaspecifichydraulicconductivity(K),leafspecificconductivity(KI),andHubervalue(Hv)ofR.pseudoacaciaseedlingsincreased(P<0.05)asthestemsegmentdiameterenlarged.Forthethreesee
8、dlinggrowthstages,Kh,K,andK1weresignificantlydifferent(P<0.05)withearlygrowthstage>fastgrowthstage>lastgrowthstage.Hvwasgreatest(P>O.05)intheearlygrowthstagewithnosignificantdifferencesinfastandlastgrowthstag