干旱对红松和蒙古栎幼苗生长的影响及种间竞争.pdf

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1、植物研究2014，34(3)：364—371Bulletinof肋缸nZResearch干旱对红松和蒙古栎幼苗生长的影响及种间竞争吕海亮毛子军李娜(东北林业大学森林植物生态学教育部重点实验室，哈尔滨150040)摘要以红松(PinuskoraiensisSieb．etZucc．)和蒙古栎(QrcmongolicaFisch．exLedeb．)幼苗为研究对象，针对东北地区未来可能的干暖气候条件，利用盆栽实验进行干旱条件下两种幼苗的生长与竞争研究，分析其光合生理参数和生物量变化。一个生长季的实验结果表明：(1)干旱致使红松和蒙古栎幼苗的光合速率均下降，蒙

2、古栎降低幅度达到显著水平，红松下降不显著。干旱使蒙古栎的水分利用效率下降而红松却显著增加。干旱还导致蒙古栎幼苗的茎叶和侧根生物量以及全株叶面积下降，但却增加了红松的细根生物量和根冠比。(2)混栽栽植处理降低了蒙古栎幼苗的最大净光合速率和水分利用效率，进而减少了其茎和侧根生物量。而对于红松幼苗，混栽同样降低了其水分利用效率，但也增加了其比叶面积和全株叶面积，因而对幼苗生长影响较小。以上结果表明，蒙古栎对干旱反应更为敏感和迅速。种间竞争中红松幼苗比蒙古栎幼苗表现出更强的竞争能力。关键词蒙古栎；红松；种问竞争；干旱中图分类号：$791．274；$792．1

3、8文献标志码：Adoi：10．7525／j．issn．1673—5102．2014．03．013ResponseofGrowthandInterspecificCompetitionofPinuskoraiensisandQuercusmongolicaSeedlingstoDroughtL0Hai—LiangMAOZi—JunLINa(KeyLaboratoryofForestPlantEcologyofMinistryofEducation，NortheastForestryUniversity，Harbin150040)AbstractBroa

4、d-leavedKoreanpineforestisthezonalvegetationineasternmountainsofnortheastChina，whichaccountingforathirdoftheChina’Snationalforest．InordertounderstandtheresponseoftemperatedominanttreespeciesKoreanpineandmainassociatedtreespeciesMongolianoakinbroad-leavedKoreanpineforestunderfut

5、ureclimatechangeconditions(airtemperaturerising，decreaseinprecipitation)，acompetitionpotexperimentoftwo·-yearoldKoreanpineseedlingsandone—-yearoldMongolianoakseedlingsunderdifferentsoilwatercontentswereconductedundercompletelyrandomdesigninApril24，2012．Thisexperimentsetupfourex

6、perimentaltreatments，Witheighteenseedlingreplicatesforeachtreatment．Twolevelsofsoilwatercontentwererespectively75—85percentofthesoilwater-holdingcapacityforthehighlevel，and50—60percentofsoilwater—holdingcapacityforthelowleve1．Thecompetitiontreatmentsweresixsameseedlingsinonepot

7、formonocultureandthreeseedlingsforeachofthetwospeciesinonepotformixedculture．Weanalyzedthephotosyntheticandphysiologicalparametersandchangesinbiomassallocation．Theexperimentationofagrowingseasonshowedthat：(1)Soilwaterdeficittreatmentresultedinthedecreasesofthemaximumnetphotosyn

8、theticrateinbothKoreanpineandMongolianoakseedlingsther