基于結(jié)構(gòu)方程模型的林分特征因子間耦合關(guān)系分析.pdf

1、UniversityCode：10225RegisterCode：S15790DissertationfortheDegreeofMasterAnanalysisofthecouplingrelationshipofstandcharacteristicfactorsbasedonstructuralequationCandidate：Supervisor：AssociateSupervisor：AcademicDegreeApplie

2、dfor：Speciality：Dateof0ralExamination：University：modelZhouJianpingProfWangShuliMasterSoilandwaterconservationanddesertificationcontrolJuly2015NortheastForestryUniversityAbstractAbstractIn也eprocessoftheforestmanagement，gr

3、aspingthestatusofforestresourcesofforeststandgrowthisveryimportanttomacro—managementofforestresourcesSiteconditions，standstructureandtreesdiversityhaveasignificantimpactontheforeststandgrowth，andanalyzingtherelationsbetw

4、eenthemeffectivelyandquantitativelyisconducivetooperationandmanagementofforestresourcesInordertofindouttherelationshipsofstandcharacteristicfactors，thestructuralequationmodelofthesiteconditionstandstructuretreesdiversity

5、standvolumeandsitecondition—structureofuppercanopylayer—treesdiversityofuppercanopylayer。structureandtreesdiversityoflowercanopylayerarebuilttakingsecondarymultiplespeciesforestbesideAshiRiverasexampleTheresultsshowthat：

6、Sitecondition，standstructureandtreediversityhaveapositiveeffectonthewholestandvolumeTheorderofinfluencecoefficientiSstandstructure，sitecondition，treesdiversity，totalpathcoefficientsare078，039，011Siteconditionhasanobvious

7、effectonstandstructureandtreediversityThebettersiteconditionthereiS，thebetterstands仉lc眥andtreesdiversitytheyhaveTheincreasingofsiteconditionandstands細(xì)cfnfeisalsocontributedtothestandvolumeSiteconditionhasapositiveimpacto

8、nstandgrowth，mostpartsofwhichisformedindirectlybyimprovingforests仃uctIlreandtreesdiversitySitecondition，structureofuppercanopylayerandtreesdiversityofuppercanopylayerhaveanegativee行Iectonstructureandtreesdiversityoflower

9、canopylayerTheorderofinfluencecoefficientisSitecondition，structureofuppercanopylayertreesdiversityofuppercanopylayer，totalpathcoefficientsare058，一O55，031Themainfactorswhichaffectingthegrowthoflowercanopylayerislight，wate

10、randheatBettersiteconditioniscontributedtothegrowthoftheuppercanopylayerDuetoshieldingeffectoftheuppercanopylayerthelowercanopymaygetlesslight，waterandheatItisnotconducivetothegrowthoflowercanopylayerTheslopepositioninth

11、esiteconditionhasasignificanteffectontheuppercanopylayerThelowerslopepositionis，thehigheraverageheight，crownareaandspeciesdiversityare。TheyintensifiedthecompetitiveeffectsofthelowercanopylayerThestructuralequationmodelof

12、thecouplingrelationshipofstandcharacteristicfactorswehavemadehasagoodinterpretationofthemaininfluencefactorsofstandgrowthNaturalsystemsareessentiallycomplexComparedwithtraditionalmultivariatemethods，fullyunderstandingnat

13、uralsystemsrequiresthecapacitytoexaminesimultaneousinfluencesandresponsesamongmultipleinteractingfactorsStructuralequationmodel(SEM)couldspecifythecausalordependentrelationshipsamongvariablesusingthepriorknowledgeofresea