天然针阔混交林择伐生态影响与作业技术.研究

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1、福建农林大学2008届硕士学位论文AStudyontheEcologicalEffectsandOperationTechnologyofSIectiveCuttingofNaturalMixedStandofConiferandBroad．1eavedTreesAbstract：Thenaturalmixedforestsoftoniferousandbroadleafhavecomplicatedstructure，variousspecies，andprominentecologicalfunction．Buttheydivideintocompetencedemonstr

2、atethatCan‘tbeconstantinviewandstand．So，theyneedadoptingthemanagementtacticswithrationalsciencebadly．Slectivecuttingofnaturalmixedforestsofconiferousandbroadleafismostreasonabletypeofmanagementaccordingtotheactualconditionsofdifferentareasandstands·SelectivecuttingCanmakefulluseoftreegrowpote

3、ntialityandforestproductivity，increasespeciesdiversityandimproveresistanceagainstdiseasesofforest．Itisfavorablefortherationalcirculationofnutriment．ItCanreducethebrokennessintensityofforest，improvetheprotectefficiencyofforestandformtheharmoniousview．Asselectivecuttingisaccordwiththenaturallaw

4、，itwasreceivedmoreandmoreattentionbyecologists，biologists，forestryscholarsandloggingscholars．。ThesampleplotsofthedynamicallystudyonselectivecuttingandupgradeofnaturalforestwereselectedinDayuanloggingcampslocatedinJian’oncity，Fujianprovince．Theexperimentalstandsweredevelopedselectivecuttingofd

5、ifferentintensity(10wintensity13．0％；middleintensity29．1％；highintensity45．8％；over-highintensity67．1％)inAugust，1996，andnon-cutingandclearcuttingwerecompared(naturalregenerationaftercutting)．Follow．upinvestigationWassurvedandanalyzedagaininJuly，2006．Vegetationswereinvestigatedinthewayofstandards

6、ampleplots，forestlitterswerecollectedandsoilsectionswereexaminedbeforeandafterselectivecutting．Thevegetation，litternutrientcontentandphysicalandchemicalpropertiesofsoilwereanalyzedbyconventionalmethods．Theeffectsofdifferentintensityselectivecuttingonthestandstructure，speciesdiversity，saplings

7、andseedlings，standvolumegrowth，litternutrientcontent，physicalandchemicalpropertiesofsoiletal，wereresearchedafterselectivecutting10years．Onthisbasis，thechoicesanddefinitionsofthetechnologicalfactorsofselectivecuttingofnatualforests，loggingequi