古田山中亚热带常绿阔叶林木本植物多样性与优势种群格局分析

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1、古田山中亚热带常绿阔叶林木本植物多样性及优势种群格局研究ABSTRACTAcentralissueincommunityecologyishowbiodiversitycanbemaintainedinaforestandhowspatialpattemofbiodiversitycanbeshaped．Manytheoriessuchasdensity—dependenceeffect，nichetheoryandneutraltheoryhavebeenevaluatedintropicalrainforest．However,thereareonlyahandfu

2、lofsimilarstudiesonsubtropicalbroad—leavedevergreenforest．Basedontheoperationguideofcenterfortropicalforestscience(CTFS)，four20．25hm2large，long．termmonitoringforestplotshavebeenestablishedinChina．Inordertoreavelcommunitystructureandthemechanismoftheirformationandmaintenance，andhowdiffere

3、ntspeciescoexistinsubtropicalbroad·leavedevergreenforest，weexaminethediversity，structureandspatialpatterninthe24hm2permanentplotinthemid—subtropicalbroadleavedevergreenforestatGutianshan，ZhejiangProvince，China．Themainresultsareasfollows：Weanalyzedthe口一diversityof159woodspecies(DBH>l0mm)i

4、nthepermanentplot．Theresultshowsthat：Intheverticalstructureofcommunity，thevariousindicesofdiversitybetweenthecanopylayerandthesub—treelayerhaveslightdiferences．Thespeciesrichnessandspeciesdiversityindexofthecanopylayerandsub—treelayerareobviouslylargerthanthoseoftheshrublayer．Theminimala

5、reasdeterminedbyspecies—areacurvewereconsistentlyaround4-6．25hm2，beingtoolargetobeappliedinthemountainousareaswithcomplextopographies．III古田山中亚热带常绿阔叶林木本植物多样性及优势种群格局研究Comparedtothespecies—areacurve，theimportantvalue—areacurvecouldfullyandobjectivelyreflectthepositionsandrolesofdifferentspe

6、ciesplayingintheplantcommunities．Soitwasmorehelpfultodeterminingtheminimumareaofplantcommunities．Consequently，theminimalsamplingareaforsubtropicalevergreenbroad—leavedforestintheGutianshanforestplotwasdeterminedtobe2．25hm2．TheDBHsizestructureofdominantspeciesshowsareversal3type．RipleyK(d

7、)statisticswasusedtoanalyzethespatialpattemsofdominantspecies．Theresultsshowedthatclusteringdistributionacrossarangeofscales(0～lOOm)．Thesmall-treestendtobemoreclumpedthanmid—andlarge—trees．SpatialpatternsofNeolitseaauratavar．chekiangensis,Camelliachekiang-oleosa,Chimonant