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ID:39131525
大小:2.63 MB
页数:54页
时间:2019-06-25
《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》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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
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