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1、应用与环境生物学报2003,9(6):563~568ChinJApplEnvironBiol=ISSN1006687X20031225*元宝山两类森林群落的乔木物种多样性**欧祖兰李先琨苏宗明向悟生(中国科学院广西植物研究所广西桂林541006)摘要对元宝山保存的广西最古老、最原始、最完整的常绿落叶阔叶混交林和针阔混交林进行了乔木层物种多样性研究.结果表明:1)两类群落的物种多样性特征和群落各物种的重要值变化以及群落优势度反映出来的特征相一致;22)物种重要值和个体数作为测度指标所得结果相近;3)随着面积由500~3000m的变化,物种多样性指数差异不大,
2、标准差和变异系数均较小,在不受面积大小影响,正确反映群落多样性方面,Shannon-Wiener指数优于Simpson指数;4)常绿落叶阔叶混交林和针阔混交林的多样性指数均较高,Shannon-Wiener指数分别为5.3507和4.5395,与北热带季节性热带雨林、南亚热带季风常绿阔叶林和中亚热带典型常绿阔叶林物种多样性比较,未表现出明显的纬度梯度特征.图4表4参20关键词元宝山;原生状态;常绿落叶阔叶混交林;针阔混交林;乔木层;物种多样性CLCS718TREESPECIESDIVERSITIESOFTWOFORESTCOMMUNITIES*INYUANBAOMOUNTAIN**
3、OUZulan,LIXiankun,SUZongming&XIANGWusheng(GuangxiInstituteofBotany,ChineseAcademyofSciences,Guilin,Guangxi541006,China)AbstractTreespeciesdiversitiesofevergreen-deciduousbroadleavedforestandconiferousbroadleavedforestintheYuanbaoMountainwhicharethemostantient,primalandintactforestsinGuangxiw
4、erestudied.Theresultsshowedthat(1)thetreespeciesdiversitycharactersofthetwocommunitiesaccordedwiththecharactersreflectedbytheirspeciesimportancevaluevariationandcommunitydominanceindex;(2)theresultsweresimilartothosewhenIV(importantvalueindex)andindividualswereusedtomeasurecommunitydiversity;(
5、3)thediversityindicesdidnotshowevidentdifferencewithvariation2from500~3000moftheplotarea,especiallyShannon-Wienerindex,whichindicateditwassuperiortoSimpsonindexintheaspectofcommunitydiversity;(4)thediversityindicesinevergreendeciduousbroadleavedforestandconiferousbroad-leavedforestwerebothhigh,
6、comparedwiththoseofthenorthtropicalseasonalrainforestinYunnanProvince,thesouthsubtropicalseasonalmonsoonevergreenbroadleavedforestandmedsubtropicaltypicalevergreenbroadleavedforestofGuangdongProvince,indicatingthatthespeciesdiversityhadnoevidentcharacterofaltitudegradient.Fig4,Tab4,Ref20Key
7、wordsYuanbaoMountain;primarystatus;evergreendeciduousbroadleavedforest;coniferousbroadleavedforest;treelayer;speciesdiversityCLCS718对我国亚热带常绿阔叶林物种多样性的研究已有不少报1自然环境概况[1~3]导,但多数研究对象为季风常绿阔叶林和典型常绿阔叶林元宝山自然保护区位于广西北部的融水县境内,地处
