武夷山天然米槠林优势种群结构与分布格局

在武夷山国家级自然保护区以米槠、杨梅叶蚊母树罗浮栲和黄瑞木为优势的群落内，应用相邻格子法设置3600m^2样地获得野外调查资料，进行优势种种群结构和空间格局的研究。结果表明：1）米槠杨梅叶蚊母树、罗浮栲和黄瑞木种群结构呈金字塔型。2）在分格格局上，四种优势种群都呈集群分布，但聚集强度不同，K值为0．2661－1．2877；在不同发育阶段米槠种群的空间分布格局都呈集群分布；杨梅叶蚊母树、罗浮栲种群，大树呈随机分布，幼树、中树均为集群分布；黄瑞木种群幼树为集群分布，中树则为随机分布；这种差异与其生物生态学特性及与物种的竞争排斥作用有密切联系。3）不同区组对种群空间分布格局产生影响。

The Structure and Distribution Pattern of Dominant Populations in Castanopsis carlesii Community

Populationstructureandspatialdistributionpatternwereinvestigatedin a3600m 2 plotof forest communitydominatedby Castanopsis carlesii,C.fabri,Distylium myricoides and Adinandra millettii inWuyishanStateNatureReserve,Fujian,China.Methodof Tallywithcontiguousgridquadrats wasusedto analyzefielddataobtained.Theresultsindicatedthatthepopulationsof thefourspecieshad a greatamountof reserveseedlings.Spatialdistributionpatternof thesedominantpopulationsappeared to haveclumpingdistribution,buttheclumpingintensityshoweddifferenceswithK values(negative binomialdistributionindex)from0.2661to1.2877.Castanopsis carlesii populationat different developmentalstagesallshowedclumpingdistribution,whileD.myricoides and C.fabri exhibited randomdistributionfor largetrees,and clumpingdistributionfor saplingsand mediantrees.As for Adinandra millettii,populationrandomdistributionwasshowninmediantrees,andclumpingdistribution in saplings.Suchdifferencesaredueto thebiologicalandecologicalcharacteristicsof thespeciesand thecompetitiveexclusionprinciple.Variesplotsizeshadalsoan effecton spatialdistributionpattern.