摘要
应用立木大小级对水青冈群落中的水青冈(Fagus longipetiolata)和青冈栎(Cyclobalanopsis glauca)两个优势种群径级结构进行了对比分析,同时采用方差/均值的t检验法、Morisita指数Iq的F检验法、丛生指数I、负二项式指数K、平均拥挤系数m*和聚块性指数m*/m判定并检验了两种优势种群的分布格局,并按径级分样地进行了格局类型及强度的比较。结果表明,在分布格局上,水青冈种群V级占优势,在3个样地中分别达到52%,49.1%,49.4%,Ⅰ级没有,Ⅱ级较少,表现为衰退种群;青冈栎种群Ⅳ级较多,Ⅰ、V级在个体数量比水青冈种群多;群落中两优势种群均呈集群分布。分析径级结构得出,随径级增大,水青冈种群由随机分布向集群分布过渡,而青冈栎种群则由集群分布向随机分布过渡。
Five indices were applied to analyze the Leigong Mountain, and based on the investigation data of 2 species diversity of Fagus longipetiolata community in quadrats , tree size class method was applied to analyze the structures of the dominant populations,, and t - test of v/m ratio, mean crowing index , negative binomial parameter, patchiness index and Morisita index were applied to analyze the spatial distribution patterns of two dominant populations. The result expresses that the species diversity of tree layer and fruticose stratum is relatively lower, while the herb layer relatively higher. However , the result of integrating the tree layer and fruticose stratum, longipetiolata population , the individual percentage of V trees accounted for 52. 0% inQ1 and 4 9. 1% in Q2 and 4 9. 4 % in Q3, The Ⅰ class has none , The Ⅱ less , for the decline population. However , the population in Cyclobalanopsis glauca The Ⅳ has more , the Ⅰ , Ⅴ are more than F. longipetiolata population on the individual quantity . The spatial distribution patterns of the two dominant populations are distributed in clumps, but the diversity exists in clumping degrees. With the increase of the size classes, the population of F. longipetiolata transits from random distribution to clumping distribution , while the population of C. glauca from clumping distribution to random distribution.
出处
《贵州林业科技》
2008年第3期18-21,共4页
Guizhou Forestry Science and Technology
关键词
雷公山自然保护区
水青冈群落
种群结构
分布格局
Leigong Mountain Nature Reserve
Fagus longipetiolata
Population structure
Spatial distribution pattern
