福建三明不同更新方式的米槠林群落结构特征

 为了解采伐迹地米槠林群落的演替恢复过程,通过野外标准地群落调查和重要值计算,分析了福建三明不同更新方式的米槠林群落结构特征。主要结果如下:1)3个标准地共调查到乔木有天然更新13科16属20种;人促更新5科6属6种;人工造林1科1属1种。2)不同更新方式的米槠林落群中米槠种群径级分布呈天然更新:低径级的个体占的比重较大,随径级增大,立木株减少;人促更新:低径级个体占的比重极小,而中、高径级个体占的比重极大;人工造林:呈正态分布。3)不同更新方式的米槠林群落中米槠种群的垂直结构呈天然更新:自上而下的递增趋势;人促更新趋于正态分布;人工造林服从正态分布。3种更新方式的米槠林群落中的物种丰富度为天然更新>人促更新>人工造林。

Community structure characteristics of C. carlessii forest under different regeneration patterns at Sanming in Fujian province

In order to know the succession and renovation process of C.carlessii forest community at cut-over land,based on community investigation of three sample plots in field and calculation key value,the community structure characteristics of C.carlessii Forest under different regeneration patterns at Sanming in Fujian Province are analyzed.The results showed that 13 families,16 genera and 20 trees species were natural regeneration(N.R.),5 families,6 genera and 6 trees species were artificial measures promoting regeneration(A.M.P.R.),1 family,1 genera and 1 specie are artificial generation(A.R.).The effects of DBH of different regeneration patterns of C.carlessii forest are as following: trees of small DBH are more than trees of big DBH in N.R.stand;trees of big DBH are more than trees of small DBH in A.M.P.R.stand;trees of small and big DBH are less than trees of middle DBH in A.R.stand.Spatial distribution of different regeneration patterns C.carlessii N.R.stand has a tendency increasing progressively from the upper to the lower.A.M.P.R.stand tends to normal distribution.N.R.stand is subject to normal distribution.The species richness in different regeneration patterns of C.carlessii forest is N.R.stand>A.M.P.R.stand>A.R.stand in turn.