岑王老山常绿落叶阔叶混交林的物种组成及多样性特征

Species Composition and Diversity Characteristics in Evergreen and Deciduous Broad leaved Mixed Forests of Mt.Cenwanglaoshan

常绿落叶阔叶混交林是我国亚热带中山区的典型森林植被,也是广西边缘山地至今保存最好的森林植被类型之一,具有重要的生物多样性保护价值和生态服务功能。本文以5个1 hm^2的大样地为对象,对胸径≥1 cm的林木进行全面调查,分析岑王老山常绿落叶阔叶混交林群落的物种组成及多样性特征,结果表明:单个1 hm^2样地统计,胸径≥1 cm的木本植物变化为149-196种,个体数变化为2114-4646株/hm^2。5个1 hm^2样地统计,胸径≥1 cm的木本植物共有52科147属389种,总个体数为18205株。单个1 hm^2样地统计,岑王老山常绿落叶阔叶混交林群落重要值居前10的物种中,常绿阔叶树和落叶阔叶树分别占总株数的74%和26%,占总重要值的77%和23%;按照群落上层重要值居前10的物种统计,常绿阔叶树和落叶阔叶树分别占总株数的48%和52%,占总重要值的56%和44%。岑王老山常绿落叶阔叶混交林群落的物种数高达389种,高出海南尖峰岭热带雨林物种数100种,表明其植物种类是极其丰富的。同时也说明多点非连续大样地对群落物种丰富度的表达要比单点连续大样地更全面。

Evergreen and deciduous broad leaved mixed forest is a typical forest vegetation in the subtropical mountain area of China.It is also one of the best preserved forest vegetation types in the marginally mountainous areas of Guangxi up to now.It has important biodiversity conservation value and ecological service function.In this study,five large plots of 1 hm^2 were taken as the object to conduct a comprehensive investigation on the forest trees with DBH≥1 cm,the species composition and diversity characteristics in evergreen and deciduous broad leaved mixed forest communities in Mt.Cenwanglaoshan were analyzed.The result showed that for the woody plants with DBH≥1 cm,the species richness varied from 149 to 196 and the number of individuals varied from 2114 to 4646 plants/hm^2 according to the statistics of a single 1 hm^2 plot.According to the statistics of five 1 hm^2 plots,for the woody plants with DBH≥1 cm,there were 389 species belonging to 147 genera and 52 families,and the total number of individuals was 18205.According to the statistics of a single 1 hm^2 plot,among the top 10 species in the evergreen and deciduous broad leaved mixed forest communities in Mt.Cenwanglaoshan,evergreen broad leaved trees and deciduous broad leaved trees accounted for 74%and 26%of the total number of plants,respectively,accounting for 77%and 23%of the total important value.According to the statistics of the top ten species with important values in the upper layer of the community,evergreen broad leaved trees and deciduous broad leaved trees accounted for 48%and 52%of the total number of trees,respectively,and accounted for 56%and 44%of the total important values.The number of species in the evergreen deciduous broad leaved mixed forest community in Mt.Cenwanglaoshan is as high as 389,which is 100 species higher than that in Jianfengling tropical rainforest in Hainan,indicating that the plant species are extremely rich.These results also indicate that the expression of the community species richness in multi point discontinuous large plots is more comprehensive than that in single point continuous large plots.