摘要
对保护区不同经营强度下的毛竹林的物种组成、α多样性及 β多样性进行研究 ,并与 3个天然植被类型进行对比分析。结果表明 ,毛竹林随着经营强度加大 ,明显表现纯林化过程 ,这一过程以丧失大量壳斗科、樟科和松科等乔木树种为代价 ,乔木层、灌木层和草本层的物种组成发生显著的变化。乔木层物种多样性下降 ,灌木层和草本层物种多样性上升 ,灌木和草本物种多样性变化是由于乔木层改变引起的。β多样性反映毛竹林在不同经营强度条件下物种替代速率 ,从毛竹混交林Ⅱ (c类型 ,2 5 %≤毛竹 <5 0 % )向毛竹混交林Ⅰ (b类型 ,5 0 %≤毛竹 <75 % )转变过程中 ,乔木层Sorenson指数最小 ,Cody指数最大 ,说明阔叶或针叶树种在这一过程中大部分已被改造而丧失 ,对保护区物种多样性保护 ,在此阶段之前加以控制和保护才更有现实意义。
Plant community composition and species diversity were described in the different cultivation intensities of bamboo forest in Fujian Wuyishan National Nature Reserve. The data was compared with that of three types of natural vegetation (evergreen broad-leaved forest, coniferous and broad-leaved mixed forest, bamboo and coniferous/broad-leaved mixed forest). The results showed that great composition changes of the tree layer, the shrub layer and the herb layer were observed at different stages of bamboo cultivation, which involved the loss of many species in the tree layer such as Fagaceae, Lauraceae and Pinaceae. Species diversity of the tree layer decreased, while those of the shrub layer and herb layer increased differently along with the purified stages of bamboo cultivation. Species diversities of the shrub layer and herb layer were greatly influenced by the tree layer. β diversity corresponded to the change rate of species along the cultivation intensity gradient of bamboo forest. The lowest value of Sorenson index and the highest value of Cody index of the tree layer were recorded from type Ⅱ of the bamboo mixed forest (c, 25% ≤ bamboo < 50%) to type Ⅰ of the bamboo mixed forest (b, 50% ≤bamboo < 75% ). Most of the tree species had lost their distribution during this stage. To this point of view, it is very important for the Reserve to take action to protect the species diversity and control the loss of tree species before the stage of occurrence.
出处
《生态学杂志》
CAS
CSCD
北大核心
2003年第6期1-6,共6页
Chinese Journal of Ecology
基金
国家林业局中国自然保护区全球环境基金管理项目 (GEF)小型科研基金资助 (GEFSRG980 2 )
关键词
毛竹林
经营强度
群落组成
多样性
武夷山
bamboo forest, different cultivation intensity, community composition, biodiversity, Wuyishan
