片断化对常绿阔叶林种类组成的影响

Effects of Fragmentation on the Species Composition of Evergreen Broad-leaved Forests

森林片断化可能对植物群落带来不利影响,该文调查片断化、半岛型和连续常绿阔叶林的物种丰富度和物种组成来衡量片断化的影响。片断化林地比相同面积的连续森林有更高的物种丰富度,物种丰富度最低的是半岛型样地。片断化林地和半岛型林地含有较多的外来种。结果表明,片断大小与物种丰富度有关,同时周围生态系统类型、经历片断化时间也影响物种丰富度和组成。干扰程度较高的半岛型林地中藤本植物很少,反映了林地质量较差,表明藤本植物可能可以作为我国东部人类干扰地区常绿阔叶林保护和管理的指示种。

Forest fragmentation may lead deleterious consequences for plant community. Species richness and composition of fragmented, peninsular and continuous evergreen broad-leaved forests were investigated to evaluate fragmentation effects. Fragmented forests contain more species than continuous forests with comparable areas. Species richness is lowest in peninsular plots. Peninsular forests have few or comparable species richness. There are more exotic species (cultivated and escaped) in fragmented and peninsular plots than in continuous forests. Our study shows that patch size plays important role in species richness and composition. However, the surrounding matrix, time experiencing fragmentation and human disturbance also affect the plant species richness and composition. Liana is very low in disturbed peninsular forests and reflects the worse forest quality. It may be a useful indicator for conservation and management of evergreen broad-leaved forests under intensive human disturbance areas in eastern China.