5年自然恢复前后单性木兰群落的比较研究

Comparative Study on Community Natural Recovery of Kmeria septentrionalis Dandy(Magnoliaceae) after 5 Years

应用固定监测样方法对5年自然恢复前后的单性木兰群落进行了系统全面的调查,分析了单性木兰群落的物种组成、物种多样性和群落结构的变化。结果表明,(1)组成群落的植物科、属、种数量均有所减少,但物种个体数量却明显增加;(2)乔木、灌木层物种多样性变幅较大,草本层则波动不大,群落还处于初期演替阶段,各物种间竞争强烈,一些下层阳性物种正在消失,中性、耐阴性物种在不断补充,群落物种多样性变得更加复杂;(3)濒危植物单性木兰的密度、盖度和重要值明显增加,单性木兰对自然环境有较强的适应性,在群落中的优势地位不断加强,群落正向着以单性木兰为主要建群种的方向发展。

We used a fixed monitoring sample method to conduct a systematic and comprehensive investigation to community natural recovery of Kmeria septentrionalis,analyse community species composition,species diversity and community structure in the process of 5-year succession for the plants K.septentrionalis.The results showed that：（1）The number of families,genera and species in the community decreased significantly,but individuals in a certain species were increased obviously.（2）Species diversities of trees and shrubs changed significantly,while herb layer fluctuation is not obvious.The community succession is still in an early restoration stage.The interspecies competition was strong.Some light demanding tree species in substrate are disappearing,yet neutral shade and tolerant species are keeping on adding,and community species diversities are become more complicated.（3）The species density,cover and important value of endangered K.septentrionalis increased dramatically.K.septentrionalis have strong adaptability to the natural environment,and the status of dominance in the community has been continuously strengthened.The community is developing in the direction of K.septentrionalis to be main constructive species.