木荷马尾松人工林不同恢复阶段物种多样性研究

Study on species diversity in different successional series of Schima superba and Pinus massiniana artificial forest

以空间代时间法,对中亚热带区域的木荷马尾松人工林的物种多样性进行研究,以乔木种的重要值为指标进行聚类分析,将群落划分为4个恢复阶段.研究结果表明,随着时间的推移,群落的α多样性指数基本上逐渐增大,且乔木层相应的多样性指数均小于灌木层的,而草本层的变化规律不明显.群落恢复时间最长、物种多样性最高的第4阶段的Shannon-W iener指数、Simpson指数和均匀度指数分别仅为1.566、0.611、0.578(乔木层)和3.420、0.960、0.933(灌木层),远远低于其它同类天然次生林的.

Adopting the concept of space as a substitute for time, the species diversity of mid-subtropical Schima superba and Pinus massiniana plantations at different restoration stages were studied. The community was divided into 4 restoring phases by the analyses of hierarchical cluster with the IV indexes of arbor layers. The result shows that, a-species diversity index of community become larger gradually, thediversity index of arbor layer is smaller than the shrub layer＇s, and the changing rules of herbage＇s isn＇t obvious. The 4th phaserestoring time is the longest and it＇s species diversity is the most, but it＇s Shannon-Wiener index, Simpson index and Pielou index are 1. 566, 0. 611, 0. 578 （ arbor layer） and 3.420, 0. 960, 0. 933 （ shrub layer）, which are much smaller than the same kind of natural communities.