武夷山常绿阔叶林若干优势树种的生态位分析

武夷山保存了世界同纬度带最完整、最典型、面积最大的中亚热带原生性森林生态系统，探讨优势树种的竞争关系及其在群落演替中的作用，对保护武夷山常绿阔叶林具有重要意义。采用Shannon-Wiener指数和Pianka指数对武夷山常绿阔叶林固定样地乔木层的11个优势树种的生态位进行分析。结果表明，优势树种的生态位宽度值介于0.60－1.02之间，大部分树种的生态位宽度值较大，且非常接近。重要值与生态位宽度值之间没有明显的正相关关系。55个生态位重叠值介于0.14－0.89之间，生态位重叠值普遍较高，大于0.5的占63.6％。群落处于恢复演替阶段，许多优势树种对资源的需求相近，种间竞争关系激烈。

Analysis of niches for several dominant tree species in evergreen broadleaved forest in Wuyishan

Wuyishan retains the primary forest ecosystem in mid-subtropical zone, which is the most perfect and typical with the largest area in the same latitude zone of world. It has great significance for conservation of Wuyishan evergreen broadleaved forest to study the competitive relationship of dominant tree species and their effects on community succession. The Shannon-Wiener and Pianka indices were collected to analyze the niche features of 11 dominant species in tree layer of subtropical evergreen broadleaved forest in Wuyishan Forest Dynamic Plot, Fujian Province, Southeastern China. The results showed as follows. The niche breadth values of dominant tree species were between 0.60 and 1.02, and most of them were large, and close to each other. There was no significant positive correlation between niche breadth values and importance values. The 55 niche overlap values were between 0.14 and 0.89 and generally high, and those higher than 0.5 accounted for 63.6%. This community was in the restoration and succession period, and the demands for resources of many species were quite similar, and their interspecific competition was fierce.