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首页> 外文期刊>Journal of Plant Research >Stand structure and woody species diversity in relation to stand stratification in a subtropical evergreen broadleaf forest, Okinawa Island
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Stand structure and woody species diversity in relation to stand stratification in a subtropical evergreen broadleaf forest, Okinawa Island

机译：与冲绳岛亚热带常绿阔叶林林分结构相关的林分结构和木质物种多样性

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摘要

Stand structure and woody species diversity in a subtropical evergreen broadleaf forest grown in a silicate habitat, Okinawa Island, have been investigated on the basis of stand stratification. The forest stand consisted of four layers. The floristic composition of the top and the lower three layers was only slightly similar, although approximately one-third of the species were common to them. Mean tree weight decreased from the top toward the bottom layer whereas tree density increased from the top downward. This trend resembled the mean weight-density trajectory of self-thinning plant populations. The relationship between mean tree height and tree density for the upper two layers supported Yamakura's quasi -1/2 power law of tree height. The values of the Shannon-Wiener index, H', and the equitability index, J', tended to increase from the top layer downward except for the bottom layer. The values of H' and J' were, respectively, 4.83 bit and 0.82 for trees taller than 0.10 m. The lower layers contained many species of smaller height. High species diversity of the forest depended on small trees in the lower layers. Conservation of small trees in the lower layers, especially the bottom layer, is indispensable for sound maintenance of Okinawan evergreen broadleaf forests.
机译：在林分分层的基础上，对在硅酸盐生境冲绳岛上生长的亚热带常绿阔叶林的林分结构和木质物种多样性进行了研究。林分四层。上三层和下三层的植物区系成分仅略有相似，尽管大约三分之一的物种是它们共有的。平均树重从上到下降低，而树密度从上到下增加。这种趋势类似于自我稀疏植物种群的平均重量密度轨迹。上部两层的平均树高与树密度之间的关系支持了山仓的树高准-1/2幂定律。香农-维纳指数H'的值和当量指数J'的值从顶层向下（底层除外）有增加的趋势。对于高于0.10 m的树木，H'和J'的值分别为4.83位和0.82。下层包含许多较小高度的物种。森林的高物种多样性取决于下层的小树。较低层特别是底层的小树木的保护对于冲绳常绿阔叶林的良好维护是必不可少的。

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