Vegetation-environment pattern of evergreen broad-leaved forest

从热带高山热带低山带向东亚湿润的亚热带/暖温带低地带延伸的亚热带/暖温带常绿阔叶林，从林分结构、叶型、物候学和生态生理特性等方面进行了研究。本研究的目的是了解亚热带/暖温带常绿阔叶林在不同尺度上的时空格局，并最终了解这些树种的功能类型。首先，对东亚常绿阔叶雨林进行了地理分析，发现在东亚日益潮湿的环境中，以温度和值表示的能量因子既控制着森林结构，又控制着物种丰富度。森林的地形分布格局在很大程度上取决于物种之间的竞争相互作用以及生态生理限制。常绿阔叶树之间的竞争关系与树叶大小密切相关，也就是说，常绿阔叶树是小叶还是无叶。因此，常绿植物的各种生态行为，如演替行为、地形分布、沿胁迫梯度的分布等，都很好地对应于叶大小类别。这些方面的生态生理原因仍在利用便携式光合作用测量仪、压力室、土壤水分测量仪等进行着。

The subtropical/warm-temperate evergreen broad-leaved forests which extend from tropical lower montane belt on tropical high mountains toward subtropical/warm-temperate lowland zone of humid east Asia were studied in terms of forest structure, leaf type, phenological aspects, and ecophysiological traits. The objectives of this study are to understand causatively the spatial and temporal pattern of the subtropical/warm-temperate evergreen broad-leaved forests at various scales, and eventually to get some idea on functional types of those tree species. I have conducted, firstly, geographical analysis of the evergreen broad-leaved rain forests in east Asia, and have foud that the energy factor expressed as temperature sum value controls both forest structure and species richness in ever-humid east Asian environment. The topographical distribution pattern of the forest is largely dependent on competitive interactions among species as well as ecophysiological constraints. The competitive interrelationships among evergreen broad-leaved trees are well correlated to the leaf size, i.e., whether the tree is microphyllous or notophyllous. Therefore, various ecological behavior of the evergreens, e.g., the successional behavior, topiographical distribution, distribution along stress gradients, etc., are all well correspond to the leaf size category. Ecophysiological causation for these aspects are still going on by using portable photosynthesis measuring instrument, pressure chamber, soil moisture measuring instruments etc.