A Fundamental study for conservation of species diversity in a subtropical evregreen forest in Okinawa Island

树种分布受地形起伏、倾斜等微地形的影响。对地形的依赖随物种和个体大小的不同而不同。扰动形式随地形变化而变化，上坡受台风和季风强风的影响，下坡受洪水和滑坡的影响。干扰状态的变化可以创造栖息地多样性，并有助于保持冲绳岛常绿阔叶林物种的高度多样性。不同树种树干形状的差异可能是对不同地形的适应之一。1980 - 2000年琉球大学森林亚热带阔叶常绿森林的体积变化数据基于数据。数据采集于常绿阔叶林的70个样地。2000年的数据为单株普查。根据国际生物多样性观测年（IBOY）手册，于2003年6月和9月、2004年1月和4月采集了常绿阔叶林的地上无脊椎动物。收集的样本保存在琉球大学的实验室中，正在进行鉴定。

Tree species distribution depended on the micro-topography such as relief and inclination. The dependence on the topography varies with species and individual size. The disturbance regime is thought to be variable with topography as upper slope is affected by strong wind of typhoon and monsoon, and lower slope is affected by flood and land slide. The variation in disturbance regime can create habitat diversity, and help to maintain the high species diversity in the broad-leaved evergreen forest in Okinawa Island. Difference in trunk shape of each tree species might be one of the adaptations to the different topography.The date for changes in volume of the subtropical broad-leaved evergreen forest in Ryukyu University Forest during from 1980 to 2000 was data based. The date was collected from 70 plots in the broad-leaved evergreen forest. The data in 2000 was arranged for individual tree census.Aboveground invertebrate were collected in according to the International Biodiversity Observation Year(IBOY) manual in the broad-leaved evergreen forest in June and September 2003, and January and April 2004. The collected samples are preserved in a laboratory of University of the Ryukyus and are under identifying.