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、坡度等微地形影响。对地形的依赖因物种和个体大小而异。由于上坡受台风和季风强风的影响，下坡受洪水和滑坡的影响，扰动形式随着地形的变化而变化。干扰机制的变化可以创造栖息地的多样性，有助于保持冲绳岛常绿阔叶林的物种多样性。各树种树干形状的差异可能是其适应不同地形的原因之一。琉球大学林区亚热带常绿阔叶林1980~2000年蓄积量的变化数据是基于数据的。这一数据是从常绿阔叶林的70块地块中收集的。根据《国际生物多样性观察年》(IBOY)手册，于2003年6月、9月和2004年1月、4月在常绿阔叶林中采集了无脊椎动物。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.