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、坡度等微地形的影响。对地形的依赖性因物种和个体大小而异。扰动机制随地形变化而变化，上坡受台风和季风大风影响，下坡受洪水和滑坡影响。干扰状况的变化可以创造生境多样性，有助于维持冲绳万年青林较高的物种多样性。根据1980 ~ 2000年琉球大学森林亚热带万年青林蓄积量变化的资料，分析了不同树种对不同地形的适应性。在万年青林的70个样地收集数据。2003年6月和9月、2004年1月和4月，根据国际生物多样性观测年（IBOY）的要求，在万年青林中采集了2003年6月和9月、2004年1月和4月的底栖无脊椎动物。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.