自然教育園におけるシュロ個体群の形成過程とその生態的背景(I) : シュロの分布拡大特性

概要

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1. We surveyed the distribution of the individuals of Trachycarpus fortunei (above 0.6m in stem height) in the Institute for Nature Study in 1980,1983 and 1987. Meanwhile, in the survey of 1983,we did not check the newly established individuals. 2. We recogneized changes in the distributional pattern of T. fortunei frorn the followings; 1) The expantion based on direction towards the center of the study area. 2) The movement of the distributional center from the southwestern region to the northeastern region. 3) The maldistribution in some habitats (valley heads, sites around the swamp etc.). 4) The delay of distribution in swamp, ponds, artificial vegetation and it's remains. 3. The distributional patterns (1〜3) may have been caused by the regional difference of the chance of seed dispersals by birds and the difference in growth rate as a result of the effects of habitats and competition. 4. The distributionar pattern (4) may have been caused by few dispersed seeds or reduced establishment and growth caused by tce effects of habitats, competition and man's impact. 5. The cuttings of many individuals of T. fortunei from 1980 to 1983 by the staff of the Institute affected the trend in the appearance of new individuals of T. fortunei in 1987.
国立科学博物館の論文
1992-03-25