Conservation of Pinus armandii var. amamiana based on the information about genetic variations.

华山松种子生产技术。在雅库岛哈沙山对菊科植物进行了长达5年(1995~1999年)的调查。结实率为22.0%~32.9%，年际间差异不显著。每株球果数为10个左右，每个球果仅含10粒种子。这些结果说明该松种的制种能力很低，说明该树种在研究区森林地面上的幼苗或幼树很少。连续5年统计死树数量，以揭示该松种在雅库岛和丹内岛的致死因素。在Tane岛的枯死树上发现了松材线虫，但自然干扰(例如.球果和种子性状的聚类分析表明，这两个岛屿之间存在显著差异，这与同工酶分析的结果相吻合。亚库岛和坦恩岛的同工酶分析和种子特性存在显著差异，因此我们推测这一松种的远距离迁徙导致了遗传变异的污染。

Seed production of Pinus aramandii var. amamiana was investigated for 5years (1995-1999) at Hasha mountain in Yaku island. The percentages of seed produced trees were 22.0〜32.9%, and there were not significant differences among years. The number of cone per tree was about 10, and each cone contained only 10 seeds. These results say that the seed production ability of this pine species is very low, and explain that there little seedlings or saplings of this pine species on the forest floors in this research area.The dead tree numbers were counted for five years to reveal the lethal factors of this pine species at Yaku island and Tane island. Pine wilt disease nematode was detected from the dead tree in Tane island, but natural disturbances (ex. Cliff collapse) were main factors of tree death in Yaku island.Cluster analysis of cone and seed characters said that there ware significant differences between these two islands, and these results were coincided with those of the isozyme analysis.There were significant differences about isozime analysis and seed characteristics between Yaku island and Tane island, therefore we suppose that the long distance movement of this pine species leads to the contamination of genetic variation.