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

华山松种子生产。1995-1999年在雅库岛哈沙山对鹅膏蕈蚊（amamiana）进行了5a的调查。结实率为22.0%~ 32.9%，各年份间差异不显著。每棵树的球果数约为10个，每个球果仅含10粒种子。结果表明，该树种的种子生产力很低，说明该树种在研究区的森林地面上几乎没有幼苗或幼树。从塔内岛的死树中检测到松材线虫，但自然干扰（例如：结果表明：崖崩是造成雅库岛树木死亡的主要因素，对球果和种子性状进行聚类分析，发现两岛之间存在显著差异，这与同工酶分析结果相吻合，雅库岛与丹内岛之间同工酶分析结果和种子性状存在显著差异，因此，我们推测该松种的长距离迁移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.