Study of conservation and proliferation of Pinus armandii var.amamiana

本文根据对华山松分布区的调查结果，结合对屋久岛华山松的种类组成和林分结构的调查，确定了华山松的生态学特征，华山松海拔900米，高于以往的报道。华山松在岩石和陡峭的山脊上被发现。在这些山脊中，林冠层由华山松和其他针叶树如铁杉、柳杉和钝头山慈菇组成。华山松仅在冠层和冠上层有幼苗生长，冠层以下无幼苗生长。在阔叶林中没有发现杨梅和罗豆树。这些结果表明，这种松树物种未能再生。指出华山松在树冠干扰和滑坡后繁殖，种子采集表明华山松种子大而无翅，说明种子主要散布在母树树冠下。华山松胚在含BAP 1- 2 ppm的DCR和WS两种培养基上均有较好的成活率。

The ecological charactristics of Pinus armandii var.amamiana were determined from results of the investigation of its distrbution and the species composition and forest structure of Yaku-shima island.P.armandii var.amamiana was found 900m above sea level, higher than earlier reported. P.armandii var.amamiana was found on the rocky and steep ridges. In these ridges, the canopy layr was composed of P.armandii var.amamiana and other conifers such as Tsuga sieboldii, Cryptomeria japonica and Chamaecyparis obtusa. P.armandii var.amamiana was observed only in the canopy and sup-canopy layrs, while no seedlings were found below these layrs. Myrica rubra and Rododendron metternichi var.yakushimanum were not found in the broad-leaved trees stands. These results suggests that this pine species failed to regenerate. Pointing out that P.armandii var.amamiana reproduce after canopy disturbance and land slides.From seed collection it was determined that P.armandii var.amamiana produced big and wingless seeds, explaining why seeds were mainly dispersed under the canopy of mother trees.Embryo of P.armandii var.amamiana were observed to have a good survial rate when cultured on two media, DCR and WS,containing BAP 1-2ppm.