Study of conservation and proliferation of Pinus armandii var.amamiana

通过对华山松的分布和雅库什马岛的物种组成和森林结构的调查，确定了华山松的生态特性。华山松海拔900m，高于以往报道。在岩石陡峭的山脊上发现了华山松。在这些垄中，冠层由华山松和其他针叶树种组成，如铁杉、柳杉和钝顶乔木。华山松仅在冠层和冠层上层观察到苗木，在冠层以下未发现苗木。阔叶林中未发现杨梅和山毛杜鹃。这些结果表明，该松树物种未能再生。通过对华山松种子的采集，确定华山松种子产生大而无翅的种子，解释了种子主要分布在树冠下的原因。华山松胚胎期在含有BAP 1-2ppm的DCR和WS两种培养基上观察到有较好的成活率。

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.