Ecological genetics and socioecological studies for the conservation of wild three-leaved azalea

通过访谈和实地调查，研究了三叶杜鹃的分布变化。过去广泛的分布在山区缩小了。从1970年到1985年，随着木炭产量的减少和水库和公路网的发展，农村的生活方式发生了很大的变化。三叶杜鹃花作为园林植物的需求不断增加，从80年代末S开始商业化生产以来，天然树苗的价值开始下降。三叶杜鹃花生长在第三系砂岩和泥岩带上。膨胀杜鹃自然生境陡峭，土层薄。红山杜鹃复盖厚厚的土壤，乔木层发育。由于灌木管理的停止，杜鹃的安全建植地点减少，导致杜鹃幼树稀少，两种杜鹃在自然栖息地和乡村花园进行了杂交对比。8%的个体在自然生境中表现出中间属性。27%的个体在花园中表现出中间属性。基因分析证实为天然杂交。这些物种的杂交应经常在花园中进行，那里的植物是高密度混合种植的。

The changes of distribution of three-leaved azalea were studied through the interview and field survey. The past wide distribution was shrinked in the mountain area. Transplanting from native habitat was boomed since 1970 to 1985, when the rural life style was quite changed by the reduce of charcoal production and the development of reservoir and road network. The demand of three-leaved azalea as garden plant was increased and stolen from natural habitat.Since the late 80's, the commercial production was started and the value of natural sapling was decreased. The transplanting from habitat was consequently reduced.Three leaved azalea grows on the tertiary zone with sand stone and mud stone. The natural habitat of Rhododendron dilatatum was steep with thin soil-layer. That of Rhododendron kiyosumense was covered with thick soil and tree layer was developed. The saplings of Rhododendron dilatatum was few due to the reduction of safe site for establishment, because the stop of coppice management.The hybridization of two species was compared between the natural habitat and the rural garden. 8% of individuals showed intermediate properties in natural habitat. 27% of individuals showed intermediate properties in garden. Natural hybridization was confirmed through gene analysis. Hybridization of these species should occur often in the garden, where the plants were mixed-grown with high density.