云锦杜鹃等3种野生杜鹃花属植物在广东天井山苗期生长特性研究

Growth Characteristics Study on Three Rhododendrons Species in Tianjingshan Region in Guangdong Province

对云锦杜鹃（Rhododendron fortunei）、毛棉杜鹃（R．moulmainense）和刺毛杜鹃（JR．championae）3种野生杜鹃花属植物在广东天井山林场的生长特性包括种子发芽、幼苗形态建成及苗木生长节律进行大田观测，结果表明：云锦杜鹃、毛棉杜鹃和刺毛杜鹃种子成熟度较好，平均发芽率分别为77．83％、65．83％、83．34％，可以用种子进行苗木繁殖；幼苗形态建成较为缓慢需80～95d，为播种繁殖的关键期。3种植物生长期约为10个月，高生长集中在3月下旬至9月中旬，9月中旬至11月下旬进入缓慢生长期，12月下旬基本停止生长进入休眠期。刺毛杜鹃在12月下旬是否完全进入休眠期有待进一步研究。

The seed germination, seedling morphogenesis and plant growth rhythm of three wild Rhododendron species, Rhododendron fortuneL R. moulmainense and R. championae, were observed under the condition of field observation on Tianjingshan forest farm in Guangdong province. The results showed that the maturity of three wild plants of Rhododendron seeds were better and the average germination rate of R. fortunei, R. championae and R. moulmainense were 77.83%, 65.83% and 83.34% respectively, which were feasible to be used as seeds breeding. The seedling morphogenesis was relatively slow and would take 80 to 95 days, which was the critical period for sowing and breeding. The growth period of seedlings of three species was ten months, and the height-growth mainly concentrated on late March of middle September. In middle September to late November, there was a slow-growing stage. They nearly stop growing and get into a dormancy period in late December. However there need further research to make out that whether the seedlings of R. moulmainense become dormant in late December.