大东山长柄双花木群落主要种更新生态位研究

在野外调查基础上，应用改进的更新生态位宽度和更新生态住重叠计算公式研究了南岭大东山潘家洞长柄双花木群落乔木层、灌木层主要种的更新生态位。结果表明，乔木层重要值以黄山松和马尾松的最大，灌木层以长柄双花木的最大。更新生态位宽度以长柄双花木的0．26最大。长柄双花木与其他树种的更新生态位重叠值为0．09～0．66，表明它们存在资源共用，其中与毛棉杜鹃和睫毛杨桐的更新重叠值较大，分别为0．66和0．53，与这2个物种可能存在竞争排斥作用。建议采用人工抚育措施以促进长柄双花木的幼苗更新，维持群落稳定。

Studies on the Regeneration Niche of Main Species in Disanthus cercidifolius var. longipes Conununity in Dadongshan,Nanling Mountain

Based on the field survey data, using improved models of regeneration niche width and niche overlap, the regeneration niche of main species in the Disanthus cercidifolius var. longipes community in Dadongshan, Nanling Mountain was studied. The results showed that the important value of Pinus taiwanensis and P. massoniana were highest in the arbor layer while the import/mr value of Disanthu~ cercidifolius var. longipes was the biggest in the shrub layer. The regeneration niche width of D. cercidifolius var. longipes was 0.26, which was the highest one among all the species. The regeneration niche overlap between D. cercidifolius var. longipes and other species ranged from 0.09 to 0.66, which indicated that D. cercidifolius var. longipes and other species shared common resource utilization spectrum. Among them, the regenera- tion niche overlap between D. cercidifoliu~ var. longipes and Rhododendron moulmainense, Adinandra glischroloma were 0.66 and 0.53, re- spectively, these higher values suggested that they may had obvious competition and rejection effects. Some management should be taken to enhance the survival of seedlings and saplings of Disanthus cercidifolius var. longipes for making the community stable.