Community structure and population regeneration of an endangered plant, Thuja sutchuenensis.
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摘要: 本文以崖柏主要分布区大巴山保护区内崖柏为研究对象,对其群落结构、物种组成、垂直结构、种群大小级结构及种群更新状况进行调查研究,揭示崖柏群落结构、物种组成、种群更新等方面的特点。结果表明:崖柏所处生境破碎,且被分割成许多“岛屿状”局部小种群;群落中共出现伴生植物75科156属182种,其中表征科为蔷薇科、百合科、菊科、樟科、山茱萸科;无论是乔木层还是灌木层,群落的Gleason指数、Simpson指数、Shannon-Wiener多样性指数、Pielou指数均较高;崖柏群落林木层在垂直结构上可分为4层,崖柏主要处在灌木层、乔木下层和乔木中层,乔木上层基本没有分布;崖柏种群天然更新存在严重障碍,分析其年龄结构图,径级结构出现不同程度的残缺现象,更新不连续。残存崖柏群落发育在不稳定立地上,阔叶乔木的入侵给崖柏种群更新带来严重阻碍。Abstract: Evaluating community structure where those endangered plant species occur and their population regeneration are essential for planning protection strategies. Thuja sutchuenensis, a critically endangered species restricted to a single population on the southern side of the Dabashan Mountain, Chongqing, southwestern China, has received little attention so far. We conducted a field investigation into Th. sutchuenensis community on community structure, floristic composition, stratification structure, size structure population and the regeneration of Th. sutchuenensis to provide an effective reference and scientific basis for the protection and management of the remaining Th. sutchuenensis. 10 stands (size: 20 m×20 m) were selected for sampling after repeated reconnaissance based on the factors of altitude, site conditions and so forth. The results showed that the population of Th. sutchuenensis was isolated into several smaller populations because of the habitat fragmentation, and “island” pattern. The community had high level of biodiversity and species richness (182 species belonging to 156 genera and 75 families were found, most of which belonged to Rosaceae, Liliaceae, Compositae, Lauraceae, and Cornaceae families); Gleason, Simpson, Shannon-Wiener diversity and Pielou index were high in the tree layer and shrub layer. The Th. sutchuenensis was mainly distributed in the vertical structure of shrub, lower and middle layers except upper tree layer. There were serious obstacles to population regeneration of Th. sutchuenensis because of the discontinuous distribution of the diameter of individuals. Meanwhile, the remaining Th. sutchuenensis population development was in an unstable environment, and the succession of broadleaf trees led negative influences on the regeneration of Th. sutchuenensis. We conclude that obstacle to the population regeneration of Th. sutchuenensis might be caused by the invasion and development of broadleaf trees in the community. We suggest that increasing habitat connectivity and decreasing the invasion of broadleaf trees should be the priority for the effective protection of Th. sutchuenensis.
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