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The Life Table and Dynamics of Populations of Monimopetalum chinense, an Endangered Plant

濒危植物永瓣藤的种群生命表与动态分析*


在永瓣藤模式标本产地安徽祁门县棕里村设置4块样地,应用相邻格子法调查获取野外资料。对永瓣藤种群进行统计,编制种群的特定时间生命表、绘制存活曲线,并应用理论分布模型和聚集强度指数分析种群分布格局。结果表明: 1) 由于群落环境因子的差异,不同永瓣藤种群的静态生命表和存活曲线存在差异。总体而言,棕里村永瓣藤种群以幼龄个体数量最多,中龄级别个体数量稍减,老龄个体最少,种群更新情况良好。2) 不同样地的种群格局强度存在一定的差异,聚块规模大体位于4 m2或16 m2附近。不同发育阶段种群空间分布格局有差异,幼龄个体大多为集群分布,在从幼龄→老龄的时间序列上呈扩散趋势。3) 永瓣藤种群特征受到了多种因素的综合影响,如群落区域小生境、永瓣藤生物学特征及人为干扰等。永瓣藤依靠无性繁殖进行种群更新的特点大大限制了其种群扩散能力,同时,严格的生境需求降低了其对环境的适应能力。因此,永瓣藤种群抵抗外界干扰的能力远低于表象。

Monimopetalum chinense, an endemic species in China, is a deciduous woody liana species with a small geographic distribution in Anhui, Jiangxi and Hubei Province. Now it is listed as one of the Chinese national grade-2 protective wild plants. In order to describe quantitatively dynamics of M. chinense populations, four typical plots in different community types were established with contiguous grid quadrate method and field data were collected in Zongli village of Anhui Province. The time-specific life table and survivorship curve of M. chinense populations were established, and its population structure and spatial distribution pattern were analyzed with the theoretical distributing model and assembling intensity index. The results were as follows. Because of different environmental conditions, the characteristic time-specific life tables and survivorship curves of 4 populations were separately developed. The survivorship curve of populations A and D fitted between Deevey Ⅰ and Deevey Ⅱ type and had a stable structure, and that of population C was Deevey II type. However, the survivorship curve of population B fitted Deevey I type and was in the early stage of declining. In general, most M. chinense individuals in Zongli village were assembled in the 1, 2 and 3 classes, and elder ones were few. It appeared that the population was a stably developmental one with sufficient recruitment. There are two regeneration modes of M. chinense in forest: sexual and asexual reproduction, but the latter was the main mode. Common methods used for quantifying the spatial patterns were employed to detect the spatial pattern of M. chinense populations. Generally speaking, the population was clump in terms of the distribution pattern of the populations, but there was variation among various developmental stages, clump for saplings, random for adult individuals. The study of distribution patterns using different sizes of block showed that the pattern scale was near 4 m2 or 16 m2. The analysis indicated that numeric characteristics of M. chinense population were decided mainly by the interaction among the biological, ecological property and environmental factors and so on. The reproductive ways of M. chinense restricted greatly its spreading ability, and its rigorous habitat requirements decreased the adaptive capacity to environment change. Therefore, resistivity of M. chinense populations to the environmental disturbance was lower than what they appeared.


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