Spatial distributions of tree species in a subtropical forest of China
Spatial distributions of tree species in a subtropical forest of China
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DOI：
10.1111/j.1600-0706.2009.16753.x
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发表时间：
2009-04-01
期刊：
影响因子：
3.4
通讯作者：
He, Fangliang
中科院分区：
文献类型：
--
作者：
Li, Lin;Huang, Zhongliang;He, Fangliang
物种个体的空间分布是一种重要的格局，受多种机制控制。在这项研究中，我们分析了中国物种丰富的亚热带森林中大规模（20公顷）树干制图样地中树种的空间分布。O型环统计量用于测量丰度> 10的物种的空间格局。Omega（0-10），一棵树10 m内的平均同种密度，被用来作为一个物种的聚集强度的措施。结果表明：（1）在样地中，聚集分布是优势分布型。随着空间尺度的增大，聚集种的比例逐渐降低。(2)显著聚集种的百分比从丰富到中等和稀有种逐渐降低。稀有种比常见种聚集性更强。聚集是较弱的直径较大的类。(3)种子性状决定了树木的空间格局。种子传播模式可以影响物种的空间格局，与物种分散的动物或风，分别比分散的集群。综合以上结果，我们认为种子扩散限制、自疏作用和生境异质性是影响森林空间格局和物种共存的主要因素。
The spatial dispersion of individuals in a species is an important pattern that is controlled by many mechanisms. In this study we analyzed spatial distributions of tree species in a large-scale (20 ha) stem-mapping plot in a species-rich subtropical forest of China. O-ring statistic was used to measure spatial patterns of species with abundance > 10. Omega(0-10), the mean conspecific density within 10 m of a tree, was used as a measure of the intensity of aggregation of a species. Our results showed: (1) aggregated distribution was the dominant pattern in the plot. The percentage of aggregated species decreased with increased spatial scale. (2) The percentages of significantly aggregated species decreased from abundant to intermediate and to rare species. Rare species was more strongly aggregated than common species. Aggregation was weaker in larger diameter classes. (3) Seed traits determined the spatial patterns of trees. Seed dispersal mode can influence spatial patterns of species, with species dispersed by both modes being less clumped than species dispersed by animal or wind, respectively. Considering these results, we concluded that seed dispersal limitation, self-thinning and habitat heterogeneity primarily contributed to spatial patterns and species coexistence in the forest.