鹞落坪国家级自然保护区吊罐井物种分布格局与种间关联的多尺度分析

Multi-scale Analysis of Species Spatial Distribution Patterns and Associations in Diaoguanjing Plots in Yaoluoping National Nature Reserve

为了探讨群落结构形成机制,采用点格局分析方法,对鹞落坪国家级自然保护区吊罐井核心区1hm2样地内36个优势物种在0~50m尺度上的空间分布格局和种间关联性进行了研究。结果显示,36个物种的空间分布格局在小尺度上主要呈聚集分布,在较大尺度上呈随机分布的物种比例最高;对36个物种种间关联性的分析发现,无关联类型是该样地物种间相互作用的主要表现形式,并且在10m尺度上无关联种对的比例最低,正相关和负相关的种对在所有尺度上的比例均未超过20%。群落结构的次生性、生境异质性和扩散限制性是导致该样地物种分布和种间关系格局的主要原因。本研究结果有助于了解物种共存的尺度依赖性特征及其形成机制。

Analysis of species spatial distribution and associations contribute to understanding the mechanisms of community structure.In this paper,spatial point patterns were used to analyze the spatial distribution patterns and species associations of 36 dominant species at the scale of 0- 50 m in Diaoguanjing plots in the Yaoluoping National Nature Reserve.Results indicated that species were cluster distributed at the fine scale and randomly distributed at the coarse scale.No association patterns dominated at the 0- 50 m scale,but the percentage of non-correlated plant species pairs was the lowest at the scale of 10 m.No positive or negative correlated plant species pairs exceeded 20% at the 0- 50 m scale.We concluded that the secondary community,habitat heterogeneity and dispersal limitation were the main factors responsible for the patterns of species distribution and associations in the studied plots.Our results will help to improve understanding ofthe multi-scale characteristics and mechanisms of species coexistence.