海南岛甘什岭热带低地雨林棕榈藤空间点格局分析

以海南岛甘什岭热带低地雨林白藤(Calamus tetradactylus)、大白藤(C.faberii)、华南省藤(C.rhabdocladus)、黄藤(Daemonorops margaritae)和小钩叶藤(Plectocomia microstachys)5种棕榈藤种群为研究对象,采用点格局分析方法对棕榈藤种内和种间空间分布格局及相互关系进行分析。结果表明:(1)海南岛甘什岭热带低地雨林棕榈藤种群的空间格局与空间尺度有着密切的关系,在小尺度上,5种棕榈藤种群都更倾向于聚集分布,随着尺度的增长,各棕榈藤种群主要趋向于随机分布,形成不同的空间分布格局。(2)各藤种间的空间关联情况在整体尺度上表现出明显负关联的是白藤和黄藤、白藤和大白藤,这可能是因为它们对生存空间及养分的需求相同或相似,存在明显的竞争关系。(3)华南省藤和大白藤在整体尺度上表现出明显正关联,这可能是由于它们在生长过程中相互庇护,用于抵御动物捕食和热带雨林内多变的外部环境。(4)黄藤和小钩叶藤以及白藤和小钩叶藤呈现出明显不相关,这说明它们对环境和生存空间的依赖没有冲突性,能做到和平共存。

Spatial distribution characteristics of rattan in tropical lowland rainforest in Ganshiling, Hainan Island

In this study we explore the spatial distribution and correlation between 5 rattan species (Calamus tetradactylus, Calamus faberii, Calamus rhabdocladus, Daemonorops margaritae and Plectocomia microstachys) in Ganshiling, Hainan Island. Results show that:(1) Spatial pattern and spatial scale of rattan populations are closely related. On a small scale, all the 5 rattan populations tend to exhibit aggregated distribution. However, at a larger spatial scale, rattan populations tend to show random distribution, and form different spatial distribution patterns. (2) C. tetradactylus showed an obvious negative correlation in spatial distribution with both D. margaritae and C. faberii. This may be because they have the same or similar needs for living space and nutrients, and there is a clear competitive relationship between them. (3) There is an strong positive correlation between C. rhabdocladus and C. faberii overall. This may be because of their shared trait of shelter during the growth process, which is used to resist animal predation and the changeable external environment in the tropical rainforest. (4) There was no significant correlation between D. margaritae and P. microstachys, nor between C. tetradactylus and P. microstachys. This shows that their dependence on the environment and living space does not conflict, and these species can coexist peacefully.