防城季节性雨林两广梭罗树种群空间分布格局及种内关联分析

为探究两广梭罗树(Reevesia thyrsoidea)种群的空间分布格局及种内关联特征,本研究在防城那山子季节性雨林设置1 hm²动态监测样地,分别采用单变量函数g(r)和双变量函数K₁₂(r)分析种群的空间分布格局和不同发育阶段个体群的种内关联性。结果显示：两广梭罗树种群的小龄级个体数量较多,种群径级结构呈金字塔形,种群处于增长状态;在多尺度上,两广梭罗树种群整体以及幼树、小树和成树个体群趋于集群分布;幼树、小树和成树个体群之间空间分布呈现显著的正相关;两广梭罗树种群幼龄个体充足,具有良好的更新潜能,成年个体对幼龄个体无明显的抑制作用;通过个体聚集和种内庇护的方式,两广梭罗树种群在群落中具有较强的竞争能力,并占据着有利的生态位。综上,两广梭罗树种群目前的生存状况受密度制约因素影响较小,呈现增长的趋势。

Analysis on Spatial Distribution Pattern and Intraspecific Correlation of Reevesia thyrsoidea Population in Fangcheng Seasonal Rainforest

In order to explore the spatial distribution pattern and intraspecific association characteristics of Reevesia thyrsoidea population,a 1 hm² dynamic monitoring plot was set up in the seasonal rainforest of Nashanzi in Fangcheng.The univariate function g(r) and the bivariate function K₁₂ (r) were used to analyze the spatial distribution pattern of the population and the intraspecific correlation of individual groups at different developmental stages.The results show that there are a large number of small-age individuals in the R.thyrsoidea population,the population diameter structure is pyramid-shaped,and the population is in a growing state.On multi-scale,the whole population,saplings,small trees and adult trees of R.thyrsoidea tend to cluster distribution.There is a significant positive correlation between the spatial distribution of saplings,small trees and adult trees.The young individuals of R.thyrsoidea population are abundant and have a good regeneration potential.The adult individuals have no significant inhibitory effect on the young individuals.Through individual aggregation and intraspecies protection,R.thyrsoidea population has a strong competitiveness in the community and occupies a favorable ecological niche.In summary,the current survival status of R.thyrsoidea population is less affected by density constraints and shows an increasing trend.