宝天曼落叶阔叶林样地栓皮栎种群空间格局

种群空间格局分析有利于更好地理解格局形成的潜在生态过程.本研究在温带-亚热带过渡区的宝天曼自然保护区内选择两个1 ha固定监测样地,以栓皮栎(Quercus variabilis)为研究对象,采用单变量和双变量g(r)函数分析了两个典型样地中栓皮栎种群空间分布格局、4个不同生长阶段的空间分布格局和空间关联性,以及栓皮栎活立木与残干间的空间关联性.结果表明:(1)栓皮栎种群分布格局以聚集为主,样地Ⅰ的聚集性更强,而样地Ⅱ则表现出较大的随机性;(2)在两个样地中,早期阶段的个体均表现为聚集分布格局,而后期阶段的个体则表现为随机分布格局;(3)样地Ⅰ中栓皮栎种群不同生长阶段均表现为空间正相关,样地Ⅱ中栓皮栎种群的早期阶段与其后的两个阶段间均表现为空间负相关;(4)样地Ⅰ中栓皮栎活立木与残干之间为空间正相互作用,样地Ⅱ中栓皮栎活立木与残干之间无空间关联性.宝天曼自然保护区栓皮栎种群空间分布格局可能受环境异质性的作用,并对自身的天然更新产生影响.

Patterns of spatial distribution of Quercus variabilis in deciduous broadleaf forests in Baotianman Natu re Reserve

Point pattern analysis of species in a community is important in gaining a better understanding of the underlying ecological processes controlling the observed structure. In this paper, univariate and bivariate spatial point pattern analysis based on the paircorrelation function were used to evaluate the spatial patterns of Quercus variabilis. We compared the spatial patterns and associations of Q. variabilis at four different growth stages, and the relationships between standing trees and snags of Q. varia...