庐山25 hm^(2)森林样地乔木层优势种空间分布格局及关联性

Spatial distribution pattern and correlation of dominant species in the arbor layer at a 25 hm^(2) forest plot in Lushan Mountain,China

为探究亚热带亚高山地区庐山地带性树种的空间分布格局,参照CTFS技术规范,2021年在庐山仰天坪地区建立了25 hm^(2)森林样地,按叶片形状、是否落叶等植物生活型,将样地乔木树种类分为常绿针叶树种、落叶阔叶树种和常绿阔叶树种,使用空间点格局法分析了不同生活型中优势种的空间分布格局。结果表明:台湾松、四照花、化香树、锥栗、枹栎、灯台树、格药柃、黄丹木姜子、微毛柃等为主要优势种,其中台湾松为样地乔木层建群种。优势种种群空间点格局表现为在一定尺度内聚集分布,随着尺度的增加,逐渐转变为随机分布。常绿针叶树种与落叶阔叶树种、常绿阔叶树种之间呈小尺度内无关联、大尺度下负相关的特点;落叶阔叶树种与常绿阔叶树种之间的负相关关系较为明显;各落叶阔叶树种之间在小尺度内呈正相关或无关联,大尺度下呈负相关;常绿阔叶树种间在小尺度内呈正相关,中间尺度内无关联,大尺度下呈负相关。

To explore the spatial pattern of zonal tree species in the subtropical subalpine mountain area on Lushan Mountain,a 25 hm^(2) forest plot was established in Yangtianping area of Lushan Mountain following the technical specification of CTFS in 2021.We classified these species into evergreen conifer species,deciduous broad-leaved species and evergreen broad-leaved species based on their leaf shape and deciduous or not to analyze the spatial pattern of dominant species of different types by spatial point pattern method.The results showed that Pinus taiwanensis,Cornus kousa subsp.chinensis,Platycarya strobilacea,Castanea henryi,Quercus serrata,Cornus controversa,Eurya muricata,Litsea elongata,and Eurya hebeclados were dominant species.Among these species,P.taiwanensis was the constructive one.The spatial pattern of dominant species was clustered at a certain scale,and gradually became to randomly distribution with the increases of scales.Evergreen conifer species was independent with deciduous broad-leaved species and evergreen broad-leaved species at small scales,but was negatively correlated with them at large scales.Deciduous broad-leaved species and evergreen broad-leaved species were obviously negatively correlated with each other.Deciduous broad-leaved species were positively correlated or independent with each other at small scales,but were negatively correlated with each other at large scales.Evergreen broad-leaved species were positively correlated at small scales,independent at medium scales,and negatively correlated with each other at large scales.