华北地区主要灌丛群落物种组成及系统发育结构特征

柴永福,许金石,刘鸿雁,刘全儒,郑成洋,康慕谊,梁存柱,王仁卿,高贤明,张峰,福臣,刘晓,岳明

Species composition and phylogenetic structure of major shrublands in North China

CHAI Yong-Fu,XU Jin-Shi,LIU Hong-Yan,LIU Quan-Ru,ZHENG Cheng-Yang,KANG Mu-Yi,LIANG Cun-Zhu,WANG Ren-Qing,GAO Xian-Ming,ZHANG Feng,SHI Fu-Chen,LIU Xiao,YUE Ming

表4 环境因子对华北地区灌丛群落灌木层和草本层物种净谱系亲缘关系指数(NRI)的影响

Table 4 Effects of environmental factors on net relatedness index (NRI) of shrub layer and herb layer species of shrubland in North China

结构层 Structural layer R2 p 显著环境因子 Significant environmental factors 标准化回归系数 Beta regression coefficient t p 灌木层 Shrub layer 0.18 <0.05 MTWEQ 6.81 7.91 <0.01 PWEQ 5.08 5.16 <0.01 MDTR 2.39 2.19 0.03 MTCQ 1.74 2.73 0.01 Alt 0.22 2.44 0.01 ISO -0.89 -2.71 0.01 PWAQ -5.45 -4.64 <0.01 MTWM -9.54 -8.32 <0.01 草本层 Herb layer 0.05 <0.05 TS 0.12 2.46 0.01 MTWEQ 0.12 2.56 0.01 PDM 0.12 2.84 <0.01 PS 0.08 2.39 0.02