河北小五台山青杨种群中雌雄群体的空间分布及其成因

蒙振思,向卫,苏国岿,李大东,董廷发,彭进友,李晓东,龚小平,梁宁,胥晓

Spatial distribution of male and female Populus cathayana populations and its drivers in Xiaowutai Mountains, Hebei, China

MENG Zhen-Si,XIANG Wei,SU Guo-Kui,LI Da-Dong,DONG Ting-Fa,PENG Jin-You,LI Xiao-Dong,GONG Xiao-Ping,LIANG Ning,XU Xiao

表2 小五台山不同海拔梯度上青杨雌雄群体的个体数、密度、平均胸径和性比(平均值±标准误差)

Table 2 The number, density, average diameter at breast height (DBH) and sex ratio of female and male Populus cathayana trees at different altitudes in Xiaowutai Mountains (mean ± SE)

海拔 Altitude	雄株 Male			雌株 Female			性比 Sex ratio
海拔 Altitude	数量 Number	密度 Density (ind.·hm^-2)	平均胸径 DBH (cm)	数量 Number	密度 Density (ind.·hm^-2)	平均胸径 DBH (cm)	性比 Sex ratio
低海拔 Low altitude (1300-1400 m)	88	18.87	38.90 ± 1.23^a	130	27.88	38.54 ± 1.16^a	0.68
中低海拔 Middle-low altitude (1400-1500 m)	818	130.33	32.89 ± 0.42^c	622	99.10	32.04 ± 0.43^c	1.32
中海拔 Middle altitude (1500-1600 m)	1 462	144.83	34.17 ± 0.31^bc	1 481	146.71	32.57 ± 0.29^c	0.99
中高海拔 Middle-high altitude (1600-1700 m)	685	130.20	36.16 ± 0.46^b	660	125.44	35.28 ± 0.42^b	1.04
高海拔 High altitude (1700-1800 m)	121	61.71	38.91 ± 1.30^a	112	57.12	38.44 ± 1.08^a	1.08