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3 小五台山与河岸不同距离范围内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 3 The number, density, average diameter at breast height (DBH) and sex ratio of female and male Populus cathayana trees at different distances from the Jinhegou River in Xiaowutai Mountains (mean ± SE)

与河岸距离 Distance from river	雄株 Male			雌株 Female			性比 Sex ratio
与河岸距离 Distance from river	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
0-10 m	1 546	197.28	35.93 ± 0.29^a	1 339	170.86	34.51 ± 0.29^ab	1.15
10-30 m	882	102.85	34.43 ± 0.43^ab	982	114.51	33.90 ± 0.37^bc	0.90
30-60 m	544	96.44	32.48 ± 0.54^cd	480	85.10	31.81 ± 0.55^de	1.13
> 60 m	202	75.92	30.65 ± 0.76^ef	204	76.67	29.86 ± 0.83^f	0.99