海南苏铁种群结构与森林群落郁闭度的关系
吴二焕, 李东海, 杨小波, 左永令, 李龙, 张培春, 陈琳, 田路嘉, 李晨笛

Population structure of Cycas hainanensis and its relationship with forest canopy density
Erhuan Wu, Donghai Li, Xiaobo Yang, Yongling Zuo, Long Li, Peichun Zhang, Lin Chen, Lujia Tian, Chendi Li
表4 海南省保梅岭省级自然保护区海南苏铁种群空间分布格局。样方A、B、C、D、E、F详细信息见表1
Table 4 Spatial distribution pattern of Cycas hainanensis population in the Baomeiling Provincial Nature Reserve of Changjiang County, Hainan Province. Details of quadrat A, B, C, D, E, F see Table 1.
样方 Quadrat 郁闭度Forest canopy density 方差Variance 方差均值比 Average variance ratio (DI) t
负二项参数Negative binomial parameters (k) 丛生指数Cluster index (I) 平均拥挤指数Average crowding
index (m*)
聚集指数Patchiness index (Pai) 扩散型指数Type diffusion index (I&) 格林指数Green index (GI) Cassie 指标 Cassie index(CA
A 0.64 31.12 3.58 5.48 4.62 2.58 11.28 1.30 1.27 2.38 0.22
B 0.51 192.1 16.14 32.2 1.75 15.14 27.04 2.27 2.15 19.9 0.57
C 0.47 11.38 1.78 1.65 10.29 0.78 7.18 1.12 1.30 0.44 0.10
D 0.29 134.7 26.38 11.5 5.10 15.38 26.48 1.26 1.23 12.5 0.20
E 0.59 17.43 2.53 3.25 6.01 1.53 8.43 1.22 1.20 1.06 0.17
F 0.59 311.8 11.55 22.4 3.55 10.55 37.57 1.40 1.35 31.5 0.28