华南海岸英罗港红树植物木榄种群结构的空间异质性

采用位置指数(CE)、分异指数(TC和TH)、Shannon-Wiener多样性指数(D)以及Ripley的K-方程,探讨了华南海岸英罗港树植物木榄种群的分布格局、胸转和树高分异以及冠层结构方面的空间异质性.多数种群呈现随机分布,其个体胸转和树高的分异程度较低;页少数种群呈现集群分布,其个体胸围和树高的分异程度明显.采用地理信息(GIS)对冠层和空隙斑块进行了多种水平垂直尺度的分析,冠层与空隙斑块之间的镶嵌格局因种群而异,这种可基于树冠抽影用Shannon-wiener多样性指数时行定量描述.冠层结构的窨异质性阻碍空间尺度而变化,但这种变化在一定尺度范围内保持相对的稳定.迷一尺度范围可作为木榄红树森更新或生态管理单位的参考尺度.

Spatial Heterogeneity of Population Structure of the Mangrove Bruguiera gymnorrhiza at Yingluo Bay,South-China Coast

The spatial heterogeneity, including distribution pattern, tree perimeter and height differentiation, and canopy structure heterogeneity, of Bruguiera gymnorrhiza (L.) Lamk populations at Yingluo Bay, South-China Coast was investigated using the positioning index (CE), differentiation index (TC and TH), Shannon-Wiener diversity index (D), and Ripley’s K -functions. Most populations showed random distribution and low differentiation in perimeters and heights of individuals, while a few showed clumped distribution and clear differentiation. Canopy and gap patches were analyzed at multiple horizontal and vertical scales using geographic information system (GIS). The mosaic patterns of canopy and gap patches are different among populations, and could be quantitatively described with the Shannon-Wiener diversity index based on crown projection. The spatial heterogeneity of the canopy structure changed with spatial scales, but this kind of change would remain relatively stable over a range of scales. This scale range could be regarded as the referenced scale for a regeneration or ecological management unit for the forest.