灵空山自然保护区油松-辽东栎林建群种关联性

Spatial associations of constructive species in Pinus tabulaeformis-Quercus wutaishanica forest in Lingkong Mountain Nature Reserve, Shanxi Province of China

以山西灵空山自然保护区油松(Pinus tabulaeformis)-辽东栎(Quercus wutaishanica)林4hm2样地调查数据为基础,采用O-ring点格局分析方法,对油松-辽东栎林建群种的不同空间格局关联性进行分析,结果表明:油松种群不同空间的关联性表现为0～20m小尺度上的正关联,辽东栎种群不同空间的关联性基本表现为无关联;上层辽东栎与油松各层之间及上层油松与中层辽东栎的空间关联性在0～20m的水平空间尺度上表现为负关联,>20m的水平空间尺度上表现为无关联,中层辽东栎与下层油松的空间关联性在0～10m的水平空间尺度上表现出不显著的正关联,>10m的尺度上表现出无关联,中层辽东栎与中层油松、下层辽东栎与油松各层的空间关联性则表现出无关联;油松和辽东栎种内的垂直空间关联性均表现为正关联或无关联,而二者的种间关联性在0～20m的小尺度垂直分布格局上表现出负关联。

Based on the investigation data from a 4-hm2 plot of Pinus tabulaeformis Quercus wutaishanica forest in Lingkong Mountain Nature Reserve of Shanxi Province, China, and by using O-ring point pattern analysis method, this paper analyzed the spatial pattern and relevance of constructive species in this forest. On horizontal distribution with smaller scale （0-20 m）, a positive spatial association was observed within the population of P. tabulaeformis but not Q. wutaishanica. The more detailed comparisons showed a negative relevance between P. tabula formis and Q. wutaishanica at upper layer, and between upper-layered P. tabulaeformis and in termediately-layered Q. wutaishanica. In the horizon of greater scale （〉20 m）, no horizontal relevance was observed within the populations of each species. There was no correlation between P. tabulaeformis at lower layer and Q. wutaishanica at intermediate layer in the areas with a scale greater than 10 m, although their relevance was insignificantly positive in the scale of 0-10 m. Further comparisons found no horizontal relevance between the intermediately-layered frac- tions of the two species, and between the lower-layered Q. wutaishanica and each layer of P. tabulaeformis. Vertically, both positive and insignificant spatial relevance were observed within the populations of each species. However, in the areas with smaller scale （0-20 m）, the nega tive relevance in vertical distribution pattern was significant between the two species.