Interspecific Associations Related Research Of Predominant Community In The Forest Of Pinus Tabulaeformis-Quercus Wutaishanica In Lingkong Mountain Nature Reserve

From July to September2011, we set1fixed plot in Lingkong Mountain Nature Reserve of Shanxi Province. Based on the data obtained, first of all, we performed the floristic geographical analysis for species investigated, then the intrerspecific relationships were examined among the woody plants in the communities dominated by oak(Quercus wutaishanica) and pine(Pinus tabuliformis) in Lingkong Mountain of Shanxi province using the O-ring statistics,2×2contingency test, Jaccard similarity coefficient, Pearson correlation analysis and Spearman rank correlation analysis. We found that fixed sample community of seed plants at the Lingkong mountain nature reserve is mainly characterized by temperate, and at the same time tropical composition. According to the ecological and life distribution statistics, the local environment of this community is characterized by temperate and mesophytic climate features. The spatial pattern and relevance were examined in the forest with the constructive species of Pinus tabulaeformis-Quercus wutaishanica using the O-ring statistics for point pattern. In the analysis on horizontal distribution with smaller elevation difference (0-20m), the positive spatial association was observed within the population of P. tabulaeformis but not Q. wutaishanica. The more detailed comparisons showed negative relevance between P. tabulaeformis and Q. wutaishanica at upper layer, and between upper P. tabulaeformis and intermediately-layered Q. wutaishanica. In the horizontal scale of greater elevation difference (>20m), the data suggested no horizontal relevance within the population of each species. It was noted that no correlation was observed between P. tabulaeformis at low layer and Q. wutaishanica at intermediate layer in areas with an elevation difference greater than10m, although their relevance was seemingly significant in the scale of0-10m. The further comparisons found no horizontal relevance between the intermediately-layered fractions of both species, and between the low-layered Q. wutaishanica and each layer of P. tabulaeformis. Vertically, both positive and insignificant spatial relevance were observed within the population of each species. However, in the areas with smaller elevation difference (0-20m) the negative relevance in vertical distribution pattern was significant between the two species. The intrerspecific relationships were examined among the woody plants in the communities dominated by oak (Quercus wutaishanica) and pine (Pinus tabuliformis) in Lingkong Mountain of Shanxi province using the2×2contingency test, Jaccard similarity coefficient, Pearson correlation analysis and Spearman rank correlation analysis. The consistent results were observed for Chi-square test, Pearson correlation analysis and Spearman rank correlation analysis. The Spearman rank correlation analysis renders the best results for it contained the information that may be missing in binary coding process. A total of261out of1,053species pairs (25.22%) showed significant correlations. More positive correlations (150pairs) were observed than negative correlations (111pairs). No correlations were found among the rest744species pairs (74.78%). The oak-pine community demonstrated complicated interspecific relationship and stable structure, suggesting the mature state in succession process.