长白山哈泥泥炭地两种生境苔藓与维管植物种间联结

Interspecific relationships of bryophytes and vascular plants in two habitats of Hani Peatland in Changbai Mountain

采用2×2列联表,通过方差分析、χ2检验、Spearman秩相关和Jaccard指数对哈泥泥炭地20种优势苔藓和维管植物种间联结进行定量分析。研究结果表明,1)在开阔地,中位泥炭藓、锈色泥炭藓和桧叶金发藓3种苔藓与小叶杜鹃、鹿药、狭叶杜香的种间联结具有一致性,林缘中尖叶泥炭藓和喙叶泥炭藓与维管植物主要呈负关联;2)林缘生境物种总体呈显著正关联,开阔地中呈不显著正关联;3)2种生境下种间关联对比发现,郁闭度是影响泥炭地植被分布的重要环境因子,在同种生境下重要值大的物种之间通常出现正联系,在2种生境重要值差异大的物种之间一般表现为负联系。

A series of techniques including the analysis of variance, X^2-test, Spearman rank correlation and Jaccard Index based on a 2 × 2 contingency table were used to determine the interspecific association of the 20 dominant bryophytes and vascular plants in the Hani Peatland of Changbai Mountain. Our results indicate that in open areas the interspecific associations are similar between Sphagnum magellanicum, S. fuscum,Polytrichum j uniperinum and three vascular plants including Rhododendron parvifolium, Smilacina japonica, Ledum palustre var. ngustum. In contrast, at the forest edge the interspecific associations between S. capilifolium,S. fallax and vascular plants are mainly negative. The relationships between bryophytes and vascular plants at the forest edge are significantly positive, but are not significantly positive in open areas. Through a comparison of interspecific associations in the two habitats, we found that canopy density was an important environmental factor that influenced vegetation distribution patterns in Hani Peatland. Furthermore, in one habitat the species pairs with larger plant important values appear to have a positive association and the species-pairs which have significantly different plant important values in the two habitats appear to have a negative association.