四川都江堰亚热带针阔混交林中主要晚生型外生菌根真菌类群的空间分布

晚生型外生菌根真菌通常出现在森林演替的后期,是成熟林中的优势外生菌根真菌类群。对四川都江堰一片亚热带针阔混交林中的菌根真菌地上群落进行调查,并应用二元逻辑回归分析对晚生型外生菌根真菌的主要类群,即鹅膏菌科、牛肝菌科和红菇科,与周围(5m×5m样方)树种组成的关系进行研究。还应用次级变量分析方法对主要外生菌根真菌类群的空间格局进行了分析。结果表明,非外生菌根树种及某些外生菌根树种对特定类群菌根真菌子实体的出现有抑制作用,而不同类群外生菌根真菌在克隆生长上的差异并不是子实体空间分布的决定因素。我们认为,当研究自然林中外生菌根子实体的空间分布时,除了宿主植物的分布,也应考虑非宿主植物的分布以及菌根真菌相互作用的影响。

Spatial Pattern of the Most Common Late-stage Ectomycorrhizal Fungi in a Subtropical Forest in Dujiangyan, Southwest of China

Late-stage or later-successional ectomycorrhizal fungi, dominant ectomycorrhizal species inmature forest, are generally important symbiotic partners of dominant tree species in many forestecosystems. Spatial patterns of fungal sporocarps of three families, i.e. Amanitaceae, Boletaceae andRussulaceae, in a subtropical forest in Dujiangyan were examined using second-order analysis in the presentpaper. The woody plant compositions of the plots associated with ectomycorrhizal fungi of three familieswere also compared using binary logistic regression analysis. Results indicated that presences of non-ectomycorrhizal and some ectomycorrhizal plants might have negative effects on the occurrence ofectomycorrhizas (ECM) fungal sporocarps and the characteristics in clonal growth of fungal taxa would notbe the only determinant in the spatial pattern of ECM fungi. We suggest that besides host plants, non-ectomycorrhizal woody plants and interaction of ECM fungi should also be considered in spatial studies ofECM fungal communities in natural forests.