PDF(Pubmed)
Abstract：
Fungi play vital regulatory roles in terrestrial ecosystems. Local community assembly mechanisms, including deterministic and stochastic processes, as well as the size of regional species pools (gamma diversity), typically influence overall soil microbial community beta diversity patterns. However, there is limited evidence supporting their direct and indirect effects on beta diversity of different soil fungal functional groups in forest ecosystems. To address this gap, we collected 1606 soil samples from a 25-ha subtropical forest plot in southern China. Our goal was to determine the direct effects and indirect effects of regional species pools on the beta diversity of soil fungi, specifically arbuscular mycorrhizal (AM), ectomycorrhizal (EcM), plant-pathogenic, and saprotrophic fungi. We quantified the effects of soil properties, mycorrhizal tree abundances, and topographical factors on soil fungal diversity. The beta diversity of plant-pathogenic fungi was predominantly influenced by the size of the species pool. In contrast, the beta diversity of EcM fungi was primarily driven indirectly through community assembly processes. Neither of them had significant effects on the beta diversity of AM and saprotrophic fungi. Our results highlight that the direct and indirect effects of species pools on the beta diversity of soil functional groups of fungi can significantly differ even within a relatively small area. They also demonstrate the independent and combined effects of various factors in regulating the diversities of soil functional groups of fungi. Consequently, it is crucial to study the fungal community not only as a whole but also by considering different functional groups within the community.
摘要：
真菌在陆地生态系统中起着至关重要的调节作用。当地社区集会机制，包括确定性和随机过程，以及区域物种库的大小(伽马多样性)，通常会影响整个土壤微生物群落β多样性模式。然而,有限的证据支持它们对森林生态系统中不同土壤真菌官能团β多样性的直接和间接影响。为了解决这个差距，我们从中国南方25公顷的亚热带森林中收集了1606个土壤样本。我们的目标是确定区域物种库对土壤真菌β多样性的直接影响和间接影响，特别是丛枝菌根(AM)，外生菌根（EcM），植物致病性，和腐生真菌.我们量化了土壤性质的影响，菌根树丰富，和地形因素对土壤真菌多样性的影响。植物病原真菌的β多样性主要受物种库大小的影响。相比之下,EcM真菌的β多样性主要是通过群落组装过程间接驱动的。它们对AM和腐生真菌的β多样性都没有显着影响。我们的结果强调，即使在相对较小的区域内，物种库对真菌土壤官能团β多样性的直接和间接影响也可能显着不同。它们还证明了各种因素在调节真菌土壤官能团多样性方面的独立和综合作用。因此,研究真菌群落不仅要作为一个整体，还要考虑群落内不同的功能群体。
