Purahong Witoon, Ji Li, Wu Yu-Ting
Department of Soil Ecology, UFZ-Helmholtz Centre for Environmental Research, Theodor-Lieser-Str. 4, 06120, Halle (Saale), Germany.
School of Forestry, Central South University of Forestry and Technology, Changsha, 410004, China.
Microb Ecol. 2024 May 3;87(1):66. doi: 10.1007/s00248-024-02372-5.
Despite the importance of wood-inhabiting fungi on nutrient cycling and ecosystem functions, their ecology, especially related to their community assembly, is still highly unexplored. In this study, we analyzed the wood-inhabiting fungal richness, community composition, and phylogenetics using PacBio sequencing. Opposite to what has been expected that deterministic processes especially environmental filtering through wood-physicochemical properties controls the community assembly of wood-inhabiting fungal communities, here we showed that both deterministic and stochastic processes can highly contribute to the community assembly processes of wood-inhabiting fungi in this tropical forest. We demonstrated that the dynamics of stochastic and deterministic processes varied with wood decomposition stages. The initial stage was mainly governed by a deterministic process (homogenous selection), whereas the early and later decomposition stages were governed by the stochastic processes (ecological drift). Deterministic processes were highly contributed by wood physicochemical properties (especially macronutrients and hemicellulose) rather than soil physicochemical factors. We elucidated that fine-scale fungal-fungal interactions, especially the network topology, modularity, and keystone taxa of wood-inhabiting fungal communities, strongly differed in an initial and decomposing deadwood. This current study contributes to a better understanding of the ecological processes of wood-inhabiting fungi in tropical regions where the knowledge of wood-inhabiting fungi is highly limited.
尽管木生真菌在养分循环和生态系统功能方面具有重要性，但其生态学，尤其是与其群落组装相关的生态学，仍未得到充分探索。在本研究中，我们使用PacBio测序分析了木生真菌的丰富度、群落组成和系统发育。与预期相反，即确定性过程尤其是通过木材物理化学性质进行的环境过滤控制着木生真菌群落的组装，我们在此表明，确定性和随机过程都对这片热带森林中木生真菌的群落组装过程有很大贡献。我们证明，随机和确定性过程的动态随木材分解阶段而变化。初始阶段主要由确定性过程（同质选择）主导，而早期和后期分解阶段则由随机过程（生态漂变）主导。确定性过程主要由木材物理化学性质（尤其是大量营养素和半纤维素）而非土壤物理化学因素促成。我们阐明，木生真菌群落的精细尺度真菌 - 真菌相互作用，尤其是网络拓扑结构、模块性和关键类群，在初始和正在分解的枯木中存在很大差异。本研究有助于更好地理解热带地区木生真菌的生态过程，而目前该地区对木生真菌的了解非常有限。
