Faculty of Life Science and Technology, Central South University of Forestry and Technology, Changsha, 410004, Hunan, China.
Huitong National Station for Scientific Observation and Research of Chinese Fir Plantation Ecosystems in Hunan Province, Huitong, Huaihua, 438107, Hunan, China.
Appl Microbiol Biotechnol. 2019 Jul;103(13):5421-5433. doi: 10.1007/s00253-019-09867-z. Epub 2019 May 9.
Subtropical broadleaved forests play a crucial role in supporting terrestrial ecosystem functions, but little is known about their belowground soil fungal communities despite that they have central functions in C, N, and P cycles. This study investigated the structures and identified the drivers of soil fungal communities in subtropical deciduous and evergreen broadleaved forests, using high-throughput sequencing and FUNGuild for fungal identification and assignment to the trophic guild. Fungal richness was much higher in the deciduous than in the evergreen forest. Both forests were dominated by Ascomycota and Basidiomycota phyla, but saprophytic fungi were more abundant in the deciduous forest and ectomycorrhizal fungi predominated in the evergreen forest. Fungal communities had strong links to plant and soil properties. Specifically, plant diversity and litter biomass were the main aboveground drivers of fungal diversity and composition in the deciduous forest, while host effects were prominent in the evergreen forest. The belowground factors, i.e., soil pH, water content, and nutrients especially available P, were identified as the primary drivers of soil fungal communities in the broadleaved forests. Co-occurrence network analysis revealed assembly of fungal composition in broadleaved forest soils was non-random. The smaller modularity of the network in the deciduous forest reflects lower resistance to environment changes. Concluding, these results showed that plant community attributes, soil properties, and potential interactions among fungal functional guilds operate jointly on the divergence of soil fungal community assembly in the two broadleaved forest types.
亚热带阔叶林在支持陆地生态系统功能方面起着至关重要的作用，但尽管它们在 C、N 和 P 循环中具有核心功能，人们对其地下土壤真菌群落却知之甚少。本研究使用高通量测序和 FUNGuild 对亚热带落叶林和常绿阔叶林的土壤真菌群落结构进行了调查，并对真菌进行了鉴定和功能分类。落叶林的真菌丰富度明显高于常绿林。两种森林都以子囊菌门和担子菌门为主，但落叶林中的腐生真菌更为丰富，而外生菌根真菌则在常绿林中占优势。真菌群落与植物和土壤特性密切相关。具体而言，植物多样性和凋落物生物量是落叶林真菌多样性和组成的主要地上驱动因素，而宿主效应在常绿林中更为明显。地下因素，即土壤 pH 值、含水量和养分，特别是有效磷，被确定为阔叶林中土壤真菌群落的主要驱动因素。共现网络分析表明，阔叶林土壤中真菌组成的组装是非随机的。落叶林中网络的较小模块性反映了对环境变化的较低抵抗力。综上所述，这些结果表明，植物群落特征、土壤特性以及真菌功能类群之间的潜在相互作用共同作用于两种阔叶林土壤真菌群落组装的差异。
