부산대학교 도서관

Aims: Mycorrhizal fungi and microbial community play crucial roles in soil carbon (C) cycling within forest ecosystems. The various types of mycorrhizal fungi have distinct effects on the decomposition of soil organic C, primarily through their interactions with microbial members. However, there is currently a lack of understanding regarding the linkages between mycorrhizal types and microbial properties such as microbial keystone taxa and functions.Methods: In this study, we investigated the impact of converting ECM-dominated forests to AM-dominated forests on bacterial and fungal community composition, keystone taxa and potential functions by high -throughput sequencing.Results: The ECM fungal biomass in broadleaved forest soils showed a decrease of 45.07% compared to Masson pine forest soils. In contrast, the AM fungal biomass increased significantly by 25.57%. Our results demonstrated that the conversion from ECM- to AM-dominated forests enhanced soil organic carbon (SOC), total nitrogen (TN) and fungal diversity. There was no significant change in the microbial composition at the phylum level. Moreover, the conversion significantly altered the properties of microbial co-occurrence networks and the potential function of bacteria and fungi. Correlation analysis revealed close relationships between the relative abundance of microbial keystone taxa and microbial carbon degradation genes, as well as the biomass of mycorrhizal fungi.Conclusions: Our study suggested that the conversion of ECM- to AM-dominated forests altered microbial interaction, keystone taxa and function, which were significantly associated with changes in mycorrhizal fungal biomass and drove the increase in SOC content.