Abstract:【Objective】Soil microbial biomass carbon (SMBC) is an important indicator of microbial activity, and the type of mycorrhizal has a potential impact on SMBC content. The objective is to explore the impact of different mycorrhizal types on soil microbial biomass carbon and clarity their functions under global climate changes. 【Method】Based on the SMBC database established by predecessors, the SMBC content and its distribution of plants of different mycorrhizal types were explored by dividing different soil layers (0-100 cm, 0-40 cm, 40-100 cm) and determining the mycorrhizal types of plants in the database. 【Result】The results showed significant differences in SMBC between different layers of Arbuscular mycorrhiza (AM) and Ectomycorrhiza (ECM) plants, among which ECM plant soil SMBC was significantly higher than that of AM plant. There were also differences in the response of SMBC to soil parameters (soil depth, soil total nitrogen) and climate parameters (average annual temperature, average annual rainfall). At soil depth of 0-40 cm, the effects of factors (48.9%, 47.99%) on SMBC were significantly higher than that of climate factors under both AM and ECM plants (8.45%, 2.25%). Also, at soil depth of 40-100 cm, the SMBC of the ECM plant was more affected by climate factors (53.94%) than soil factors (25.32%), while the AM plant was affected differently, with the soil factor (45.17%) showing a more significant effect than climate factors (25.32%). 【Conclusion】Under the influence of different types of mycorrhiza, SMBC was significantly positively correlated with soil organic carbon and total nitrogen (P<0.01), among which ECM was more affected by soil organic carbon and total nitrogen. The analysis of variance decomposition found that with the increase in soil depth, AM plant SMBC in deep soil was mainly affected by soil factors, while ECM plant SMBC was mainly affected by climate factors. In summary, the SMBC content of the ECM plant was significantly higher than that of the AM plant, and the response to organic carbon and soil total nitrogen was also higher than that of the AM plant.
