ArticleFrontiers in microbiology2026
Relationship between soil microbial necromass carbon and community assembly in the forest-grassland ecotone of northern China.
Article in Frontiers in microbiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Introduction: Microbial necromass carbon (MNC) is crucial for the turnover of soil carbon within land ecosystems. Investigating the relationship between microbial residual carbon and microbial community assembly across contrasting land-use patterns provides critical insight into whether land-use modification can regulate microbial community structure to enhance soil carbon sequestration. Methods: Therefore, this study examined soil MNC and the mechanism of microbial community assembly across the 0-50 cm soil profile of farmlands, grasslands, secondary forests, and planted forests within the forest-grassland ecotone in Northern China. Results: The results demonstrated significantly higher MNC and accumulation coefficient of grassland in each soil layer compared to the other three land-use types (p < 0.05), with farmland and grassland demonstrating the highest contributions of MNC to soil organic carbon (SOC), accounting for 50.3% and 46.7%, respectively. Increasing soil depth resulted in decreased MNC content in the four land-use types. Fungal necromass carbon (FNC) served as the predominant component within MNC and represented the principal contributor to SOC. Soil bacterial community was regulated by the combined influence of stochastic and deterministic processes across land-use types, whereas fungal community was predominantly driven by stochastic processes. Moreover, a significant association was observed between fungal necromass carbon and the bacterial community assembly process. Conclusion: The results provide a reference for optimizing land-use strategies within the forest-grassland ecotone of northern China.
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