数字农科院2.0

Trade-offs between stock and stability: Reversing land-use for soil carbon sequestration in a warming world

文献类型： 外文期刊

作者： Feng, Wenhao;Lu, Yingxin;Liu, Chunyan;Abdalla, Khatab;Zhang, Wentao;Zamanian, Kazem;Shi, Lingling;Yang, Haishui;Li, Feng-Min;Zhou, Jie;Mganga, Kevin Z.

作者机构：

关键词： SOM mineralization;Temperature sensitivity;Land use change;Priming effect;Microbial life strategy;Carbon sequestration

期刊名称： PLANT AND SOIL

ISSN： 0032-079X

年卷期： 2026 年

页码：

收录情况： SCIE（2025版）

摘要： AimsLand-use legacies profoundly influence soil carbon (C) cycling, yet their quantitative effects on priming effects (PE) and temperature sensitivity (Q10) remain poorly understood.MethodsUsing a 90-day incubation experiment across contrasting temperatures (5 degrees C and 15 degrees C), we examined century-scale land-use transitions-grassland, cropland, and bare fallow-on soil organic matter (SOM) dynamics. By integrating long-term positioning experiments with microbial ecological strategy analysis, this study revealed the pivotal role of microbial functional communities in regulating C cycle responses.ResultsGrassland soils sustained the highest cumulative PE (668 mu g C g(-)1 soil) and Q10-SOM (1.8), exceeding cropland and bare fallow by 50-220% and 21-23%, respectively. The enhanced PE in grasslands was attributed to greater microbial metabolic efficiency-supported by increased microbial biomass C and elevated hydrolases-and dominance by resource-acquisitive Actinobacteriota (A-strategists) forming key consortia with Proteobacteria for oxidative decomposition. Path analysis attributed 74% of SOM variance to nutrient availability and microbial traits. Consequently, while grasslands store soil C reserves (343 Pg C) globally, they demonstrate high vulnerability to warming, with meta-analysis indicating a PE increase of 1.05 mu g C g(-)1 soil day(-)1 per 0.1 degrees C warming. In contrast, cropland and fallow systems, displayed suppressed microbial functionality, prolonged metabolic lag phases, and attenuated PE (-57%) under warming. Thus, despite approximately 20% lower soil organic C stocks in croplands compared to grasslands, their residual C exhibits greater thermal stability.ConclusionsThese findings highlight a critical trade-off between SOC storage and stability, with important implications for predicting C-climate feedbacks in agricultural ecosystems.Graphical AbstractGraphical summary of key findings illustrating the linkages between soil biochemical properties, biological traits, microbial traits (diversity, life-history strategies), soil priming effect (PE), and temperature sensitivity (Q10-SOM) under different land use types.

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