Precipitation increase promotes soil organic carbon formation and stability via the mycorrhizal fungal pathway
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Changes in soil organic carbon (SOC) stocks play a pivotal role in regulating future climate change. Arbuscular mycorrhizal fungi (AMF) are critical regulators of SOC dynamics, yet the impacts of climate-induced changes, such as precipitation increase (Pi), on AMF- and root-mediated SOC formation and stability remain largely unexplored. Combining global meta-analysis with a long-term field experiment, our study demonstrates that Pi enhances SOC formation and stability primarily through AMF, rather than plant roots, by recruiting bacterial K-strategists and promoting necromass production. These findings provide direct evidence that AMF-driven microbial processes are essential for SOC stability under changing precipitation regimes, uncovering an often-overlooked mechanism of SOC sequestration in grassland ecosystems and enhancing our understanding of climate change impacts on C cycling.
土壤有机碳（soil organic carbon, SOC）储量的变化对未来气候变化的调控具有关键作用。丛枝菌根真菌（arbuscular mycorrhizal fungi, AMF）是调控土壤有机碳动态的核心因子，但气候诱导的环境变化（如降水增加（precipitation increase, Pi））对AMF与根系介导的土壤有机碳形成及稳定性的影响，目前仍未得到充分探明。本研究结合全球荟萃分析与长期野外试验，证实降水增加主要通过AMF（而非植物根系）促进土壤有机碳的形成与稳定性，其作用路径为招募细菌K-策略微生物并促进其残体生成。上述发现为降水格局改变背景下AMF驱动的微生物过程对土壤有机碳稳定性的必要性提供了直接证据，揭示了草原生态系统中常被忽略的土壤有机碳固存机制，并深化了我们对气候变化影响碳循环的认知。
