Sun Baoyu, Sun Ruifeng, Xu Jianjun, Gao Wenjing, Chu Xiaojing, Yuan Huilan, Wan Fangxiu, Yan Liming, Han Guangxuan, Xia Jianyang, Nie Ming
State Key Laboratory of Wetland Conservation and Restoration, National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, and Institute of Eco-Chongming, School of Life Sciences, Fudan University, Shanghai, China.
Research Center for Global Change and Ecological Forecasting, School of Ecological and Environmental Sciences, Institute of Eco-Chongming, East China Normal University, Shanghai, China.
Ecol Lett. 2025 May;28(5):e70129. doi: 10.1111/ele.70129.
Wetlands are large reservoirs of soil organic carbon (SOC), storing one-third of global SOC within 6% of the land surface. However, the feedback direction and magnitude of wetland SOC storage to climate warming remain unclear. Here we present results from an 8-year (2014-2022) wetland warming experiment in the Yellow River Delta, revealing that wetland SOC storage responds to warming in a phase-dependent manner. We found that warming initially reduced both carbon input and output but did not change SOC storage. However, SOC storage abruptly decreased by 21.4% in 2020, which persisted over the following 2 years. This occurred mainly due to shifts in the biomass of dominant plant species (P. australis) under warming, reducing carbon input, increasing microbial carbon degradation, and resulting in microbial necromass carbon loss. These results highlight the critical role of dominant plant species in driving the wetland soil carbon cycle and its feedback to climate change.
湿地是土壤有机碳（SOC）的大型储存库，在仅占陆地面积6%的区域内储存了全球三分之一的土壤有机碳。然而，湿地土壤有机碳储存对气候变暖的反馈方向和强度仍不明确。在此，我们展示了黄河三角洲一项为期8年（2014 - 2022年）的湿地升温实验结果，揭示了湿地土壤有机碳储存对升温的响应具有阶段依赖性。我们发现，升温最初降低了碳输入和输出，但并未改变土壤有机碳储存。然而，2020年土壤有机碳储存量突然下降了21.4%，并在随后的两年持续下降。这主要是由于升温导致优势植物物种（芦苇）生物量发生变化，减少了碳输入，增加了微生物碳降解，并导致微生物坏死碳损失。这些结果突出了优势植物物种在驱动湿地土壤碳循环及其对气候变化反馈方面所起的关键作用。
