Lee Jaehyun, Yang Yerang, Kang Hojeong, Noyce Genevieve L, Megonigal J Patrick
Climate and Environmental Research Institute, Korea Institute of Science and Technology, Seoul, Republic of Korea.
Smithsonian Environmental Research Center, Edgewater, MD, USA.
Sci Adv. 2025 Apr 25;11(17):eads6093. doi: 10.1126/sciadv.ads6093. Epub 2025 Apr 23.
Anaerobic methane oxidation (AMO) is a key microbial pathway that mitigates methane emissions in coastal wetlands, but the response of AMO to changing global climate remains poorly understood. Here, we assessed the response of AMO to climate change in a brackish coastal wetland using a 5-year field manipulation of warming and elevated carbon dioxide (CO). Sulfate (SO)-dependent AMO (S-DAMO) was the predominant AMO process at our study site due to tidal inputs of SO. However, SO dynamics responded differently to the treatments; warming reduced SO concentration by enhancing SO reduction, while CO increased SO concentration by enhancing SO regeneration. S-DAMO rates mirrored these trends, with warming decreasing S-DAMO rates and CO stimulating them. These findings underscore the potential of climate change to alter soil AMO activities through changing SO dynamics, highlighting the need to incorporate these processes in predictive models for more accurate representations of coastal wetland methane dynamics.
厌氧甲烷氧化（AMO）是减轻沿海湿地甲烷排放的关键微生物途径，但AMO对全球气候变化的响应仍知之甚少。在此，我们通过对变暖及二氧化碳（CO₂）浓度升高进行为期5年的田间操控，评估了咸淡水沿海湿地中AMO对气候变化的响应。由于潮汐带来硫酸根（SO₄²⁻），依赖硫酸根的AMO（S-DAMO）是我们研究地点的主要AMO过程。然而，硫酸根动态对这些处理的响应不同；变暖通过增强硫酸根还原降低了硫酸根浓度，而二氧化碳通过增强硫酸根再生增加了硫酸根浓度。S-DAMO速率反映了这些趋势，变暖降低了S-DAMO速率，而二氧化碳则刺激了S-DAMO速率。这些发现强调了气候变化通过改变硫酸根动态来改变土壤AMO活动的潜力，突出了将这些过程纳入预测模型以更准确地反映沿海湿地甲烷动态的必要性。
