Higher CH4 production in permafrost while oxidation prevails in the active layer: Insights from a forest‒wetland ecotone in Northeast China

作者：Xingfeng Dong, Chao Liu, Miao Li, Xiaodong Wu, Zhichao Zheng, Xiang-Wen Wu, Shuying Zang · 发表于：Advances in Climate Change Research · 年份：2025 · DOI：10.1016/j.accre.2025.04.005 · 被引用次数：3 · 研究领域：Climate change and permafrost、Peatlands and Wetlands Ecology、Cryospheric studies and observations

Continuous climate warming results in a deeper active layer and elevated CH 4 emissions. However, our knowledge about the CH 4 production and oxidation potentials in active layers and permafrost remains limited. This study explored the CH 4 production and oxidation potentials in these layers and their responses to temperature variations across two habitats in the Da Xing'an Mountains in northeast China. The results showed that the CH 4 production potential was higher in permafrost than in the active layer across forest and wetland habitats ( p < 0.05). The temperature sensitivity was greater in the active layer (1.98 ± 0.20 in forests, 3.42 ± 0.37 in wetlands) than in permafrost (1.59 ± 0.13 in forests, 2.08 ± 0.34 in wetlands). CH 4 oxidation potential was higher in the active layer than in permafrost ( p < 0.05). However, its temperature sensitivity was higher in permafrost (3.65 ± 0.76 in forests, 2.62 ± 0.50 in wetlands) than in the active layer (3.46 ± 0.66 in forests, 1.90 ± 0.32 in wetlands). The key abiotic driving these processes were pH and soil water content. Amongst microbial properties, CH 4 production was enhanced by the abundance of mcr A genes and methanogenic diversity rather than by community composition. On the contrary, CH 4 oxidation was influenced by pmo A gene abundance, methanotrophic diversity and community composition. Soil parameters and microbial factors accounted for 78% of the variance in CH 4 production and 60% in CH 4 oxidation potential. Overa...