Vertical distribution patterns and potential activities of methanogenic and methanotrophic communities in permafrost peatlands of Greater Khingan Mountains

作者：Anwen Liu, Weiping Yin, Dalong Ma, Xu Wang, Shuping Kan · 发表于：Ecological Indicators · 年份：2025 · DOI：10.1016/j.ecolind.2025.113539 · 被引用次数：6 · 研究领域：Methane Hydrates and Related Phenomena、Peatlands and Wetlands Ecology、Climate change and permafrost

Peatlands are dominant sources of methane (CH 4 ), and warming-induced permafrost degradation alters vegetation composition and water table, which dramatically reshape the microbial-mediated CH 4 cycling processes, possibly resulting in strong positive feedbacks of carbon loss and climate change. It is essential to understand the biological mechanisms of CH 4 emission by peatlands for future climate projections. Here, we examined the vertical distribution patterns of methanogen and methanotroph community composition, abundance, and activities in three different peatlands along the peatland-forest ecotone transect of the Greater Khingan Mountains permafrost region in Northern China. The alpha diversity of methanogens and methanotrophs was higher in the transitional layer compared to the deep anoxic and upper oxic layers. Hydrogenotrophic methanogens were absolutely dominant in tussock peatland (TP), whereas methylotrophic methanogens increased in forested peatland (FP) and shrubby peatland (SP). Type II methanotrophs were dominant in FP and SP, while type I methanotrophs dominated in TP. Co-occurrence network analysis revealed that environmental filtering had a slight effect on methanogen communities, but the complexity and stability of methanotroph communities decreased from TP to FP. Potential methane production rates (MPR) and methane oxidation rates (MOR) reached a maximum in the deep anoxic and transitional layers, respectively, and mcrA gene abundance increased along the...