Divergent Responses of Bacterial Communities to Permafrost Degradation and Their Associations With Carbon Across Vertical Profiles
Source abstract
Abstract
ABSTRACT Permafrost degradation poses a significant threat to the organic carbon (C) pool primarily through regulating microorganisms. However, microbial responses and their associations with C loss across vertical profiles remain unclear. Here, we use metagenomic sequencing to investigate bacterial communities in 125 samples from five 15 m‐depth permafrost cores, spanning from the active layer to the permafrost layer along a degradation gradient on the Qinghai‐Tibet Plateau. We find that α ‐diversity decreases, while stochastic processes and community stability increase from the active layer to the permafrost layer. Along permafrost degradation, these community attributes follow similar variations within the active layer but remain constant within the permafrost layer. The relative abundance and interaction of core taxa play important roles in maintaining community stability in the active and permafrost layers, respectively. As permafrost degrades, the negative relationships between community stability and C storage become more intense, especially in the active layer. These findings demonstrate that degradation induces microbial responses that potentially amplify C release, supporting a positive feedback loop to climate warming. Our work provides novel insights into the vertical heterogeneity of this mechanism and is crucial for modeling future permafrost C dynamics.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Climate change and permafrost · Polar Research and Ecology · Soil Carbon and Nitrogen Dynamics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Cryosphere and Eco‐Environment Research Station of Shule River Headwaters, State Key Laboratory of Cryospheric Science and Frozen Soil Engineering, Northwest Institute of Eco‐Environment and Resources Chinese Academy of Sciences Lanzhou Gansu China
College of Ecology Lanzhou University Lanzhou Gansu China
University of Chinese Academy of Sciences Beijing China
College of Grassland Agriculture Northwest A&F University Yangling Shaanxi China
Cryosphere Research Station on the Qinghai‐Tibet Plateau Chinese Academy of Sciences Lanzhou Gansu China
State Key Laboratory of Genome and Multi‐omics Technologies BGI Research Shenzhen China
Institute of Ecology, Key Laboratory for Earth Surface Processes of the Ministry of Education, College of Urban and Environmental Sciences Peking University Beijing China
Long‐term National Scientific Research Base of the Qilian Mountain National Park Xining Qinghai China
Institute of Environment and Ecology, Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen China
Funding
National Key Research and Development Program of China · National Natural Science Foundation of China · Science and Technology Program of Gansu Province
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