Divergent Responses of Bacterial Communities to Permafrost Degradation and Their Associations With Carbon Across Vertical Profiles.
Chen S, Gu Y, Bahadur A, Liu E, Wu T
Soil Health
Thawing permafrost could release enough carbon to undermine global climate targets, making the soils beneath tundra and high-altitude meadows — and ultimately the growing seasons, rainfall patterns, and plant communities your garden depends on — harder to predict and more extreme.
Scientists drilled 15-meter-deep cores into frozen ground on the Tibetan Plateau and studied the bacteria living at different depths as the permafrost thaws. They found that as the frozen ground degrades, the microbial communities in the upper soil layers become less stable and release more stored carbon. This creates a feedback loop: more warming causes more thawing, which triggers more carbon release, which causes even more warming.
Key Findings
Bacterial diversity decreased with depth across all five 15-meter permafrost cores, while community stability increased — meaning deeper, colder layers host fewer but more resilient microbial communities.
In the active (upper) soil layer, permafrost degradation significantly destabilized bacterial communities and strengthened the negative relationship between community stability and carbon storage, suggesting more carbon is lost as soils warm.
The permafrost layer showed no significant change in community structure along the degradation gradient, indicating the upper active layer is the primary driver of carbon feedback to climate warming.
chevron_right Technical Summary
As permafrost thaws in the Arctic and high-altitude regions, the microbial communities living in frozen soils shift in ways that accelerate carbon release, potentially creating a runaway warming cycle. This study tracked bacteria through deep permafrost cores to show that degradation destabilizes microbial ecosystems in the upper soil layers most, amplifying greenhouse gas emissions.
Abstract Preview
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 ...
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