Thaw can unlock missing microbial functions—and more greenhouse gas production
WHAT THE EVIDENCE SAYS
In 389-day incubations across four permafrost types, adding multifunctional active-layer microbial inocula increased carbon dioxide production by roughly 20–60% across all soils and triggered nitrous oxide production in two. Functional limitations and community coalescence differed among soils.
WHY IT MATTERS / OUR READ
Permafrost response depends not only on what substrates thaw exposes but also on which microbial functions can arrive and establish. Dispersal and community assembly may therefore change greenhouse-gas trajectories after thaw.
CAVEATS / UNCERTAINTY
The experiment used laboratory incubations and deliberate inoculation, not natural field dispersal. The magnitude and persistence of these effects under real thaw, hydrology and plant interactions remain uncertain.
SOURCE
Nature Communications
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EvidencePeer-reviewedGeographyExperimental soils spanning four widespread permafrost typesSystemPermafrost soils WHAT THE EVIDENCE SAYS In 389-day incubations across four permafrost types, adding multifunctional active-layer microbial inocula increased carbon dioxide
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