Positive rhizosphere priming accelerates carbon release from permafrost soils.

ABSTRACT: Thawing permafrost soils are predicted to release substantial amounts of carbon by 2100. In addition to this, warming-induced active-layer deepening and increased rooting depth may result in further carbon losses from previously-frozen soil by stimulating microbial communities through fresh carbon inputs inducing positive rhizosphere priming. While models based on temperate data predict significant permafrost carbon loss through rhizosphere priming, data from permafrost soils are lacking. Here, we provide direct evidence of live plant-induced positive rhizosphere priming in permafrost and active-layer soils across diverse soil types from Arctic and Subarctic Canada. By ¹³CO₂ labelling plants in a controlled environment, we show that root activity increases carbon loss

SUBMITTER: Friggens NL 

PROVIDER: S-EPMC12000286 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature