Journal
SCIENTIFIC REPORTS
Volume 6, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep25607
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Funding
- CryoCARB project (Long-term Carbon Storage in Cryoturbated Arctic Soils)
- Austrian Science Fund (FWF) [I370-B17]
- German Federal Ministry of Education and Research [03F0616A]
- Czech Ministry of Education, Youth and Sports (MSM) [7E10073]
- Russian Ministry of Education and Science [14..25.31.0031]
- Swedish Research Council [824-2009-77357]
- Norwegian Research Fund (NFR) [NFR-200411]
- Natural Environment Research Council [ceh010010] Funding Source: researchfish
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Arctic ecosystems are warming rapidly, which is expected to promote soil organic matter (SOM) decomposition. In addition to the direct warming effect, decomposition can also be indirectly stimulated via increased plant productivity and plant-soil C allocation, and this so called priming effect might significantly alter the ecosystem C balance. In this study, we provide first mechanistic insights into the susceptibility of SOM decomposition in arctic permafrost soils to priming. By comparing 119 soils from four locations across the Siberian Arctic that cover all horizons of active layer and upper permafrost, we found that an increased availability of plant-derived organic C particularly stimulated decomposition in subsoil horizons where most of the arctic soil carbon is located. Considering the 1,035 Pg of arctic soil carbon, such an additional stimulation of decomposition beyond the direct temperature effect can accelerate net ecosystem C losses, and amplify the positive feedback to global warming.
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