A tipping-point in carbon storage when forest expands into tundra is related to mycorrhizal recycling of nitrogen

Karina E Clemmensen, Mikael B Durling, Anders Michelsen, Sara Hallin, Roger D Finlay & Björn D Lindahl
Tundra ecosystems are global belowground sinks for atmospheric CO2. Ongoing warming-induced encroachment by shrubs and trees risks turning this sink into a CO2 source, resulting in a positive feedback on climate warming. To advance mechanistic understanding of how shifts in mycorrhizal types affect long-term carbon (C) and nitrogen (N) stocks, we studied small-scale soil depth profiles of fungal communities and C-N dynamics across a subarctic-alpine forest-heath vegetation gradient. Belowground organic stocks decreased abruptly at the...
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