作者：
Karina Engelbrecht Clemmensen
發布時間：
2021
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09
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01
點擊次數：
0
原名：A tipping point in carbon storage when forest expands into tundra is related to mycorrhizal recycling of nitrogen譯名：森林擴展到苔原的碳儲存臨界點與菌根氮循環有關期刊：Ecology LettersIF：9.492發表時間：2021年2月23日第一作者: Karina Engelbrecht Clemmensen通訊作者：Karina Engelbrecht Clemmensen主要單位：瑞典農業大學#1AbstractTundra 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 transition from heath to forest, linked to the presence of certain tree-associated ectomycorrhizal fungi that contribute to decomposition when mining N from organic matter. In contrast, ericoid mycorrhizal plants and fungi were...