期刊
ECOLOGY LETTERS
卷 24, 期 6, 页码 1193-1204出版社
WILEY
DOI: 10.1111/ele.13735
关键词
Arctic warming; carbon sequestration; decomposition; functional genes; meta-barcoding; mycorrhizal type; nitrogen cycling; soil fungal communities; stable isotopes; treeline ecotone
类别
资金
- Marie Curie Intra European Fellowship within the 7th European Community Framework Programme
- Swedish University of Agricultural Sciences
- FORMAS grants [2011-1747, 2013655]
This study found that the transition from heath to forest was linked to a sharp decrease in belowground organic stocks, attributed to certain tree-associated ectomycorrhizal fungi contributing to decomposition when extracting N from organic matter. In contrast, ericoid mycorrhizal plants and fungi were associated with organic matter accumulation and slow decomposition.
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 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 associated with organic matter accumulation and slow decomposition. If climatic controls on arctic-alpine forest lines are relaxed, increased decomposition will likely outbalance increased plant productivity, decreasing the overall C sink capacity of displaced tundra.
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