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

Engelbrecht Clemmensen, Karina and Brandström Durling, Mikael and Michelsen, Anders and Hallin, Sara and Finlay, Roger and Lindahl, Björn (2021). A tipping point in carbon storage when forest expands into tundra is related to mycorrhizal recycling of nitrogen. Ecology Letters. 24 , 1193-1204
[Research article]

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Abstract

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.

Authors/Creators:Engelbrecht Clemmensen, Karina and Brandström Durling, Mikael and Michelsen, Anders and Hallin, Sara and Finlay, Roger and Lindahl, Björn
Title:A tipping point in carbon storage when forest expands into tundra is related to mycorrhizal recycling of nitrogen
Series Name/Journal:Ecology Letters
Year of publishing :2021
Volume:24
Page range:1193-1204
Number of Pages:12
Publisher:WILEY
ISSN:1461-023X
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:Arctic warming, carbon sequestration, decomposition, functional genes, meta-barcoding, mycorrhizal type, nitrogen cycling, soil fungal communities, stable isotopes, treeline ecotone
URN:NBN:urn:nbn:se:slu:epsilon-p-111313
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-111313
Additional ID:
Type of IDID
DOI10.1111/ele.13735
Web of Science (WoS)000631277200001
ID Code:24361
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
S - Faculty of Forest Sciences
Department:(NL, NJ) > Dept. of Forest Mycology and Plant Pathology
(S) > Dept. of Forest Mycology and Plant Pathology

(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: SLUpub Connector
Deposited On:02 Jun 2021 11:23
Metadata Last Modified:02 Jun 2021 11:31

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