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Rhizosphere allocation by canopy-forming species dominates soil CO2 efflux in a subarctic landscape

Parker, Thomas C. and Engelbrecht Clemmensen, Karina and Friggens, Nina L. and Hartley, Iain P. and Johnson, David and Lindahl, Björn and Olofsson, Johan and Siewert, Matthias B. and Street, Lorna E. and Subke, Jens-Arne and Wookey, Philip A. (2020). Rhizosphere allocation by canopy-forming species dominates soil CO2 efflux in a subarctic landscape. New Phytologist. 227 , 1818-1830
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Abstract

In arctic ecosystems, climate change has increased plant productivity. As arctic carbon (C) stocks predominantly are located belowground, the effects of greater plant productivity on soil C storage will significantly determine the net sink/source potential of these ecosystems, but vegetation controls on soil CO2 efflux remain poorly resolved.In order to identify the role of canopy-forming species in belowground C dynamics, we conducted a girdling experiment with plots distributed across 1 km(2) of treeline birch (Betula pubescens) forest and willow (Salix lapponum) patches in northern Sweden and quantified the contribution of canopy vegetation to soil CO2 fluxes and belowground productivity.Girdling birches reduced total soil CO2 efflux in the peak growing season by 53%, which is double the expected amount, given that trees contribute only half of the total leaf area in the forest. Root and mycorrhizal mycelial production also decreased substantially. At peak season, willow shrubs contributed 38% to soil CO2 efflux in their patches.Our findings indicate that C, recently fixed by trees and tall shrubs, makes a substantial contribution to soil respiration. It is critically important that these processes are taken into consideration in the context of a greening arctic because productivity and ecosystem C sequestration are not synonymous.

Authors/Creators:Parker, Thomas C. and Engelbrecht Clemmensen, Karina and Friggens, Nina L. and Hartley, Iain P. and Johnson, David and Lindahl, Björn and Olofsson, Johan and Siewert, Matthias B. and Street, Lorna E. and Subke, Jens-Arne and Wookey, Philip A.
Title:Rhizosphere allocation by canopy-forming species dominates soil CO2 efflux in a subarctic landscape
Year of publishing :2020
Volume:227
Page range:1818-1830
Number of Pages:13
ISSN:0028-646X
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 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, ectomycorrhizal fungi, girdling, rhizosphere, shrub expansion, soil CO2 efflux, treeline
URN:NBN:urn:nbn:se:slu:epsilon-p-105693
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-105693
Additional ID:
Type of IDID
DOI10.1111/nph.16573
Web of Science (WoS)000531561300001
ID Code:17617
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
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:29 Sep 2020 10:30
Metadata Last Modified:29 Sep 2020 10:31

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