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Global CO2 fertilization of Sphagnum peat mosses via suppression of photorespiration during the twentieth century

Serk, Henrik and Nilsson, Mats and Bohlin, Elisabet and Ehlers, Ina and Wieloch, Thomas and Olid, Carolina and Grover, Samantha and Kalbitz, Karsten and Limpens, Juul and Moore, Tim and Munchberger, Wiebke and Talbot, Julie and Wang, Xianwei and Knorr, Klaus-Holger and Pancotto, Veronica and Schleucher, Jurgen (2021). Global CO2 fertilization of Sphagnum peat mosses via suppression of photorespiration during the twentieth century. Scientific Reports. 11 :1 , 24517
[Research article]

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Abstract

Natural peatlands contribute significantly to global carbon sequestration and storage of biomass, most of which derives from Sphagnum peat mosses. Atmospheric CO2 levels have increased dramatically during the twentieth century, from 280 to > 400 ppm, which has affected plant carbon dynamics. Net carbon assimilation is strongly reduced by photorespiration, a process that depends on the CO2 to O-2 ratio. Here we investigate the response of the photorespiration to photosynthesis ratio in Sphagnum mosses to recent CO2 increases by comparing deuterium isotopomers of historical and contemporary Sphagnum tissues collected from 36 peat cores from five continents. Rising CO2 levels generally suppressed photorespiration relative to photosynthesis but the magnitude of suppression depended on the current water table depth. By estimating the changes in water table depth, temperature, and precipitation during the twentieth century, we excluded potential effects of these climate parameters on the observed isotopomer responses. Further, we showed that the photorespiration to photosynthesis ratio varied between Sphagnum subgenera, indicating differences in their photosynthetic capacity. The global suppression of photorespiration in Sphagnum suggests an increased net primary production potential in response to the ongoing rise in atmospheric CO2, in particular for mire structures with intermediate water table depths.

Authors/Creators:Serk, Henrik and Nilsson, Mats and Bohlin, Elisabet and Ehlers, Ina and Wieloch, Thomas and Olid, Carolina and Grover, Samantha and Kalbitz, Karsten and Limpens, Juul and Moore, Tim and Munchberger, Wiebke and Talbot, Julie and Wang, Xianwei and Knorr, Klaus-Holger and Pancotto, Veronica and Schleucher, Jurgen
Title:Global CO2 fertilization of Sphagnum peat mosses via suppression of photorespiration during the twentieth century
Series Name/Journal:Scientific Reports
Year of publishing :2021
Volume:11
Number:1
Article number:24517
Number of Pages:11
Publisher:NATURE PORTFOLIO
ISSN:2045-2322
Language:English
Publication Type:Research 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 > 105 Earth and Related Environmental Sciences > Climate Research
URN:NBN:urn:nbn:se:slu:epsilon-p-115404
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-115404
Additional ID:
Type of IDID
DOI10.1038/s41598-021-02953-1
Web of Science (WoS)000736810100008
ID Code:27136
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Ecology and Management
Deposited By: SLUpub Connector
Deposited On:18 Feb 2022 10:25
Metadata Last Modified:18 Feb 2022 10:31

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