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CO2 fertilization of Sphagnum peat mosses is modulated by water table level and other environmental factors
Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics. Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden.ORCID iD: 0000-0003-4803-3664
Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden.
Umeå University, Faculty of Science and Technology, Department of Chemistry.ORCID iD: 0000-0001-8819-2278
Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.ORCID iD: 0000-0001-9162-2291
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2021 (English)In: Plant, Cell and Environment, ISSN 0140-7791, E-ISSN 1365-3040, Vol. 44, no 6, p. 1756-1768Article in journal (Refereed) Published
Abstract [en]

Sphagnum mosses account for most accumulated dead organic matter in peatlands. Therefore, understanding their responses to increasing atmospheric CO2 is needed for estimating peatland C balances under climate change. A key process is photorespiration: a major determinant of net photosynthetic C assimilation that depends on the CO2 to O2 ratio. We used climate chambers to investigate photorespiratory responses of Sphagnum fuscum hummocks to recent increases in atmospheric CO2 (from 280 to 400 ppm) under different water table, temperature, and light intensity levels. We tested the photorespiratory variability using a novel method based on deuterium isotopomers (D6S/D6R ratio) of photosynthetic glucose. The effect of elevated CO2 on photorespiration was highly dependent on water table. At low water table (−20 cm), elevated CO2 suppressed photorespiration relative to C assimilation, thus substantially increasing the net primary production potential. In contrast, a high water table (~0 cm) favored photorespiration and abolished this CO2 effect. The response was further tested for Sphagnum majus lawns at typical water table levels (~0 and −7 cm), revealing no effect of CO2 under those conditions. Our results indicate that hummocks, which typically experience low water table levels, benefit from the 20th century's increase in atmospheric CO2.

Place, publisher, year, edition, pages
John Wiley & Sons, 2021. Vol. 44, no 6, p. 1756-1768
Keywords [en]
atmospheric CO2, carbon assimilation, climate change, deuterium isotopomers, NMR, photorespiration, sphagnum
National Category
Ecology
Identifiers
URN: urn:nbn:se:umu:diva-181931DOI: 10.1111/pce.14043ISI: 000634449500001PubMedID: 33751592Scopus ID: 2-s2.0-85103225620OAI: oai:DiVA.org:umu-181931DiVA, id: diva2:1541662
Available from: 2021-04-01 Created: 2021-04-01 Last updated: 2023-03-24Bibliographically approved

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Serk, HenrikFigueira, JoaoWieloch, ThomasSchleucher, Jürgen

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