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Controls on terrestrial carbon fluxes in simulated networks of connected streams and lakes
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.ORCID iD: 0000-0003-1157-5240
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.ORCID iD: 0000-0002-5758-2705
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0002-7181-9940
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.ORCID iD: 0000-0001-5730-0694
2023 (English)In: Global Biogeochemical Cycles, ISSN 0886-6236, E-ISSN 1944-9224, Vol. 37, no 3, article id e2022GB007597Article in journal (Refereed) Published
Abstract [en]

Inland waters play a critical role in the carbon cycle by emitting significant amounts of land-exported carbon to the atmosphere. While carbon gas emissions from individual aquatic systems have been extensively studied, how networks of connected streams and lakes regulate integrated fluxes of organic and inorganic forms remain poorly understood. Here, we develop a process-based model to simulate the fate of terrestrial dissolved organic carbon (DOC) and carbon dioxide (CO2) in artificial inland water networks with variable topology, hydrology, and DOC reactivity. While the role of lakes is highly dependent on DOC reactivity, we find that the mineralization of terrestrial DOC is more efficient in lake-rich networks. Regardless of typology and hydrology, terrestrial CO2 is emitted almost entirely within the network boundary. Consequently, the proportion of exported terrestrial carbon emitted from inland water networks increases with the CO2 versus DOC export ratio. Overall, our results suggest that CO2 emissions from inland waters are governed by interactions between the relative amount and reactivity of terrestrial DOC and CO2 inputs and the network configuration of recipient lakes and streams.

Place, publisher, year, edition, pages
John Wiley & Sons, 2023. Vol. 37, no 3, article id e2022GB007597
Keywords [en]
aquatic network, carbon cycle, CO2 emission, DOC mineralization, modeling
National Category
Ecology Geosciences, Multidisciplinary
Identifiers
URN: urn:nbn:se:umu:diva-206457DOI: 10.1029/2022GB007597ISI: 000973568600001Scopus ID: 2-s2.0-85151084699OAI: oai:DiVA.org:umu-206457DiVA, id: diva2:1750350
Funder
The Kempe Foundations, 2016.0083Swedish Research Council, 2020-04445Available from: 2023-04-13 Created: 2023-04-13 Last updated: 2023-09-05Bibliographically approved

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Vachon, DominicSponseller, Ryan A.Rosvall, MartinKarlsson, Jan

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Vachon, DominicSponseller, Ryan A.Rosvall, MartinKarlsson, Jan
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Global Biogeochemical Cycles
EcologyGeosciences, Multidisciplinary

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CiteExportLink to record
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Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
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  • Other style
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  • de-DE
  • en-GB
  • en-US
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  • nn-NO
  • nn-NB
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  • Other locale
More languages
Output format
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  • text
  • asciidoc
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