The role of terrestrial productivity in regulating aquatic dissolved organic carbon concentrations in boreal catchments

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dc.contributor.affiliationUniversity of Eastern Finland - Zhu, Xudan
dc.contributor.affiliationUniversity of Eastern Finland - Chen, Liang
dc.contributor.affiliationUniversity of Eastern Finland - Pumpanen, Jukka
dc.contributor.affiliationNatural Resources Institute Finland - Ojala, Anne
dc.contributor.affiliationAugsburg University - Zobitz, John
dc.contributor.affiliationUniversity of Eastern Finland - Zhou, Xuan
dc.contributor.affiliationSwedish University of Agricultural Sciences - Laudon, Hjalmar
dc.contributor.affiliationUniversity of Helsinki - Palviainen, Marjo
dc.contributor.affiliationUniversity of Helsinki - Neitola, Kimmo
dc.contributor.affiliationUniversity of Eastern Finland - Berninger, Frank
dc.contributor.authorZhu, Xudan
dc.contributor.authorChen, Liang
dc.contributor.authorPumpanen, Jukka
dc.contributor.authorOjala, Anne
dc.contributor.authorZobitz, John
dc.contributor.authorZhou, Xuan
dc.contributor.authorLaudon, Hjalmar
dc.contributor.authorPalviainen, Marjo
dc.contributor.authorNeitola, Kimmo
dc.contributor.authorBerninger, Frank
dc.date.accessioned2025-03-24T15:19:07Z
dc.date.issued2022-01-31
dc.date.issued2022-01-31
dc.descriptionThe past decades have witnessed an increase in dissolved organic carbon (DOC) concentrations in the catchments of the Northern Hemisphere. Increases in terrestrial productivity may be a reason for the increases in DOC concentration. The aim of this study is to investigate the impacts of increased terrestrial productivity and changed hydrology following climate change on DOC concentrations. We tested and quantified the effects of gross primary production (GPP), ecosystem respiration (RE) and discharge on DOC concentrations in boreal catchments over three years. As catchment characteristics can regulate the extent of rising DOC concentrations caused by the regional or global environmental changes, we selected four catchments with different sizes (small, medium and large) and landscapes (forest, mire and forest-mire mixed). We applied multiple models: Wavelet coherence analysis detected the delay-effects of terrestrial productivity and discharge on aquatic DOC variations of boreal catchments; thereafter, the distributed-lag linear models (DLMs) quantified the contributions of each factor on DOC variations. Our results showed that the combined impacts of terrestrial productivity and discharge explained 62% of aquatic DOC variations on average across all sites, whereas discharge, GPP and RE accounted for 26%, 22% and 3%, respectively. GPP dominated the DOC variations in small catchments (<1 km2), but in large catchments, DOC variations were mainly dependent on discharge. The direction of the relation between GPP and discharge on DOC varied. Increasing RE always made a positive contribution to DOC concentration. This study demonstrated that terrestrial greening and changing hydrology caused by climate change did affect the DOC export from terrestrial to aquatic ecosystems, which improves the mechanistic understanding of surface water DOC regulation in boreal catchments under climate change.
dc.identifierhttps://doi.org/10.5061/dryad.wpzgmsbp9
dc.identifier.urihttps://hydatakatalogi-test-24.it.helsinki.fi/handle/123456789/10397
dc.rightsOpen
dc.rights.licensecc-zero
dc.subjectboreal catchments
dc.subjectDOC
dc.subjectterrestrial productivity
dc.subjectGPP
dc.subjectDischarge
dc.subjectcatchment size
dc.subjectlandscape
dc.titleThe role of terrestrial productivity in regulating aquatic dissolved organic carbon concentrations in boreal catchments
dc.typedataset
dc.typedataset

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