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

Zhu, Xudan and Chen, Liang and Pumpanen, Jukka and Ojala, Anne and Zobitz, John and Zhou, Xuan and Laudon, Hjalmar and Palviainen, Marjo and Neitola, Kimmo and Berninger, Frank (2022). The role of terrestrial productivity and hydrology in regulating aquatic dissolved organic carbon concentrations in boreal catchments. Global Change Biology. 28 :8 , 2764-2778
[Research article]

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Abstract

The past decades have witnessed an increase in dissolved organic carbon (DOC) concentrations in the catchments of the Northern Hemisphere. Increasing terrestrial productivity and changing hydrology may be reasons 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 3 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 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, gross primary production (GPP) and RE accounted for 26%, 22% and 3%, respectively. The impact of GPP and discharge on DOC changes was directly related to catchment size: GPP dominated DOC fluctuations in small catchments (<1 km(2)), whereas discharge controlled DOC variations in big catchments (>1 km(2)). The direction of the relation between GPP and discharge on DOC varied. Increasing RE always made a positive contribution to DOC concentration. This study reveals that climate change-induced terrestrial greening and shifting hydrology change the DOC export from terrestrial to aquatic ecosystems. The work improves our mechanistic understanding of surface water DOC regulation in boreal catchments and confirms the importance of DOC fluxes in regulating ecosystem C budgets.

Authors/Creators:Zhu, Xudan and Chen, Liang and Pumpanen, Jukka and Ojala, Anne and Zobitz, John and Zhou, Xuan and Laudon, Hjalmar and Palviainen, Marjo and Neitola, Kimmo and Berninger, Frank
Title:The role of terrestrial productivity and hydrology in regulating aquatic dissolved organic carbon concentrations in boreal catchments
Series Name/Journal:Global Change Biology
Year of publishing :2022
Volume:28
Number:8
Page range:2764-2778
Number of Pages:15
Publisher:WILEY
ISSN:1354-1013
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial-No Derivative Works 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
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords:boreal catchments, catchment size, discharge, DOC, GPP, landscape, RE, terrestrial productivity
URN:NBN:urn:nbn:se:slu:epsilon-p-116166
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-116166
Additional ID:
Type of IDID
DOI10.1111/gcb.16094
Web of Science (WoS)000749655000001
ID Code:27446
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Ecology and Management
Deposited By: SLUpub Connector
Deposited On:28 Mar 2022 09:25
Metadata Last Modified:28 Mar 2022 09:31

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