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Cited by 15Marine and coastal ecosystemsSoil and Water Nutrient DynamicsWater Quality and Resources Studies

Composition of Stream Dissolved Organic Matter Across Canadian Forested Ecozones Varies in Three Dimensions Linked to Landscape and Climate

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Orlova, Julia, Amiri, Fariba, Bourgeois, Alyssa K., Buttle, Jim M., Cherlet, Erin, Cuss, Chad W., Devito, Kevin J., Emelko, Monica B. +12 more·2024·Water Resources Research
DOI 10.1029/2023wr035196
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Abstract

Dissolved organic matter (DOM) is a key variable influencing aquatic ecosystem processes. The concentration and composition of DOM in streams depend on both the delivery of DOM from terrestrial sources and on aquatic DOM production and degradation. However, there is limited understanding of the variability of stream DOM composition at continental scales and the influence of landscape characteristics and disturbances on DOM across different regions. We assessed DOM composition in 52 streams at seven research sites across six forested ecozones in Canada in 2019–2022 using 26 indices derived from five analytical approaches: absorbance and fluorescence spectroscopy, liquid chromatography—organic carbon detection, Fourier‐transform ion cyclotron resonance mass spectrometry, and asymmetric flow field‐flow fractionation. Combined analyses showed clear clustering and redundancy across analytical techniques, and indicated that compositional variations were primarily related to three axes of DOM composition: (a) aromaticity, which was greater in low‐relief, wetland‐dominated catchments, (b) oxygenation, which was greater in colder and drier ecozones, and (c) biopolymer content, which was greater in lake‐influenced catchments. Variability in DOM composition among research sites was greater than variability of streams within a site and variability over time within a stream. Forest harvesting and wildfire disturbances had no common influence on DOM composition across research sites, emphasizing the need for regional studies. Our study provides a broad understanding of the variability of stream DOM composition and its associations with landscape and catchment characteristics at a subcontinental scale, and provides key insights for the choice and interpretation of DOM indices from various analytical approaches.

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  • Compared with non-industrial regions, (H/C)wa values were higher than agriculturally impacted rivers of Tibetan Plateau and forested ecozones of Canada, while (O/C)wa values were lower than agriculture and forest areas.

    “However, compared with non-industrial regions, (H/C)wa values were higher than agriculturally impacted rivers of Tibetan Plateau, China ((H/C)wa = 1.19) and forested ecozones of Canada (H/C: 1.10 ~ 1.31), while (O/C)wa values were lower than agriculture((O/C)wa = 0.41) and forest areas (O/C: 0.47 ~ 0.62) (Nai et al., 2023; Orlova et al., 2024).”

    From Molecular characteristics of emerging perfluoroalkyl and polyfluoroalkyl substances (PFAS) and dissolved organic matter (DOM) in surface waters around fluorine-related industries in a Chinese Megacity (2025) · cites this paper as Orlova et al., 2024

    Section 2.1 identifies the sampled Canadian forested ecozones, and Section 2.3.3 says their samples’ H/C and O/C ratios were calculated as intensity-weighted averages. The passages from our copy do not give the cited Canadian ranges of H/C 1.10–1.31 and O/C 0.47–0.62, so those numerical comparisons cannot be verified from this source. (LLM, conf=0.82)

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Authors
Orlova, J., Amiri, F., Bourgeois, A. K., Buttle, J. M., Cherlet, E., Cuss, C. W., Devito, K. J., Emelko, M. B., Floyd, W. C., Foster, D. E., Hutchins, R. H. S., Jamieson, R., Johnson, M. S., McSorley, H. J., Silins, U., Tank, S. E., Thompson, L. M., Webster, K. L., Williams, C. H. S., & Olefeldt, D.
Affiliations
  • University of Alberta (CA)
  • University of Waterloo (CA)
  • Trent University (CA)
  • Memorial University of Newfoundland (CA)
  • Vancouver Island University (CA)
  • Dalhousie University (CA)
  • University of British Columbia (CA)
  • Natural Resources Canada (CA)
  • Government of British Columbia (CA)
Corresponding author
Olefeldt, David
ORCID
Venue
Water Resources Research
Publisher
American Geophysical Union (AGU)
Published
2024-05
Volume
60
Issue
5
ISSN
  • 0043-1397 (ISSN-L)
  • 1944-7973
DOI
10.1029/2023wr035196
OpenAlex
W4396731041
Cited by
15
References
3
Citations by year
2026: 9 · 2025: 4 · 2024: 2
FWCI
2.95
Type
journal article
Language
en
Open access
Licence
Locations
  • Water Resources Research (publishedVersion, cc-by-nc-nd)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
Natural Sciences and Engineering Research Council of Canada (NETGP‐494312‐16)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal ecosystems
  • Physical Sciences › Environmental Science › Environmental Chemistry › Soil and Water Nutrient Dynamics
  • Physical Sciences › Environmental Science › Water Science and Technology › Water Quality and Resources Studies
Keywords
dissolved organic matter, aromaticity, oxygenation, wildfire disturbance, DOM degradation, Canadian forests

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