Abstract
Different sources and fates control riverine dissolved organic matter (DOM) composition in catchments of contrasting land use and climate. However, assessing the changes in DOM composition together with nutrient forms along rivers exposed to these gradients remains rare. Here we quantified the spatial and temporal patterns in DOM components and nutrient forms along the mainstem of a 5th order river through sequential forested, urban, and agricultural reaches during low flow moments in summer and winter, and two contrasting springs, one with a historically rare flooding event. There were widespread abrupt shifts in the composition of DOM in low flow seasons that coincided with changes in land use whose sources could be inferred by endmember samples and nutrient changes. DOM pools considered bio- (microbial-like) and photo-labile (Peak C), along with reactive nutrient forms (ammonium, dissolved phosphorus) tended to accumulate during the winter compared to summer. This implied higher processing during summer as microbial-humic-like DOM and nitrate dominated. DOM composition remained relatively stable under typical spring high flow conditions with reduced retention time and processing, but major shifts were observed during an extreme flood year, pointing to unusual loadings of highly labile DOM. Overall, we found that despite relatively small changes in the quantity of DOM along the axis of flow in this north temperate river, there were major spatial and temporal shifts in its composition, associated with different nutrient forms. These changes inferred contrasting loading and processing potential depending on land use and seasonal patterns in temperature and hydrology.
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Acknowledgements
We wish to thank L. Galantini for continued fieldwork and analysis support, R. LaBrie for help with PARAFAC modelling, and M. Talluto for help with the Bayesian model. We also thank M. Botrel for her curiosity and expertise in data visualisation and D. Bélanger for laboratory analyses support. Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery grants to J.-F.L. and R.M. funded this work, as well as partial student support to S.S. via her NSERC collaborative Research and Training Experience Program (CREATE) EcoLac scholarship. We carried out the work for this article on the traditional lands of the Kanien’kehà:ka (Mohawk), Omàmiwinini (Algonquin) and Anishinabewaki.
Funding
Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery grants to J.-F.L. and R.M. funded this work, as well as partial student support to S.S. via her NSERC collaborative Research and Training Experience Program (CREATE) EcoLac scholarship.
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Shousha, S., Maranger, R. & Lapierre, JF. Contrasting seasons and land uses alter riverine dissolved organic matter composition. Biogeochemistry 161, 207–226 (2022). https://doi.org/10.1007/s10533-022-00979-9
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DOI: https://doi.org/10.1007/s10533-022-00979-9