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In the last decades, recovery from acidification and climate change have caused a widespread dissolved organic carbon (DOC) increase in boreal rivers with impacts on water usages such as compromising drinking water supply. However, there are geographic differences in this increase, but the patterns and drivers remain unclear. To address these differences, we examined the effects of land uses and hydrogeomorphology on shaping DOC historical trends (1985-2019) in the St. Lawrence watershed in 91 stations in 54 different rivers. We measured a widespread increase, particularly in forested regions, but agricultural areas were more stable, or even decreased in DOC. Urban developments were found to have no impacts on historical variations. When adding hydrogeomorphological factors, elevation along with wetlands areas were found to promote DOC increases, emphasizing the importance of hydrogeomorphology and land uses when optimizing water treatment plant facilities.
Primary Presenter: Jade Dormoy-Boulanger, Université du Québec à Trois-Rivières (jade.dormoy@hotmail.com)