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Japanese knotweed increases soil erosion on riverbanks

Matte Rébecca, Boivin Maxime et Lavoie Claude. (2022). Japanese knotweed increases soil erosion on riverbanks. River Research and Applications, 38, (3), p. 561-572.

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URL officielle: http://dx.doi.org/doi:10.1002/rra.3918

Résumé

For years, Japanese knotweed (Reynoutria japonica) has been suspected of accelerating riverbank erosion, despite a lack of convincing evidence. The stems of this invasive plant die back following the first autumn frosts, leaving the soil unprotected during winter and spring floods. In Québec (Canada), riverbank erosion may also be accentuated by ice during mechanical ice breakups. The objective of this study was to evaluate the influence of knotweed on riverbank erosion along a river invaded by the species, within a context of floods with ice. The elevation along 120 cross-sectional riverbank profiles, occupied or not by knotweed, was measured before and after the spring flood of 2019. On average, riverbanks occupied by knotweed had nearly 3 cm more soil erosion than riverbanks without knotweed, a statistically significant difference. Stem density also influenced erosion: the higher the density, the greater the soil loss. Certain riverside conditions, such as the slope of the riverbank or being located on an islet, interacted with knotweed, further accentuating erosion. Soil losses measured between November 2018 and May–June 2019 were particularly pronounced, but the spring flood was also exceptional, with a recurrence interval close to 50 years. On the other hand, soil loss from rivers invaded by knotweed can be expected to increase over time, as this invasive species spreads rapidly in riparian habitats.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:38
Numéro:3
Pages:p. 561-572
Version évaluée par les pairs:Oui
Date:2022
Sujets:Sciences naturelles et génie > Sciences appliquées > Eau et environnement
Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Sciences naturelles et génie > Sciences naturelles > Sciences de la terre (géologie, géographie)
Département, module, service et unité de recherche:Départements et modules > Département des sciences humaines > Module des sciences humaines
Unités de recherche > Chaire de recherche sur les espèces aquatiques exploitées (CREAE)
Unités de recherche > Laboratoire d’expertise et de recherche en géographie appliquée
Mots-clés:climate change, erosion, flood, ice, Japanese knotweed, Reynoutria japonica
Déposé le:25 janv. 2023 19:26
Dernière modification:08 févr. 2023 19:11
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