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Growth Response of Cuttings to Drought and Intermittent Flooding for Three Salix Species and Implications for Riverbank Soil Bioengineering

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Abstract

Willows are used as cuttings or in fascines for riverbank soil bioengineering, to control erosion with their high resprouting ability and rapid growth. However, water availability is highly variable along riverbanks both in time and space and constitutes a major stress limiting willow establishment. A species-specific understanding of willow cutting response to water stress is critical to design successful riverbank soil bioengineering projects given exclusive use of local species is often recommended. In a three-month greenhouse experiment, we investigated the effects of three soil moisture treatments (drought—soil saturation—intermittent flooding) on survival, biomass production and root growth of cuttings of three willow species used for soil bioengineering along NE American streams (Salix discolorS. eriocephalaS. interior). Cutting survival was high for all species and treatments (>89%). Biomass production and root volume only differed between species. S. eriocephala produced the highest biomass and root volume, and S. discolor invested more in belowground than aboveground biomass. Root length responded to soil moisture differently between species. Under intermittent flooding, S. eriocephala produced shorter roots, while S. interior produced longer roots. For riverbank soil bioengineering, S. eriocephala should be favored at medium elevation and S. interior at lower elevation.

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Acknowledgements

This study was supported by the FASAM project (Formation pour la sécurité alimentaire au Mali), the Natural Sciences and Engineering Research Council of Canada (Discovery grant RGPIN-2014-05663 to MP), the Quebec Ministry of Transport, and the Quebec Ministry of International Relations through the 66th session of the program Cooperation France-Québec. The authors thank Isabelle Clermont, Steeve Pépin, and field assistants for their help during experiment set-up and monitoring as well as Hélène Crépeau for statistical advice.

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Correspondence to Monique Poulin.

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Keita, N., Bourgeois, B., Evette, A. et al. Growth Response of Cuttings to Drought and Intermittent Flooding for Three Salix Species and Implications for Riverbank Soil Bioengineering. Environmental Management 67, 1137–1144 (2021). https://doi.org/10.1007/s00267-021-01444-3

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  • DOI: https://doi.org/10.1007/s00267-021-01444-3

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