Département de Phytologie, Faculté des Sciences de l'Agriculture et de l'Alimentation, Université Laval, Québec, QC, G1V 0A6, Canada.
Quebec Centre for Biodiversity Science, Department of Biology, McGill University, Montreal, QC, H3A 1B1, Canada.
Environ Manage. 2021 Jun;67(6):1137-1144. doi: 10.1007/s00267-021-01444-3. Epub 2021 Apr 12.
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 discolor-S. eriocephala-S. 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.
柳树被用作河岸土壤生物工程的插条或束，利用其高再生能力和快速生长来控制侵蚀。然而，河岸的水分可用性在时间和空间上都高度变化，这是限制柳树建立的主要压力。鉴于通常建议仅使用当地物种，因此对柳树插条对水分胁迫的反应进行特定物种的理解对于设计成功的河岸土壤生物工程项目至关重要。在为期三个月的温室实验中，我们调查了三种土壤水分处理（干旱-土壤饱和-间歇性洪水）对用于东北美溪流土壤生物工程的三种柳树（S. discolor-S. eriocephala-S. interior）插条的生存、生物量生产和根系生长的影响。所有物种和处理的插条成活率都很高（>89%）。生物量生产和根体积仅在物种之间存在差异。S. eriocephala 产生的生物量和根体积最高，而 S. discolor 比地上生物量更多地投资于地下生物量。根系长度对不同物种的土壤水分有不同的反应。在间歇性洪水下，S. eriocephala 产生的根系较短，而 S. interior 产生的根系较长。对于河岸土壤生物工程，S. eriocephala 应在中海拔处受到青睐，而 S. interior 应在低海拔处受到青睐。
