Univ. Grenoble Alpes, Irstea, UR LESSEM, 2 rue de la Papeterie-BP 76, St-Martin-d'Hères, F-38402, France.
Électricité de France, Centre d'Ingénierie Hydraulique, Service Environnement et Société Savoie Technolac - 4, allée du lac de Tignes, La Motte Servolex, 73290, France.
Environ Manage. 2019 Aug;64(2):178-189. doi: 10.1007/s00267-019-01180-9. Epub 2019 Jun 26.
Restoration of riverbanks through soil bioengineering techniques allows managers to combine riverbank stability and riparian ecosystem functioning. This restoration often involves the sowing of a seed mixture, which helps develop herbaceous vegetation. This development and sufficient vegetation cover are essential for protection against erosion and for hosting biodiversity, two of the main goals of riverbank bioengineering. Restoration aims at recreating ecosystems closer to an undisturbed state; choosing seed mixtures of local provenance is therefore encouraged. In this study, we investigated the local seed mixture sown on bioengineered riverbanks and the conditions influencing the first steps of plant development, so as to delineate the setting favoring restoration. We focused on the composition of the seed mixture and germination capacity as well as the effect of sowing density and soil quality on vegetation cover and diversity. We tested four sowing densities: 5, 10, 15, and 30 g.m. The seed mixture presented considerable diversity and germination rates were heterogeneous. Sowing density had a positive impact on vegetation cover and diversity, and high cover up to 100% was rapidly reached. Soil quality did not affect vegetation diversity but had a significant effect on vegetation cover, with the nutrient content, notably nitrogen, most probably involved.
通过土壤生物工程技术恢复河岸，使管理者能够兼顾河岸稳定性和河岸生态系统功能。这种恢复通常涉及播种种子混合物，有助于草本植被的生长。这种生长和充足的植被覆盖对于防止侵蚀和维持生物多样性至关重要，这是河岸生物工程的两个主要目标。恢复的目的是重建更接近自然状态的生态系统；因此，鼓励选择来自当地的种子混合物。在这项研究中，我们调查了生物工程河岸上播种的本地种子混合物，以及影响植物发育初期的条件，以划定有利于恢复的环境。我们专注于种子混合物的组成和发芽能力，以及播种密度和土壤质量对植被覆盖和多样性的影响。我们测试了四种播种密度：5、10、15 和 30 克/平方米。种子混合物具有相当大的多样性，发芽率也存在差异。播种密度对植被覆盖和多样性有积极影响，高覆盖率（高达 100%）迅速达到。土壤质量不会影响植被多样性，但会对植被覆盖产生显著影响，其中可能涉及到氮等营养物质。
