Deployment of aided phytostabilisation at field scale : set up and monitoring lessons

• Main Authors: Bert, Valérie, Manier, Nicolas, Mench, Michel, Boucard, Pierre
• Other Authors: Institut National de l'Environnement Industriel et des Risques (INERIS), Biodiversité, Gènes & Communautés (BioGeCo), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB), KALOGERAKIS, N., MANIOS, T.
• Format: Conference Object
• Language: English
• Published: HAL CCSD 2014
• Subjects: [SDE]Environmental Sciences; [SDV.TOX.ECO]Life Sciences [q-bio]/Toxicology/Ecotoxicology; Greenland
• Online Access: https://hal-ineris.archives-ouvertes.fr/ineris-01855571

In the project GREENLAND (FP7, KBBE-2010-4, 266124) project, one work package aims at testing different phytomanagement options at large field scale to gain information on practical deployment and long term efficiency. Among the network of 13 large trace element (TE) contaminated sites, one located in the Nord-Pasde- Calais region (France), was implemented in September 2011 with aided phytostabilisation, i.e. the combination of plants and soil amendment to reduce the risks associated to the presence of soil TE. The site (1 ha) is part of a large sediment disposal site which was affected by intensive industrial activities. As local authorities are required to manage contaminated landfill sites, they developed a management strategy based on implementation of an environmental management system which aims to meet best practices and comply with environmental regulation in the field of human health and environment. In this context, the objective was to combine aided phytostabilisation with bioenergy production based on Salix cultivation to reduce the environmental risk posed by these sediments and allow the economic valorization of the contaminated sediments via the sale of the produced biomass. Another objective was to test aided phytostabilisation as a strategy to avoid the propagation of the Japanese knotweed, an invasive species that occurred at the sediment landfill site. In a first step, Deschampsia cespitosa, a grass, and Thomas basic slag (TBS), a basic mineral amendment, already tested at field site on an experimental TE contaminated landfill site [1], were used to stabilise the TE of the top sediment. In a second step, a SRC composed of two Salix cultivars (‘Inger’ and Tordis’) was deployed to produce biomass. First results show the success of the plant cover that rapidly reached 100% and the success of the Salix plantation although phytoxicity signs appeared after few months. Several hypotheses were studied of which the grass competition for water and essential nutrients. As the sediment landfill site is ...