title: Differential allelopathic effects of Japanese knotweed on willow and cottonwood cuttings used in riverbank restoration techniques.
abstract: Using bioengineering techniques to restore areas invaded by Fallopia japonica shows promising results. Planting tree cuttings could allow both rapidly re-establishing a competitive native plant community and reducing F. japonica performance. However, F. japonica has been shown to affect native plant species through different mechanisms such as allelopathy. This article investigates the phytotoxic effect of F. japonica on the resprouting capacity and the growth of three Salicaceae species with potential value for restoration. An experimental design which physically separates donor pots containing either an individual from F. japonica or bare soil from target pots containing cuttings of Populus nigra, Salix atrocinerea or Salix viminali was used. Leachates from donor pots were used to water target pots. The effects of leachates were evaluated by measuring the final biomass of the cuttings. F. japonica leachates inhibited the growth of cuttings, and this effect is linked to the emission of polyphenol compounds by F. japonica. Leachates also induced changes in soil nitrogen composition. These results suggest the existence of allelopathic effects, direct and/or indirect, of F. japonica on the growth of Salicaceae species cuttings. However, the three species were not equally affected, suggesting that the choice of resistant species could be crucial for restoration success.
authors.affiliation: Irstea, EMGR, Research Unit Mountain Ecosystems, 2 rue de la Papeterie, BP 76, F-38402 Saint-Martin-d'Hères, France; AgroParisTech, ENGREF, Research Unit Mountain Ecosystems, 2 rue de la Papeterie, BP 76, F-38402 Saint-Martin-d'Hères, France. Electronic address: fanny.dommanget@irstea.fr.
authors.forename: Fanny
authors.initials: F
authors.lastname: Dommanget
authors.affiliation: Irstea, EMGR, Research Unit Mountain Ecosystems, 2 rue de la Papeterie, BP 76, F-38402 Saint-Martin-d'Hères, France.
authors.forename: André
authors.initials: A
authors.lastname: Evette
authors.affiliation: Irstea, EMGR, Research Unit Mountain Ecosystems, 2 rue de la Papeterie, BP 76, F-38402 Saint-Martin-d'Hères, France.
authors.forename: Thomas
authors.initials: T
authors.lastname: Spiegelberger
authors.affiliation: Laboratoire d'Ecologie Alpine, CNRS UMR 5553, Université de Savoie, 73376 Le Bourget du Lac, France.
authors.forename: Christiane
authors.initials: C
authors.lastname: Gallet
authors.affiliation: Irstea, EMGR, Research Unit Mountain Ecosystems, 2 rue de la Papeterie, BP 76, F-38402 Saint-Martin-d'Hères, France.
authors.forename: Marine
authors.initials: M
authors.lastname: Pacé
authors.affiliation: Irstea, EMGR, Research Unit Mountain Ecosystems, 2 rue de la Papeterie, BP 76, F-38402 Saint-Martin-d'Hères, France.
authors.forename: Marika
authors.initials: M
authors.lastname: Imbert
authors.affiliation: Montpellier SupAgro, Centre d'Ecologie Fonctionnelle et Evolutive (UMR 5175), 1919 Route de Mende, 34293 Montpellier Cedex 5, France.
authors.forename: Marie-Laure
authors.initials: ML
authors.lastname: Navas
mesh_terms: D064089:Allelopathy; D052918:Environmental Restoration and Remediation / Q000379:methods*; D045468:Fallopia japonica / Q000502:physiology*; D059808:Polyphenols / Q000633:toxicity*; D032107:Populus / Q000187:drug effects / Q000254:growth & development*; D032108:Salix / Q000187:drug effects / Q000254:growth & development*; D013045:Species Specificity
chemical_list: D059808:Polyphenols
keywords: Allelopathy; Fallopia japonica; Invasion; Novel weapon hypothesis; Populus; Riverbank bioengineering; Salix