title: Assessment of fly ash-aided phytostabilisation of highly contaminated soils after an 8-year field trial Part 2. Influence on plants.
abstract: Aided phytostabilisation is a cost-efficient technique to manage metal-contaminated areas, particularly in the presence of extensive pollution. Plant establishment and survival in highly metal-contaminated soils are crucial for phytostabilisation success, as metal toxicity for plants is widely reported. A relevant phytostabilisation solution must limit metal transfer through the food chain. Therefore, this study aimed at evaluating the long-term efficiency of aided phytostabilisation on former agricultural soils highly contaminated by cadmium, lead, and zinc. The influence of afforestation and fly ash amendments on reducing metal phytoavailability was investigated as were their effects on plant development. Before being planted with a tree mix, the site was divided into three plots: a reference plot with no amendment, a plot amended with silico-aluminous fly ash and one with sulfo-calcic fly ash. Unlike Salix alba and Quercus robur, Alnus glutinosa, Acer pseudoplatanus and Robinia pseudoacacia grew well on the site and accumulated, overall, quite low concentrations of metals in their leaves and young twigs. This suggests that these three species have an excluder phenotype for Cd, Zn and Pb. After 8 years, metal availability to A. glutinosa, A. pseudoplatanus and R. pseudoacacia, and translocation to their above-ground parts, strongly decreased in fly ash-amended soils. Such decreases fit well together with the depletion of CaCl(2)-extractable metals in amended soils. Although both fly ashes were effective to decrease Cd, Pb and Zn concentrations in above-ground parts of trees, the sulfo-calcic ash was more efficient.
authors.affiliation: Université Lille Nord de France, Lille, France.
authors.forename: Bertrand
authors.initials: B
authors.lastname: Pourrut
authors.forename: Alena
authors.initials: A
authors.lastname: Lopareva-Pohu
authors.forename: Christelle
authors.initials: C
authors.lastname: Pruvot
authors.forename: Guillaume
authors.initials: G
authors.lastname: Garçon
authors.forename: Anthony
authors.initials: A
authors.lastname: Verdin
authors.forename: Christophe
authors.initials: C
authors.lastname: Waterlot
authors.forename: Géraldine
authors.initials: G
authors.lastname: Bidar
authors.forename: Pirouz
authors.initials: P
authors.lastname: Shirali
authors.forename: Francis
authors.initials: F
authors.lastname: Douay
mesh_terms: D001673:Biodegradation, Environmental; D002104:Cadmium / Q000032:analysis / Q000378:metabolism; D002244:Carbon / Q000737:chemistry / Q000378:metabolism*; D060729:Coal Ash / Q000737:chemistry / Q000378:metabolism; D052918:Environmental Restoration and Remediation / Q000379:methods*; D005602:France; D007700:Kinetics; D007854:Lead / Q000032:analysis / Q000378:metabolism; D019216:Metals, Heavy / Q000032:analysis / Q000378:metabolism*; D052638:Particulate Matter / Q000032:analysis / Q000378:metabolism*; D018515:Plant Leaves / Q000737:chemistry / Q000378:metabolism; D018521:Plant Physiological Phenomena; D018547:Plant Stems / Q000737:chemistry / Q000378:metabolism; D010944:Plants / Q000187:drug effects*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis / Q000378:metabolism*; D014131:Trace Elements / Q000032:analysis / Q000378:metabolism; D014197:Trees / Q000737:chemistry / Q000378:metabolism; D015032:Zinc / Q000032:analysis / Q000378:metabolism
chemical_list: D060729:Coal Ash; D019216:Metals, Heavy; D052638:Particulate Matter; D012987:Soil; D012989:Soil Pollutants; D014131:Trace Elements; D002104:Cadmium; D007854:Lead; D002244:Carbon; D015032:Zinc