Lilian Marchand1, Céline Pelosi2, María Reyes González-Centeno3, Anne Maillard4, Alain Ourry4, William Galland5, Pierre-Louis Teissedre3, Jean-Jacques Bessoule6, Sébastien Mongrand6, Annette Morvan-Bertrand4, Qinzhong Zhang7, Claire Grosbellet8, Valérie Bert9, Nadège Oustrière1, Michel Mench1, Sophie Brunel-Muguet4. 1. INRA, UMR 1202 BIOGECO, 69 Route d'Arcachon, FR-33612, Cestas cedex, France; Université de Bordeaux, UMR 1202 BIOGECO, Bât B2, Allée G. St-Hilaire, CS50023, FR-33615, Pessac cedex, France. 2. INRA, UMR 1402 ECOSYS, F-78026, Versailles cedex, France; AgroParisTech, UMR 1402 ECOSYS, F-78850, Thiverval-Grignon, France. 3. Université de Bordeaux, Institut des Sciences de la Vigne et du Vin, Unité de recherche Oenologie, EA 4577, USC 1366 INRA, IPB, 210, chemin de Leysotte, CS 50008, 33882, Villenave d'Ornon cedex, France. 4. INRA, UMR 950 Ecophysiologie Végétale, Agronomie et nutritions N, C, S, Esplanade de la Paix, CS14032, 14032, Caen Cedex 5, France; Normandie Université, 14032, Caen, France; UNICAEN, UMR 950 Ecophysiologie Végétale, Agronomie et nutritions N, C, S, Esplanade de la Paix, CS14032, 14032, Caen Cedex 5, France. 5. Université de Bordeaux, UMR 1202 BIOGECO, Bât B2, Allée G. St-Hilaire, CS50023, FR-33615, Pessac cedex, France. 6. INRA, UMR 5200 CNRS-Université Bordeaux, Laboratoire de Biogenèse Membranaire, 71, avenue Edouard Bourlaux, 33883, Villenave-d'Ornon Cedex, France. 7. Key Laboratory of Agricultural Environment, Ministry of Agriculture, Sino-Australian Joint Laboratory for Sustainable Agro-Ecosystems, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, 100081, China. 8. Florentaise, La grande Gâcherie, 44850, Saint Mars du Désert, France. 9. INERIS, Technologies and Sustainable and Clean Processes, Parc Technologique Alata, BP2, 60550, Verneuil en Halatte, France.
Abstract
BACKGROUND AND AIMS: Rapeseed (Brassica napus L.) is a Cd/Zn-accumulator whereas soil conditioners such as biochars may immobilize trace elements. These potentially complementary soil remediation options were trialed, singly and in combination, in a pot experiment with a metal(loid)-contaminated technosol. METHODS: The technosol [total content in mg kg(-1) Zn 6089, Cd 9.4, Cu 110, and Pb 956] was either amended (2% w/w) or not with a poultry manure-derived biochar. Rapeseed was cultivated for both soil treatments during 24 weeks up to harvest under controlled conditions. RESULTS: Biochar incorporation into the technosol promoted the As, Cd, Cu, Mo, Ni, Pb and Zn solubility. It decreased foliar B, Cu and Mo concentrations, and Mo concentration in stems, pericarps and seeds. But, it did not impact neither the biomass of aerial rapeseed parts (except a decrease for seeds), nor their C (except a decrease for stems), seed fatty acid, seed starch and soluble sugar contents, and antioxidant capacity in both leaves and seeds. Biochar amendment increased the phytoextraction by aerial plant parts for K, P, and S, reduced it for N, Ca, B, Mo, Ni and Se, whereas it remained steady for Mg, Zn, Fe, Mn, Cu, Cd and Co. CONCLUSIONS: The biochar incorporation into this technosol did not promote Cd, Cu and Zn phytoextraction by rapeseed and its potential oilseed production, but increased the solubility of several metal(loid)s. Here Zn and Cd concentrations in the soil pore water were decreased by rapeseed, showing the feasibility to strip available soil Zn and Cd in combination with seed production.
BACKGROUND AND AIMS: Rapeseed (Brassica napus L.) is a Cd/Zn-accumulator whereas soil conditioners such as biochars may immobilize trace elements. These potentially complementary soil remediation options were trialed, singly and in combination, in a pot experiment with a metal(loid)-contaminated technosol. METHODS: The technosol [total content in mg kg(-1) Zn 6089, Cd 9.4, Cu 110, and Pb 956] was either amended (2% w/w) or not with a poultry manure-derived biochar. Rapeseed was cultivated for both soil treatments during 24 weeks up to harvest under controlled conditions. RESULTS: Biochar incorporation into the technosol promoted the As, Cd, Cu, Mo, Ni, Pb and Zn solubility. It decreased foliar B, Cu and Mo concentrations, and Mo concentration in stems, pericarps and seeds. But, it did not impact neither the biomass of aerial rapeseed parts (except a decrease for seeds), nor their C (except a decrease for stems), seed fatty acid, seed starch and soluble sugar contents, and antioxidant capacity in both leaves and seeds. Biochar amendment increased the phytoextraction by aerial plant parts for K, P, and S, reduced it for N, Ca, B, Mo, Ni and Se, whereas it remained steady for Mg, Zn, Fe, Mn, Cu, Cd and Co. CONCLUSIONS: The biochar incorporation into this technosol did not promote Cd, Cu and Zn phytoextraction by rapeseed and its potential oilseed production, but increased the solubility of several metal(loid)s. Here Zn and Cd concentrations in the soil pore water were decreased by rapeseed, showing the feasibility to strip available soil Zn and Cd in combination with seed production.