Effect of different tissue biochar amendments on As and Pb stabilization and phytoavailability in a contaminated mine technosol
2020
Lebrun, Manhattan | Miard, Florie | Hattab-Hambli, Nour | Scippa, Gabriella S. | Bourgerie, Sylvain | Morabito, Domenico, D. | Laboratoire de Biologie des Ligneux et des Grandes Cultures (LBLGC) ; Université d'Orléans (UO)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Università degli Studi del Molise = University of Molise (UNIMOL)
International audience
Show more [+] Less [-]English. Phytomanagement of metal(loid) contaminated soils is an important study of research nowadays. However, such process often requires the application of amendments, i.e. biochar, to improve soil condition and thus permit plant establishment and growth. However, biochar properties and effects on the soil and plants depend on several parameters, for example: feedstock type, particle size, pyrolysis conditions, and application rate. The aim of this study was to assess which tissue from the oak trunk (bark, sapwood, heartwood) was responsible for the positive effects observed in previous studies on biochars derived from wood. A mesocosm experiment was thus set up using a former mine soil, amended or not, using 2% biochars produced from three oak tissues (bark, sapwood, heartwood) and with three particle sizes (0.2–0.4 mm, 0.5–1 mm, 1–2.5 mm). Phaseolus vulgaris plants were used as indicators of toxicity, and were grown for 14 days. Results of soil pore water (SPW) physico-chemical parameters, and plant growth and metal(loid) (As and Pb) accumulation showed a highly significant feedstock effect but no particle size effect. Among the three feedstocks, bark biochars induced greater improvements in the different SPW parameters whereas it was the only tissue increasing plant growth. Therefore, bark seems to be the best trunk part to produce a biochar that will immobilize mainly Pb compared to As.
Show more [+] Less [-]AGROVOC Keywords
Bibliographic information
This bibliographic record has been provided by Institut national de la recherche agronomique