AGROBIOLOGIA
Volume 9, Numéro 1, Pages 1428-1434

Phytostabilization Of Technosols Contaminated With Arsenic And Lead

Authors : Saladin Gaëlle .

Abstract

Seeds of Douglas fir were sown and cultivated in greenhouse for 3 months on two Technosols from former mines located in central France (La Petite Faye LPF and Pontgibaud PGB) and contaminated with As and Pb. Plantlets grown on PGB soil had a high concentration of Pb in their roots, underwent an oxidative stress and their total biomass was reduced by a factor two while plantlets grown on LPF were less altered but accumulated As in their aerial organs. In order to improve growth and reduce metal (loid) concentration in plantlets, Technosols were amended with composted sewage sludge (CSS). The results showed that CSS significantly stimulated growth of plantlets grown on PGB soil with a biomass close to control plantlets. Moreover, plantlets grown of LPF exhibited a lower As concentration in their aboveground organs, indicating that CSS is an efficient amendment to phytostabilize the contaminated soils. We then cultivated herbaceous species (common vetch, white lupin, buckwheat) for 3 weeks on PGB soil. The aim is to increase the future vegetation cover with a co-culture of trees and herbaceous. Without amendment, the growth of common vetch and buckwheat was strongly reduced but not for white lupin. All herbaceous species exhibited low As concentration in whole organs but high Pb concentration in roots, indicating that CSS should be added as for Douglas fir for a better phytostabilization.

Keywords

Fagopyrum esculentum, Lupinus albus, phytoremédiation, Pseudotsuga menziesii, Vicia sativa