Soil microbial respiration and PICT responses to an industrial and historic lead pollution: a field study

TitleSoil microbial respiration and PICT responses to an industrial and historic lead pollution: a field study
Publication TypeJournal Article
Year of Publication2016
AuthorsBerard A, Capowiez L, Mombo S, Schreck E, Dumat C, Deola F, Capowiez Y
JournalEnvironmental Science and Pollution Research
Volume23
Pagination4271-4281
Date PublishedMar
Type of ArticleArticle
ISBN Number0944-1344
Accession NumberWOS:000371156100027
KeywordsADAPTATION, bacterial communities, contamination, forest, heavy metals, heavy-metals, INDUCED COMMUNITY TOLERANCE, Lead, MECHANISMS, MICROBIAL, Microbial ecotoxicology, microresp (tm), microresp(tm) method, physiological profiles, physiological traits, pollution-induced community tolerance, RISK-ASSESSMENT, Soilmicrobial communities, substrate-induced respiration
Abstract

We performed a field investigation to study the long-term impacts of Pb soil contamination on soil microbial communities and their catabolic structure in the context of an industrial site consisting of a plot of land surrounding a secondary lead smelter. Microbial biomass, catabolic profiles, and ecotoxicological responses (PICT) were monitored on soils sampled at selected locations along 110-m transects established on the site. We confirmed the high toxicity of Pb on respirations and microbial and fungal biomasses by measuring positive correlations with distance from the wall factory and negative correlation with total Pb concentrations. Pb contamination also induced changes in microbial and fungal catabolic structure (from carbohydrates to amino acids through carboxylic malic acid). Moreover, PICT measurement allowed to establish causal linkages between lead and its effect on biological communities taking into account the contamination history of the ecosystem at community level. The positive correlation between qCO(2) (based on respiration and substrate use) and PICT suggested that the Pb stress-induced acquisition of tolerance came at a greater energy cost for microbial communities in order to cope with the toxicity of the metal. In this industrial context of long-term polymetallic contamination dominated by Pb in a field experiment, we confirmed impacts of this metal on soil functioning through microbial communities, as previously observed for earthworm communities.

Alternate JournalEnviron. Sci. Pollut. Res.