Methylmercury content in soil and litter from the Amazonian rainforest and its potential fate during forest fires - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Frontiers in Environmental Chemistry Année : 2023

Methylmercury content in soil and litter from the Amazonian rainforest and its potential fate during forest fires

Résumé

Methylmercury in soils and vegetation from the Amazonian rainforest is still poorly studied. Hence, the aim of this work was to determine the total mercury [THg] and methylmercury [MeHg] concentrations in litter and surface soil, MeHg deposition via litterfall, and the MeHg fate during a forest fire in the Amazonian rainforest. Sampling of litter, soil (0-1, 1-2, and 2-5 cm), and ash was carried out before (BB) and after (AB) a prescribed forest fire. The results showed a low [THg] (34 ± 8 ng g-1) and [MeHg] (0.16 ± 0.03 ng g-1) value in litter, with a correspondingly low estimate of the MeHg litterfall flux (0.13 ± 0.03 μgm-2 yr-1) which has been probably underestimated due to potential losses during the field experiment. In ashes, [THg] and [MeHg] values were 23 ± 8 ng g-1 and 0.11 ± 0.04 ng g-1 , respectively. Although a significant part of Hg contained in the biomass was lost during the fire, the [MeHg]/[THg] ratio was not affected by it and was the same in litterfall and ash (~0.5%). In soil, the average [THg] BB value was 149 ± 12 ng g-1 in the three layers and [MeHg] was between 0.8 and 1.0 ng g-1. The forest fire only affected the superficial soil, with a significant decrease of [THg] and [MeHg] in the 0-1 cm layer. Similarly, the decrease of the [MeHg]/[THg] ratio in the surface soil layer suggested that MeHg was more readily emitted or degraded than the other Hg species present.
Fichier principal
Vignette du fichier
2023_Fostieretal_FrontEnvChem_MeHgAmazonsoillitterfire_fenvc-04-1242915.pdf (1.44 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-04311486 , version 1 (28-11-2023)

Identifiants

Citer

Anne Helene Fostier, David Amouroux, Emmanuel Tessier, José Lucas Martins Viana, Larissa Richter. Methylmercury content in soil and litter from the Amazonian rainforest and its potential fate during forest fires. Frontiers in Environmental Chemistry, 2023, 4, pp.1242915. ⟨10.3389/fenvc.2023.1242915⟩. ⟨hal-04311486⟩
16 Consultations
10 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More