Data/hora: 12/06/2024 07:39:56

Biblioteca(s): | Embrapa Amazônia Oriental.
Data corrente: | 14/08/2017
Data da última atualização: | 22/12/2021
Autoria: | COMTE, I.; LUCOTTE, M.; DAVIDSON, R.; CARVALHO, C. J. R. de; OLIVEIRA, F. de A.; ROUSSEAU, G. X.
Afiliação: | Irina Comte, Université du Québec à Montréal; Marc Lucotte, Université du Québec à Montréal; Robert Davidson, Biodôme de Montréal / Université du Québec à Montréal; CLAUDIO JOSE REIS DE CARVALHO, CPATU; Francisco de Assis Oliveira, UFRA; Guillaume X. Rousseau, PÓS-GRADUANDO UEMA.
Título: | Impacts of land uses on mercury retention in long-time cultivated soils, Brazilian Amazon.
Ano de publicação: | 2013
Fonte/Imprenta: | Water, Air, & Soil Pollution, v. 224, n. 4, April 2013.
DOI: | 10.1007/s11270-013-1515-3
Idioma: | Inglês
Conteúdo: | Many studies have shown the relationship between fire clearing and mercury contamination of aquatic ecosystems in the Brazilian Amazon. This study aimed at quantifying mercury content in long-time cultivated soils and at assessing the potential of a fire-free alternative clearing technique on mercury retention for long-time cultivated soils compared to traditional slash-and-burn. This case study included five land uses: one crop plot and one pasture plot cleared using slash-and-burn, one crop plot and one pasture plot cleared using chop-and-mulch, and one 40-year-old forest as a control. Low mercury concentrations were recorded in the surface horizon (24.83 to 49.48 ng g&#8722;1, 0?5 cm depth). The long-time cultivation (repeated burnings) of these soils triggered large mercury losses in the surface horizon, highlighted by high enrichment factors from surface to deeper horizons. The predominant effect of repeated burnings before the experimental implementation did not let us to distinguish a positive effect of the chop-and-mulch clearing method on soil mercury retention for crops and pastures. Moreover, some processes related to the presence of the mulch may favor mercury retention (Hg volatilization decrease, cationic sites increase), while others may contribute to mercury losses (cationic competition and dislocation, mobilization by the dissolved organic matter).
Palavras-Chave: | Corte e queima.
Thesagro: | Mercúrio; Solo.
Thesaurus Nal: | Amazonia.
Categoria do assunto: | P Recursos Naturais, Ciências Ambientais e da Terra
Registro original: | Embrapa Amazônia Oriental (CPATU)
Exemplares: | CPATU - (53981-1) - UPC - AP - DD -  -  -  - DIS