naa a22 4500 510751180 CHVBK 20180411083105.0 cr unu---uuuuu 180411e20130401xx s 000 0 eng 10.1007/s11270-013-1515-3 doi (NATIONALLICENCE)springer-10.1007/s11270-013-1515-3 Impacts of Land Uses on Mercury Retention in Long-Time Cultivated Soils, Brazilian Amazon [Elektronische Daten] [Irina Comte, Marc Lucotte, Robert Davidson, Claúdio Reis de Carvalho, Francisco de Assis Oliveira, Guillaume Rousseau] 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 49.48ngg−1, 0-5cm 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). Springer Science+Business Media Dordrecht, 2013 Amazon nationallicence Ancient colonization nationallicence Chop-and-mulch nationallicence Mercury nationallicence Slash-and-burn nationallicence Soil nationallicence Comte Irina Institute of Environmental Sciences and GEOTOP, Université du Québec à Montréal, C.P. 8888, succ. Centre-Ville, H3C 3P8, Montreal, Quebec, Canada aut Lucotte Marc Institute of Environmental Sciences and GEOTOP, Université du Québec à Montréal, C.P. 8888, succ. Centre-Ville, H3C 3P8, Montreal, Quebec, Canada aut Davidson Robert Biodôme de Montréal, 4777, avenue Pierre-De Coubertin, H1V 1B3, Montreal, Quebec, Canada aut Reis de Carvalho Claúdio EMBRAPA Eastern Amazonia, Dr. Eneas Pinheiro Lane, 66095-100, Belem, PA, Brazil aut de Assis Oliveira Francisco University of Agricultural Sciences (UFRA), 2501 President Tancredo Neves Avenue, 66.077-530, Belem, PA, Brazil aut Rousseau Guillaume Postgraduate Program in Agroecology, State University of Maranhão (UEMA), P O Box 3004, 65000-000, São Luis, MA, Brazil aut Water, Air, & Soil Pollution Springer Netherlands 224/4(2013-04-01), 1-14 0049-6979 224:4<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1515-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1515-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Comte Irina Institute of Environmental Sciences and GEOTOP, Université du Québec à Montréal, C.P. 8888, succ. Centre-Ville, H3C 3P8, Montreal, Quebec, Canada aut NATIONALLICENCE 700 1- Lucotte Marc Institute of Environmental Sciences and GEOTOP, Université du Québec à Montréal, C.P. 8888, succ. Centre-Ville, H3C 3P8, Montreal, Quebec, Canada aut NATIONALLICENCE 700 1- Davidson Robert Biodôme de Montréal, 4777, avenue Pierre-De Coubertin, H1V 1B3, Montreal, Quebec, Canada aut NATIONALLICENCE 700 1- Reis de Carvalho Claúdio EMBRAPA Eastern Amazonia, Dr. Eneas Pinheiro Lane, 66095-100, Belem, PA, Brazil aut NATIONALLICENCE 700 1- de Assis Oliveira Francisco University of Agricultural Sciences (UFRA), 2501 President Tancredo Neves Avenue, 66.077-530, Belem, PA, Brazil aut NATIONALLICENCE 700 1- Rousseau Guillaume Postgraduate Program in Agroecology, State University of Maranhão (UEMA), P O Box 3004, 65000-000, São Luis, MA, Brazil aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/4(2013-04-01), 1-14 0049-6979 224:4<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer