Use este identificador para citar ou linkar para este item: http://repositorio.ufla.br/jspui/handle/1/40037
Título: Critical mercury concentration in tropical soils: Impact on plants and soil biological attributes
Palavras-chave: Avena sativa
Phaseolus vulgaris
Trace elements
Phytotoxicity
Elementos traço
Fitotoxicidade
Data do documento: 20-Mai-2019
Editor: Elsevier
Citação: LIMA, F. R. D. et al. Critical mercury concentration in tropical soils: Impact on plants and soil biological atributes. Science of The Total Environment, [S. l.], v. 666, p. 472-479, 20 May 2019.
Resumo: Mercury is a toxic element that becomes a problem when present at high concentrations in soils. Mercury toxicity in soils varies depending on chemical species, concentration, exposure routes, and organism vulnerability. There is little information regarding the toxicity of Hg in tropical soils, especially for establishing safe levels of this pollutant. The purpose of this study was to investigate Hg concentrations in two tropical soils and their effect on oats and common beans, as well as on soil biological attributes. The experiment was carried out in a greenhouse, following ISO 11.269-2 and OECD-208 guidelines. Oat and common bean were cultivated in a Typic Hapludox (TyHpx) and Rhodic Acrudox (RhAcx) contaminated with HgCl2 at the following concentrations: 0, 2.5, 5.0, 10.0, 20.0, 40.0, and 80.0 mg of Hg kg−1 of dry soil. The biological variables analyzed were seedling emergence, vegetative growth, chlorophyll content (SPAD index), gas exchange (photosynthetic rate, internal CO2 concentration, transpiration rate, and stomatal conductance), and Hg concentration and accumulation in shoot dry matter. Microbial biomass carbon, soil basal respiration, and metabolic quotient (qCO2) were also analyzed. Due to the sorptive characteristics of TyHpx, it had higher Hg concentrations than RhAcx. Mercury showed toxic effects on both oat and common bean species. However, common bean was affected only at concentrations higher than 20 mg kg−1. The microbial community showed high sensitivity to soil Hg concentrations, but external factors, such as the plant species cultivated, influenced the sensitivity of the community. The microbiota was most sensitive in pots with common bean, and this effect was more pronounced at low clay and low organic matter contents (TyHpx). In this study, the concentration of 0.36 mg kg−1 was critical for Hg in these soils, based on its deleterious effects on oat and common bean and on biological soil attributes.
URI: https://www.sciencedirect.com/science/article/pii/S0048969719307041#!
http://repositorio.ufla.br/jspui/handle/1/40037
Aparece nas coleções:DCS - Artigos publicados em periódicos

Arquivos associados a este item:
Não existem arquivos associados a este item.


Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.