The objective was to investigate the context, approach and research topics present in the papers that analysed trace elements in beef cattle to identify gaps and scientific perspectives for the sustainable management of trace elements in livestock. The main research groups came from the United States, Spain, Japan, Brazil, India and Slovakia, which represented 31% of the papers produced. Only 37% of studies addressed aspects that integrated animal, environmental and human health. The reviewed papers concerned 56 elements and 15 bovine tissues (Cu, Zn, Pb, liver, muscle and kidney highlighted). The main gaps were (1) lack of research in developing countries, (2) the need to understand the impact of different environmental issues and their relationship to the conditions in which animals are raised, and (3) the need to understand the role of many trace elements in animal nutrition and their relationship to environmental and human health. Finally, we highlight possible ways to expand knowledge and provide innovations for broad emerging issues, primarily through expanding collaborative research networks. In this context, we suggest the adoption of the One Health approach for planning further research on trace elements in livestock. Moreover, the One Health approach should also be considered for managers and politicians for a sustainable environmental care and food safety.

Campos de murundus são áreas úmidas caracterizadas por apresentar um relevo plano intermeados por montículos, denominados murundus. O conhecimento dos teores de elementos-traço nesses ambientes é importante para subsidiar uma gestão sustentável em áreas sujeitas à intervenção antrópica de modo conciliar a demanda produtiva e a conservação ambiental. O objetivo desse trabalho foi determinar os teores e propor valores de referência de qualidade (VRQs) de elementos-traço (Zn, Ni, Cu, Cr, Pb, As, Cd e Se), Fe e Mn no solo dos campos de murundus na região sudoeste de Mato Grosso, Brasil. Para isso, foram coletadas amostras de solo nas profundidades de 0 a 20 e 20 a 40 cm, nos ambientes “murundu” e “plano”, os quais representam os murundus propriamente ditos e a área em seu entorno, respectivamente. A proposição de VRQs foi realizada de acordo com a resolução Conama 420/2009. Os VRQs propostos para esses ambientes foram: Zn 7,8; Ni 6,0; Cu 9,2; Cr 21,0; Pb 10,8; As 1,6; Cd <0,03, Se <0,31 e Mn 16,5 mg kg-1 e Fe 4,9 g kg-1. Os teores observados refletem a pobreza do material de origem dos solos nesses elementos, bem como a ausência de contaminação.

Teores de As, Cd, Pb, Cr e Ni e atributos de fertilidade de Argissolo Amarelo distrófico usado como lixão no município de Cáceres, estado de Mato Grosso

The parameter for delimiting Areas of Permanent Preservation (APPs) in the 2012 Forest Code is the edge of the regular stream bed, not its highest level. The objective of this study is to evaluate the loss of protected areas, framed the category of water APPs in the 2012 Forest Code, in the Cabaçal River. By means of spatial technologies, maps of vegetation cover and land use from 2012 and 2018 were prepared. The change in the Forest Code in 2012 caused the loss of 90% of the area previously protected by the 1965 Code, corresponding to the major waterbed of the Cabaçal River, especially in the lower course, located in the Pantanal plain of Mato Grosso. It was concluded that the vegetation cover in the Areas of Permanent Preservation was suppressed so that urban and agricultural uses could be implanted, characterizing them as conflict areas due to the flexibilization of the environmental legislation.

The objectives of this study were to evaluate the effect of the no-tillage system on soil bulk density, soil organic carbon, and carbon stocks in Plinthic subgroups and Oxisols, located in Pontes and Lacerda, State of Mato Grosso, Brazil. The treatments were native vegetation and no-tillage systems established for 3, 8, 10, and 12 years. To analyse soil organic carbon, soils were sampled in each area, with three repetitions, at layers of 0-0.05; 0.05-0.10; 0.10-0.20; 0.20-0.40; 0.40-0.60; 0.60-1.00; 1.00-1.50 and 1.50-2.00 m. For soil bulk density, undisturbed samples were collected at layers of 0-0.20 and 0.20-0.40 m. Compared with areas of native vegetation, soil bulk density values after 12 years increased by 25% in Oxisols and 30% in the Plinthic subgroups. In Oxisols and Plinthic subgroups, respectively, organic carbon concentration was, on average, 20.57, 25.04 g kg-1 under native vegetation; 16.82, 16.59 g kg-1 after 3 years of no-tillage; 13.31, 4.96 g kg-1 after 8 years; 16.52, 14.39 g kg-1 after 10 years; and 17.97, 18.53 g kg-1 after 12 years. In both soils, the no-tillage system contributed to an increase in carbon stocks over the years, but not at depth, being generally limited to the top 0.20 m of the soils. Compared to native vegetation, after 12 years of no-tillage, carbon stocks decreased at a rate of 0.075 Mg ha-1 year-1 in the Plinthic subgroups and increased by 2.3 Mg ha-1 year-1 in Oxisols.

Resumo O parâmetro para delimitação das Áreas de Preservação Permanentes (APPs) do Código Florestal de 2012 é a borda da calha do leito regular do curso d’água e não o seu nível mais alto. O objetivo deste estudo é avaliar a perda de áreas protegidas, enquadradas na categoria das APPs hídricas, em virtude do Código Florestal de 2012, no rio Cabaçal, MT Por meio das tecnologias espaciais, foram elaborados mapas de cobertura vegetal e uso da terra de 2012 e 2018. A mudança do Código Florestal em 2012 ocasionou perda de 90% de área anteriormente protegida pelo de 1965, correspondente ao leito maior hidrológico do rio Cabaçal, especialmente no baixo curso, situado na planície do Pantanal mato-grossense. Concluiu-se que a cobertura vegetal nas Áreas de Preservação Permanente foi suprimida para que os usos urbano e agropecuário fossem implantados, caracterizando-as como de conflitos devido à flexibilização da legislação ambiental.