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| Teixeira,Renato Alves; Fernandes,Antonio Rodrigues; Ferreira,José Roberto; Vasconcelos,Steel Silva; Braz,Anderson Martins de Souza. |
| ABSTRACT Discovered in 1980 and unleashed an utter gold rush of the modern era, Serra Pelada was the largest open-air mine in Brazil. About 80,000 gold prospectors worked there until 1984, when the gold pits were flooded. The environmental impact caused by mining inflicted irreversible damage to the ecosystem, with the formation of a large lake and piles of waste rock and sterile overburden, still evident 28 years after the mine was closed. This study aimed to evaluate the available and pseudo total contents of potentially toxic elements (PTEs), the contamination and pollution levels, and to understand how the biological soil factors are related to the chemical properties of the soil and the available PTE contents in the Serra Pelada - Amazônia, Brazil.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Artisanal mining; Metabolic quotient; Microbial carbon. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100508 |
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| Teixeira,Renato Alves; Soares,Tatiana Gazel; Fernandes,Antonio Rodrigues; Braz,Anderson Martins de Souza. |
| Studies to select one or more species of coverage plants adapted to Amazonian soil and climate conditions of the Amazon are a promising strategy for the improvement of environmental quality, establishing no-till agricultural systems, and thereby reducing the impacts of monoculture farming. The aim of this study was to assess the persistence time, half-life time, macronutrient content and accumulation, and C:N ratio of straw coverage in a Ultisol in northeastern Pará. Experimental design was randomized blocks with five treatments and five replicates. Plants were harvested after 105 days, growth and biomass production was quantified. After 84 days, soil coverage was 97, 85, 52, 50, and 15% for signalgrass (Brachiaria brizantha) (syn. Urochloa), dense... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Half-life; Persistence of plant biomass; Recycling nutrients; C / N ratio. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672014000400002 |
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| Lopes,Elessandra Laura Nogueira; Fernandes,Antonio Rodrigues; Teixeira,Renato Alves; Sousa,Edna Santos de; Ruivo,Maria de Lourdes Pinheiro. |
| AbstractSoil biological properties have a high potential for use in assessing the impacts of crop systems. The objective of this study is to evaluate the effects of cropping systems on the biological attributes of an oxisol in the Amazonian state of Pará. The treatments consisted of approximately 20-year-old secondary vegetation, recovered pasture, no-tillage systems (NT) maintained for 4 and 8 years after planting with corn (Zea mays L.) and soybean (Glycine max L.), and conventional tillage (CT) systems every 2 years after planting with rice (Oryza sativa L.) and soybean. The microbial biomass to nitrogen ratio was higher in the NT system (0.68 mg kg–1), and the NT system had greater microbial NT8. Thus, the contributions of organic matter from straw... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Carbon stock; No-tillage; Oryza sativa; Glycine max; Zea mays; Amazon region. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052015000400428 |
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