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Registro Completo |
Biblioteca(s): |
Embrapa Amapá; Embrapa Amazônia Ocidental; Embrapa Amazônia Oriental; Embrapa Rondônia; Embrapa Roraima. |
Data corrente: |
27/06/2019 |
Data da última atualização: |
11/11/2019 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
SILVA JÚNIOR, E. C. da; MARTINS, G. C.; WADT, L. H. de O.; SILVA, K. E. da; LIMA, R. M. B. de; BATISTA, K. D.; GUEDES, M. C.; OLIVEIRA JUNIOR, R. C. de; REIS, A. R.; LOPES, G.; MENEZES, M. D. de; BROADLEY, M. R.; YOUNG, S. D.; GUILHERME, L. R. G. |
Afiliação: |
LUCIA HELENA DE OLIVEIRA WADT, CPAF-RO; KATIA EMIDIO DA SILVA, CPAA; ROBERVAL MONTEIRO BEZERRA DE LIMA, CPAA; KARINE DIAS BATISTA, CPAF-RR; MARCELINO CARNEIRO GUEDES, CPAF-AP; RAIMUNDO COSME DE OLIVEIRA JUNIOR, CPATU. |
Título: |
Natural variation of arsenic fractions in soils of the Brazilian Amazon. |
Ano de publicação: |
2019 |
Fonte/Imprenta: |
Science of the Total Environment,v. 687, p. 1219-1231, 2019. |
Idioma: |
Inglês Português |
Conteúdo: |
Arsenic (As) in native soils of the Amazon rainforest is a concern due to its likely origin from the Andean rivers, which transport loads of sediments containing substantial amounts of trace elements coming from the cordilleras. Yet, unveiling soil As baseline concentrations in the Amazon basin is still a need because most studies in Brazil have been performed in areas with predominantly high concentrations and cannot express a real baseline value for the region. In this study, 414 soil samples (0?20, 20?40 and 40?60 cm layers) were collected from different sites throughout the Amazon basin - including native Amazon rainforest and minimally disturbed areas - and used to determine total and extractable (soluble + available) As concentrations along with relevant soil physicochemical properties. Descriptive statistics of the data was performed and Pearson correlation supported by a Principal Component Analysis (PCA) provided an improved understanding ofwhere and howAs concentrations are influenced by soil attributes. Total As concentration ranged from0.98 to 41.71 mgkg?1 with values usually increasing from the topsoil (0?20 cm) to the deepest layer (40?60 cm) in all sites studied. Considering the proportional contribution given by each fraction (soluble and available) on extractable As concentration, it is noticeable that KH2PO4-extractable As represents themost important fraction,with N70% of the As extracted on average in all the sites studied. Still, the extractable fractions (soluble+available) correspond to ~0.24% of the total As, on average. Total, available, and soluble As fractions were strongly and positively correlated with soil Al3+.
The PCA indicated that soil pH in combination with CEC might be the key factors controlling soil As concentrations and the occurrence of each arsenic fraction in the soil layers. MenosArsenic (As) in native soils of the Amazon rainforest is a concern due to its likely origin from the Andean rivers, which transport loads of sediments containing substantial amounts of trace elements coming from the cordilleras. Yet, unveiling soil As baseline concentrations in the Amazon basin is still a need because most studies in Brazil have been performed in areas with predominantly high concentrations and cannot express a real baseline value for the region. In this study, 414 soil samples (0?20, 20?40 and 40?60 cm layers) were collected from different sites throughout the Amazon basin - including native Amazon rainforest and minimally disturbed areas - and used to determine total and extractable (soluble + available) As concentrations along with relevant soil physicochemical properties. Descriptive statistics of the data was performed and Pearson correlation supported by a Principal Component Analysis (PCA) provided an improved understanding ofwhere and howAs concentrations are influenced by soil attributes. Total As concentration ranged from0.98 to 41.71 mgkg?1 with values usually increasing from the topsoil (0?20 cm) to the deepest layer (40?60 cm) in all sites studied. Considering the proportional contribution given by each fraction (soluble and available) on extractable As concentration, it is noticeable that KH2PO4-extractable As represents themost important fraction,with N70% of the As extracted on average in all the sites studied. Still, the extractable fraction... Mostrar Tudo |
Palavras-Chave: |
Carcinogenic. |
Thesagro: |
Arsênico. |
Thesaurus Nal: |
Amazonia; Arsenic. |
Categoria do assunto: |
-- K Ciência Florestal e Produtos de Origem Vegetal |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/198874/1/arsenio-ediu-2019.pdf
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Marc: |
LEADER 02760naa a2200325 a 4500 001 2110118 005 2019-11-11 008 2019 bl uuuu u00u1 u #d 100 1 $aSILVA JÚNIOR, E. C. da 245 $aNatural variation of arsenic fractions in soils of the Brazilian Amazon.$h[electronic resource] 260 $c2019 520 $aArsenic (As) in native soils of the Amazon rainforest is a concern due to its likely origin from the Andean rivers, which transport loads of sediments containing substantial amounts of trace elements coming from the cordilleras. Yet, unveiling soil As baseline concentrations in the Amazon basin is still a need because most studies in Brazil have been performed in areas with predominantly high concentrations and cannot express a real baseline value for the region. In this study, 414 soil samples (0?20, 20?40 and 40?60 cm layers) were collected from different sites throughout the Amazon basin - including native Amazon rainforest and minimally disturbed areas - and used to determine total and extractable (soluble + available) As concentrations along with relevant soil physicochemical properties. Descriptive statistics of the data was performed and Pearson correlation supported by a Principal Component Analysis (PCA) provided an improved understanding ofwhere and howAs concentrations are influenced by soil attributes. Total As concentration ranged from0.98 to 41.71 mgkg?1 with values usually increasing from the topsoil (0?20 cm) to the deepest layer (40?60 cm) in all sites studied. Considering the proportional contribution given by each fraction (soluble and available) on extractable As concentration, it is noticeable that KH2PO4-extractable As represents themost important fraction,with N70% of the As extracted on average in all the sites studied. Still, the extractable fractions (soluble+available) correspond to ~0.24% of the total As, on average. Total, available, and soluble As fractions were strongly and positively correlated with soil Al3+. The PCA indicated that soil pH in combination with CEC might be the key factors controlling soil As concentrations and the occurrence of each arsenic fraction in the soil layers. 650 $aAmazonia 650 $aArsenic 650 $aArsênico 653 $aCarcinogenic 700 1 $aMARTINS, G. C. 700 1 $aWADT, L. H. de O. 700 1 $aSILVA, K. E. da 700 1 $aLIMA, R. M. B. de 700 1 $aBATISTA, K. D. 700 1 $aGUEDES, M. C. 700 1 $aOLIVEIRA JUNIOR, R. C. de 700 1 $aREIS, A. R. 700 1 $aLOPES, G. 700 1 $aMENEZES, M. D. de 700 1 $aBROADLEY, M. R. 700 1 $aYOUNG, S. D. 700 1 $aGUILHERME, L. R. G. 773 $tScience of the Total Environment,v. 687, p. 1219-1231, 2019.
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Embrapa Rondônia (CPAF-RO) |
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Biblioteca(s): |
Embrapa Trigo. |
Data corrente: |
12/01/2000 |
Data da última atualização: |
26/06/2015 |
Tipo da produção científica: |
Boletim de Pesquisa e Desenvolvimento |
Autoria: |
CUNHA, G. R. da; HAAS, J. C.; DALMAGO, G. A.; PASINATO, A. |
Afiliação: |
CNPT; CNPT. |
Título: |
Cartas de perda de rendimento potencial em soja no Rio Grande do Sul por deficiência hídrica. |
Ano de publicação: |
1999 |
Fonte/Imprenta: |
Passo Fundo: Embrapa Trigo, 1999. |
Páginas: |
52 p. |
Série: |
(Embrapa Trigo. Boletim de pesquisa, 1). |
ISSN: |
1516-3830 |
Idioma: |
Português |
Conteúdo: |
A variabilidade na distribuicao de chuvas, durante o periodo de primavera-verao, e a principal limitacao a expressao do potencial de rendimento da cultura da soja no sul do Brasil. Nesse contexto, o presente estudo apresenta uma serie de mapas de perda de potencial de rendimentos em soja, no Rio Grande do Sul, por deficiencia hidrica, considerando as interacoes entre local x epoca de semeadura x ciclo de cultivares ao nivel de 80% de probabilidade. Conclui-se que a disponibilidade hidrica limita a expressao do potencial de rendimento de graos na cultura de soja em escalas regionalmente diferenciadas e que ha um gradiente de perda de potencial de rendimento por deficiencia hidrica, com aumento de magnitude no sentido de nordeste para sudoeste. Tambem foi constatado que as maiores perdas ocorrem na metade sul e parte oeste, comparativamente a metade norte e a parte leste do estado. |
Palavras-Chave: |
Brasil; Déficit hídrico; Disponibilidade hídrica; Glycine max (L>) Merril; Rendimento de grãos; Rio Grande do Sul; Soybean. |
Thesagro: |
Balanço Hídrico; Deficiência Hídrica; Estiagem; Glycine Max; Perda; Seca; Soja. |
Thesaurus NAL: |
crop losses; soil water deficit. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/35559/1/Cartas-de-perda-de-rendimento-potencial-em-soja-no-Rio-Grande-do-Sul-por-deficiencia-hidrica.pdf
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Marc: |
LEADER 01902nam a2200373 a 4500 001 1820210 005 2015-06-26 008 1999 bl uuuu 00u1 u #d 022 $a1516-3830 100 1 $aCUNHA, G. R. da 245 $aCartas de perda de rendimento potencial em soja no Rio Grande do Sul por deficiência hídrica. 260 $aPasso Fundo: Embrapa Trigo$c1999 300 $a52 p. 490 $a(Embrapa Trigo. Boletim de pesquisa, 1). 520 $aA variabilidade na distribuicao de chuvas, durante o periodo de primavera-verao, e a principal limitacao a expressao do potencial de rendimento da cultura da soja no sul do Brasil. Nesse contexto, o presente estudo apresenta uma serie de mapas de perda de potencial de rendimentos em soja, no Rio Grande do Sul, por deficiencia hidrica, considerando as interacoes entre local x epoca de semeadura x ciclo de cultivares ao nivel de 80% de probabilidade. Conclui-se que a disponibilidade hidrica limita a expressao do potencial de rendimento de graos na cultura de soja em escalas regionalmente diferenciadas e que ha um gradiente de perda de potencial de rendimento por deficiencia hidrica, com aumento de magnitude no sentido de nordeste para sudoeste. Tambem foi constatado que as maiores perdas ocorrem na metade sul e parte oeste, comparativamente a metade norte e a parte leste do estado. 650 $acrop losses 650 $asoil water deficit 650 $aBalanço Hídrico 650 $aDeficiência Hídrica 650 $aEstiagem 650 $aGlycine Max 650 $aPerda 650 $aSeca 650 $aSoja 653 $aBrasil 653 $aDéficit hídrico 653 $aDisponibilidade hídrica 653 $aGlycine max (L>) Merril 653 $aRendimento de grãos 653 $aRio Grande do Sul 653 $aSoybean 700 1 $aHAAS, J. C. 700 1 $aDALMAGO, G. A. 700 1 $aPASINATO, A.
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