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 | Acesso ao texto completo restrito à biblioteca da Embrapa Cerrados. Para informações adicionais entre em contato com cpac.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
21/08/2017 |
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Data da última atualização: |
06/09/2017 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BRITO, D. Q.; PASSOS, C. J. S.; MUNIZ, D. H. de F.; OLIVEIRA FILHO, E. C. de. |
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Afiliação: |
DARLAN Q. BRITO; CARLOS JOSÉ S. PASSOS; DAPHNE HELOISA DE FREITAS MUNIZ, CPAC; EDUARDO CYRINO DE OLIVEIRA FILHO, CPAC. |
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Título: |
Aquatic ecotoxicity of ashes from Brazilian savanna wildfires. |
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Ano de publicação: |
2017 |
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Fonte/Imprenta: |
Environmental Science and Pollution Research, v. 24, n. 24, p. 19671-19682, August 2017. |
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DOI: |
10.1007/s11356-017-9578-0 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: In a global scenario of climate change, several studies have predicted an increase in fires in different parts of the world. With the occurrence of rains following the fires in the Brazilian savanna (Cerrado biome), the compounds present in ashes may enter aquatic environments and cause adverse effects to these ecosystems. In this context, this study evaluated the potential toxicity of ashes from two areas of Cerrado and an area of pasture, through ecotoxicological bioassays and using three aquatic species from distinct trophic levels, which were exposed to different dilutions of ashes: the microcrustacean Ceriodaphnia dubia, the fish Danio rerio and the mollusc Biomphalaria glabrata. The ashes from the three sampled areas showed higher concentrations of some elements in relation to the soil samples (B, Ca, K, Mg, Mn, P, S, Si, Sr, Zn), but only a small quantity of these compounds was solubilised. Our data showed that all ash samples caused acute toxicity to C. dubia (48hs-LC50 = 13.4 g L?1; 48hs-LC50 = 6.33 g L?1; 48hs-LC50 = 9.73 g L?1 respectively for transition area, pasture, typical cerrado areas), while in relation to D. rerio and B. glabrata, no acute toxicity was observed when they were exposed to ashes from native Cerrado vegetation and pasture areas. Ashes from a transition area showed toxicity for D. rerio (48hs-LC50 = 25.0 g L?1); possibly, this was due to the combination of multiple preponderant inorganic elements of ashes with other organic compounds not analysed, such as polycyclic aromatic hydrocarbons (PAHs). In summary, these results suggest that wildfires may pose risks to zooplankton communities and emphasize the need for more studies to better understand the complexity of the ecological effects of fire on aquatic ecosystems. MenosAbstract: In a global scenario of climate change, several studies have predicted an increase in fires in different parts of the world. With the occurrence of rains following the fires in the Brazilian savanna (Cerrado biome), the compounds present in ashes may enter aquatic environments and cause adverse effects to these ecosystems. In this context, this study evaluated the potential toxicity of ashes from two areas of Cerrado and an area of pasture, through ecotoxicological bioassays and using three aquatic species from distinct trophic levels, which were exposed to different dilutions of ashes: the microcrustacean Ceriodaphnia dubia, the fish Danio rerio and the mollusc Biomphalaria glabrata. The ashes from the three sampled areas showed higher concentrations of some elements in relation to the soil samples (B, Ca, K, Mg, Mn, P, S, Si, Sr, Zn), but only a small quantity of these compounds was solubilised. Our data showed that all ash samples caused acute toxicity to C. dubia (48hs-LC50 = 13.4 g L?1; 48hs-LC50 = 6.33 g L?1; 48hs-LC50 = 9.73 g L?1 respectively for transition area, pasture, typical cerrado areas), while in relation to D. rerio and B. glabrata, no acute toxicity was observed when they were exposed to ashes from native Cerrado vegetation and pasture areas. Ashes from a transition area showed toxicity for D. rerio (48hs-LC50 = 25.0 g L?1); possibly, this was due to the combination of multiple preponderant inorganic elements of ashes with other organic compounds ... Mostrar Tudo |
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Thesagro: |
Cerrado; Fogo; Organismo aquático; Queimada. |
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Categoria do assunto: |
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Marc: |
LEADER 02420naa a2200217 a 4500
001 2074231
005 2017-09-06
008 2017 bl uuuu u00u1 u #d
024 7 $a10.1007/s11356-017-9578-0$2DOI
100 1 $aBRITO, D. Q.
245 $aAquatic ecotoxicity of ashes from Brazilian savanna wildfires.
260 $c2017
520 $aAbstract: In a global scenario of climate change, several studies have predicted an increase in fires in different parts of the world. With the occurrence of rains following the fires in the Brazilian savanna (Cerrado biome), the compounds present in ashes may enter aquatic environments and cause adverse effects to these ecosystems. In this context, this study evaluated the potential toxicity of ashes from two areas of Cerrado and an area of pasture, through ecotoxicological bioassays and using three aquatic species from distinct trophic levels, which were exposed to different dilutions of ashes: the microcrustacean Ceriodaphnia dubia, the fish Danio rerio and the mollusc Biomphalaria glabrata. The ashes from the three sampled areas showed higher concentrations of some elements in relation to the soil samples (B, Ca, K, Mg, Mn, P, S, Si, Sr, Zn), but only a small quantity of these compounds was solubilised. Our data showed that all ash samples caused acute toxicity to C. dubia (48hs-LC50 = 13.4 g L?1; 48hs-LC50 = 6.33 g L?1; 48hs-LC50 = 9.73 g L?1 respectively for transition area, pasture, typical cerrado areas), while in relation to D. rerio and B. glabrata, no acute toxicity was observed when they were exposed to ashes from native Cerrado vegetation and pasture areas. Ashes from a transition area showed toxicity for D. rerio (48hs-LC50 = 25.0 g L?1); possibly, this was due to the combination of multiple preponderant inorganic elements of ashes with other organic compounds not analysed, such as polycyclic aromatic hydrocarbons (PAHs). In summary, these results suggest that wildfires may pose risks to zooplankton communities and emphasize the need for more studies to better understand the complexity of the ecological effects of fire on aquatic ecosystems.
650 $aCerrado
650 $aFogo
650 $aOrganismo aquático
650 $aQueimada
700 1 $aPASSOS, C. J. S.
700 1 $aMUNIZ, D. H. de F.
700 1 $aOLIVEIRA FILHO, E. C. de
773 $tEnvironmental Science and Pollution Research$gv. 24, n. 24, p. 19671-19682, August 2017.
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Embrapa Cerrados (CPAC) |
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Biblioteca(s): |
Embrapa Gado de Leite. |
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Data corrente: |
05/03/2013 |
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Data da última atualização: |
09/08/2022 |
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Tipo da produção científica: |
Nota Técnica/Nota Científica |
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Autoria: |
BARBIERI JUNIOR, E.; ROSSIELO, R. O. P.; SILVA, R. V. M. M.; RIBEIRO, R. C.; MORENZ, M. J. F. |
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Afiliação: |
ELIO BARBIERI JUNIOR, UFRRJ; ROBERTO OSCAR PEREYRA ROSSIELO, UFRRJ; ROSANI VALÉRIA MARCELINA MATOSO SILVA, UFRRJ; ROBERTA CRISTIANE RIBEIRO, IFMT; MIRTON JOSE FROTA MORENZ, CNPGL. |
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Título: |
Um novo clorofilômetro para estimar os teores de clorofila em folhas de capim Tifton 85. |
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Ano de publicação: |
2012 |
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Fonte/Imprenta: |
Ciência Rural, v. 42, n. 12, p. 2242-2245, 2012. |
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DOI: |
https://doi.org/10.1590/S0103-84782012005000109 |
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Idioma: |
Português |
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Conteúdo: |
RESUMO - O propósito deste trabalho foi verificar o desempenho de um novo clorofilometro portátil, em parcelas experimentais vegetadas com o capim-Tifton 85 (Cynodon spp.). Para tal, foi utilizado um experimento de curta duração, em que três doses de N (0,75 e 150kg de N ha-1) foram combinadas com quatro datas de amostragem (8, 16, 24 e 28 dias após um corte de uniformização). As análises foram feitas em lâminas da folha mais nova totalmente expandida. Os teores das clorofilas a, b e a+b foram quantificados espectrofotometricamente após a extração com acetona 80%, enquanto que o clorofilômetro forneceu os correspondentes valores de Índice de Clorofila Falker (ICF). As leituras do aparelho foram sensíveis tanto às doses de N quanto às datas de amostragem. Foram obtidas correlações positivas entre ambos os métodos de quantificação (clorofila a: r=0,646; b: r=0,797; e total: r=0,721), que evidenciaram a utilidade desse novo clorofilometro na determinação indireta dos teores de clorofila foliar no capim-Tifton 85. ABSTRACT - The purpose of this research was to evaluate the performance of a new portable chlorophyll meter in the indirect determination of chlorophyll contents in Tifton 85 bermudagrass leaves. In a field trial of short duration, three N doses (0, 75 and 150kg ha-1) were combined with four sampling dates (8, 16, 24 e 28 days after a cut for sward uniformity) in completely randomized blocks, with treatments arranged in a split-plot design. Analyses were performed in the youngest fully expanded leaf blade. Contents of chlorophylls a, b and total were quantified spectrophotometrically, after extraction with acetone 80%, while chlorophyll meter readings, expressed as Falker Chlorophyll Index (FCI) units, provided the same information. Chlorophyll meter readings were sensitive to both N rates and sampling dates. It were obtained significant positive correlations between both methods (chlorophyll a: r=0.646, chlorophyll b: r=0.797 and for total chlorophyll: r=0.721). It was concluded that this new chlorophyll meter constitutes an appropriate tool for the indirect determination of foliar chlorophyll contents in Tifton 85 pastures. MenosRESUMO - O propósito deste trabalho foi verificar o desempenho de um novo clorofilometro portátil, em parcelas experimentais vegetadas com o capim-Tifton 85 (Cynodon spp.). Para tal, foi utilizado um experimento de curta duração, em que três doses de N (0,75 e 150kg de N ha-1) foram combinadas com quatro datas de amostragem (8, 16, 24 e 28 dias após um corte de uniformização). As análises foram feitas em lâminas da folha mais nova totalmente expandida. Os teores das clorofilas a, b e a+b foram quantificados espectrofotometricamente após a extração com acetona 80%, enquanto que o clorofilômetro forneceu os correspondentes valores de Índice de Clorofila Falker (ICF). As leituras do aparelho foram sensíveis tanto às doses de N quanto às datas de amostragem. Foram obtidas correlações positivas entre ambos os métodos de quantificação (clorofila a: r=0,646; b: r=0,797; e total: r=0,721), que evidenciaram a utilidade desse novo clorofilometro na determinação indireta dos teores de clorofila foliar no capim-Tifton 85. ABSTRACT - The purpose of this research was to evaluate the performance of a new portable chlorophyll meter in the indirect determination of chlorophyll contents in Tifton 85 bermudagrass leaves. In a field trial of short duration, three N doses (0, 75 and 150kg ha-1) were combined with four sampling dates (8, 16, 24 e 28 days after a cut for sward uniformity) in completely randomized blocks, with treatments arranged in a split-plot design. Analyses were performed in t... Mostrar Tudo |
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Palavras-Chave: |
Adubação nitrogenada; Clorofila total; Cynodon spp. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/952180/1/Um-novo-clorofilometro-para-estimar-os-teores-de-clorofila-em-folhas-de-capim-Tifton-85.pdf
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Marc: |
LEADER 02887naa a2200217 a 4500
001 1952180
005 2022-08-09
008 2012 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1590/S0103-84782012005000109$2DOI
100 1 $aBARBIERI JUNIOR, E.
245 $aUm novo clorofilômetro para estimar os teores de clorofila em folhas de capim Tifton 85.$h[electronic resource]
260 $c2012
520 $aRESUMO - O propósito deste trabalho foi verificar o desempenho de um novo clorofilometro portátil, em parcelas experimentais vegetadas com o capim-Tifton 85 (Cynodon spp.). Para tal, foi utilizado um experimento de curta duração, em que três doses de N (0,75 e 150kg de N ha-1) foram combinadas com quatro datas de amostragem (8, 16, 24 e 28 dias após um corte de uniformização). As análises foram feitas em lâminas da folha mais nova totalmente expandida. Os teores das clorofilas a, b e a+b foram quantificados espectrofotometricamente após a extração com acetona 80%, enquanto que o clorofilômetro forneceu os correspondentes valores de Índice de Clorofila Falker (ICF). As leituras do aparelho foram sensíveis tanto às doses de N quanto às datas de amostragem. Foram obtidas correlações positivas entre ambos os métodos de quantificação (clorofila a: r=0,646; b: r=0,797; e total: r=0,721), que evidenciaram a utilidade desse novo clorofilometro na determinação indireta dos teores de clorofila foliar no capim-Tifton 85. ABSTRACT - The purpose of this research was to evaluate the performance of a new portable chlorophyll meter in the indirect determination of chlorophyll contents in Tifton 85 bermudagrass leaves. In a field trial of short duration, three N doses (0, 75 and 150kg ha-1) were combined with four sampling dates (8, 16, 24 e 28 days after a cut for sward uniformity) in completely randomized blocks, with treatments arranged in a split-plot design. Analyses were performed in the youngest fully expanded leaf blade. Contents of chlorophylls a, b and total were quantified spectrophotometrically, after extraction with acetone 80%, while chlorophyll meter readings, expressed as Falker Chlorophyll Index (FCI) units, provided the same information. Chlorophyll meter readings were sensitive to both N rates and sampling dates. It were obtained significant positive correlations between both methods (chlorophyll a: r=0.646, chlorophyll b: r=0.797 and for total chlorophyll: r=0.721). It was concluded that this new chlorophyll meter constitutes an appropriate tool for the indirect determination of foliar chlorophyll contents in Tifton 85 pastures.
653 $aAdubação nitrogenada
653 $aClorofila total
653 $aCynodon spp
700 1 $aROSSIELO, R. O. P.
700 1 $aSILVA, R. V. M. M.
700 1 $aRIBEIRO, R. C.
700 1 $aMORENZ, M. J. F.
773 $tCiência Rural$gv. 42, n. 12, p. 2242-2245, 2012.
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