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Registro Completo |
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Biblioteca(s): |
Embrapa Rondônia. |
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Data corrente: |
13/01/2009 |
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Data da última atualização: |
15/12/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
CARVALHO, J. L. N.; CERRI, C. E. P.; FEIGL, B. P.; PÍCCOLO, M. C.; GODINHO, V. de P. C.; CERRI, C. C. |
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Afiliação: |
JOÃO LUÍS NUNES CARVALHO, USP; CARLOS EDUARDO PELLEGRINO CERRI, USP; BRIGITTE JOSEFINE FEIGL, USP; M. C. PÍCCOLO, USP; VICENTE DE PAULO CAMPOS GODINHO, CPAF-RO; CARLOS CLEMENTE CERRI, USP. |
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Título: |
Carbon sequestration in agricultural soils in the Cerrado region of the brazilian Amazon. |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
Soil & Tillage Research, v. 103, n. 2, p. 342-349, May 2009. |
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ISSN: |
0167-1987 |
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DOI: |
https://doi.org/10.1016/j.still.2008.10.022 |
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Idioma: |
Inglês |
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Conteúdo: |
The introduction of crop management practices after conversion of Amazon Cerrado into cropland influences soil C stocks and has direct and indirect consequences on greenhouse gases (GHG) emissions. The aim of this study was to quantify soil C sequestration, through the evaluation of the changes in C stocks, as well as the GHG fluxes (N2O and CH4) during the process of conversion of Cerrado into agricultural land in the southwestern Amazon region, comparing no-tillage (NT) and conventional tillage (CT) systems. We collected samples from soils and made gas flux measurements in July 2004 (the dry season) and in January 2005 (the wet season) at six areas: Cerrado, CT cultivated with rice for 1 year (1CT) and 2 years (2CT), and NT cultivated with soybean for 1 year (1NT), 2 years (2NT) and 3 years (3NT), in each case after a 2-year period of rice under CT. Soil samples were analyzed in both seasons for total organic C and bulk density. The soil C stocks, corrected for a mass of soil equivalent to the 0?30-cm layer under Cerrado, indicated that soils under NT had generally higher C storage compared to native Cerrado and CT soils. The annual C accumulation rate in the conversion of rice under CT into soybean under NT was 0.38 Mg ha−1 year−1. Although CO2 emissions were not used in the C sequestration estimates to avoid double counting, we did include the fluxes of this gas in our discussion. In the wet season, CO2 emissions were twice as high as in the dry season and the highest N2O emissions occurred under the NT system. There were no CH4 emissions to the atmosphere (negative fluxes) and there were no significant seasonal variations. When N2O and CH4 emissions in C-equivalent were subtracted (assuming that the measurements made on 4 days were representative of the whole year), the soil C sequestration rate of the conversion of rice under CT into soybean under NT was 0.23 Mg ha−1 year−1. Although there were positive soil C sequestration rates, our results do not present data regarding the full C balance in soil management changes in the Amazon Cerrado. MenosThe introduction of crop management practices after conversion of Amazon Cerrado into cropland influences soil C stocks and has direct and indirect consequences on greenhouse gases (GHG) emissions. The aim of this study was to quantify soil C sequestration, through the evaluation of the changes in C stocks, as well as the GHG fluxes (N2O and CH4) during the process of conversion of Cerrado into agricultural land in the southwestern Amazon region, comparing no-tillage (NT) and conventional tillage (CT) systems. We collected samples from soils and made gas flux measurements in July 2004 (the dry season) and in January 2005 (the wet season) at six areas: Cerrado, CT cultivated with rice for 1 year (1CT) and 2 years (2CT), and NT cultivated with soybean for 1 year (1NT), 2 years (2NT) and 3 years (3NT), in each case after a 2-year period of rice under CT. Soil samples were analyzed in both seasons for total organic C and bulk density. The soil C stocks, corrected for a mass of soil equivalent to the 0?30-cm layer under Cerrado, indicated that soils under NT had generally higher C storage compared to native Cerrado and CT soils. The annual C accumulation rate in the conversion of rice under CT into soybean under NT was 0.38 Mg ha−1 year−1. Although CO2 emissions were not used in the C sequestration estimates to avoid double counting, we did include the fluxes of this gas in our discussion. In the wet season, CO2 emissions were twice as high as in the dry season and th... Mostrar Tudo |
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Palavras-Chave: |
Amazon. |
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Thesagro: |
Carbono; Cerrado; Solo. |
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Thesaurus Nal: |
Amazonia; carbon; conventional tillage; greenhouse gases; no-tillage; soil. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/229260/1/cpafro-12974.pdf
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Marc: |
LEADER 03014naa a2200325 a 4500
001 1709344
005 2021-12-15
008 2009 bl uuuu u00u1 u #d
022 $a0167-1987
024 7 $ahttps://doi.org/10.1016/j.still.2008.10.022$2DOI
100 1 $aCARVALHO, J. L. N.
245 $aCarbon sequestration in agricultural soils in the Cerrado region of the brazilian Amazon.$h[electronic resource]
260 $c2009
520 $aThe introduction of crop management practices after conversion of Amazon Cerrado into cropland influences soil C stocks and has direct and indirect consequences on greenhouse gases (GHG) emissions. The aim of this study was to quantify soil C sequestration, through the evaluation of the changes in C stocks, as well as the GHG fluxes (N2O and CH4) during the process of conversion of Cerrado into agricultural land in the southwestern Amazon region, comparing no-tillage (NT) and conventional tillage (CT) systems. We collected samples from soils and made gas flux measurements in July 2004 (the dry season) and in January 2005 (the wet season) at six areas: Cerrado, CT cultivated with rice for 1 year (1CT) and 2 years (2CT), and NT cultivated with soybean for 1 year (1NT), 2 years (2NT) and 3 years (3NT), in each case after a 2-year period of rice under CT. Soil samples were analyzed in both seasons for total organic C and bulk density. The soil C stocks, corrected for a mass of soil equivalent to the 0?30-cm layer under Cerrado, indicated that soils under NT had generally higher C storage compared to native Cerrado and CT soils. The annual C accumulation rate in the conversion of rice under CT into soybean under NT was 0.38 Mg ha−1 year−1. Although CO2 emissions were not used in the C sequestration estimates to avoid double counting, we did include the fluxes of this gas in our discussion. In the wet season, CO2 emissions were twice as high as in the dry season and the highest N2O emissions occurred under the NT system. There were no CH4 emissions to the atmosphere (negative fluxes) and there were no significant seasonal variations. When N2O and CH4 emissions in C-equivalent were subtracted (assuming that the measurements made on 4 days were representative of the whole year), the soil C sequestration rate of the conversion of rice under CT into soybean under NT was 0.23 Mg ha−1 year−1. Although there were positive soil C sequestration rates, our results do not present data regarding the full C balance in soil management changes in the Amazon Cerrado.
650 $aAmazonia
650 $acarbon
650 $aconventional tillage
650 $agreenhouse gases
650 $ano-tillage
650 $asoil
650 $aCarbono
650 $aCerrado
650 $aSolo
653 $aAmazon
700 1 $aCERRI, C. E. P.
700 1 $aFEIGL, B. P.
700 1 $aPÍCCOLO, M. C.
700 1 $aGODINHO, V. de P. C.
700 1 $aCERRI, C. C.
773 $tSoil & Tillage Research$gv. 103, n. 2, p. 342-349, May 2009.
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Registro original: |
Embrapa Rondônia (CPAF-RO) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Mandioca e Fruticultura. Para informações adicionais entre em contato com cnpmf.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Mandioca e Fruticultura. |
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Data corrente: |
07/06/2017 |
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Data da última atualização: |
04/01/2018 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
TASSI, A. D.; GARITA-SALAZAR, L. C.; AMORIM, L.; NOVELLI, V. M.; ASTUA, J. de F.; CHILDERS, C. C. |
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Afiliação: |
ALINE DANIELE TASSI, ESALQ; LAURA CRISTINA GARITA-SALAZAR, ESALQ; LILIAN AMORIM; VALDENICE MOREIRA NOVELLI, APTA; JULIANA DE FREITAS ASTUA, CNPMF; CARL C. CHILDERS, IFAS. |
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Título: |
Virus-vector relationship in the Citrus leprosis pathosystem. |
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Ano de publicação: |
2017 |
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Fonte/Imprenta: |
Experimental & Applied Acarologyl, V. 71, P.227-241, 2017. |
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ISSN: |
1572-9702 |
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Idioma: |
Português |
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Conteúdo: |
Citrus leprosis has been one of the most destructive diseases of citrus in the Americas. In the last decade important progress has been achieved such as the complete genome sequencing of its main causal agent, Citrus leprosis virus C (CiLV-C), belonging to a new genus Cilevirus . It is transmitted by Brevipalpus yothersi Baker (Acari: Tenuipalpidae), and is characterized by the localized symptoms it induces on the leaves, fruits and stems. It occurs in the American continents from Mexico to Argentina. The virus was until recently considered restricted to Citrus spp. However, it was found naturally infecting other plants species as Swinglea glutinosa Merrill and Commelina benghalensis L., and has been experimentally transmitted by B. yothersi to a large number of plant species. Despite these advances little is known about the virus-vector relationship that is a key to understanding the epidemiology of the disease. Some components of the CiLV-C/ B. yothersi relationship were determined using the common bean (Phaseolus vulgaris L. cv. ?IAC Una?) as a test plant. They included: (a) the virus acquisition access period was 4 h; (b) the virus inoculation access period was 2 h; (c) the latent period between acquisition and inoculation was 7 h; (d) the period of retention of the virus by a single viruliferous mite was at least 12 days; (d) the percentage of viruliferous individuals from mite colonies on infected tissues ranged from 25 to 60%. The experiments confirmed previous data that all developmental stages of B. yothersi (larva, protonymph and deutonymph, adult female and male) were able to transmit CiLV-C and that transovarial transmission of the virus did not occur. CiLV-C can be acquired from lesions on leaves, fruits and stems by B .yothersi. Based on the distribution of lesions produced by single viruliferous B. yothersi on bean leaves, it is concluded that they tend to feed in restricted areas, usually near the veins. The short latent and transmission periods during the larval stage suggest that the CiLV-C/ B. yothersi relationship is of the persistent circulative type. MenosCitrus leprosis has been one of the most destructive diseases of citrus in the Americas. In the last decade important progress has been achieved such as the complete genome sequencing of its main causal agent, Citrus leprosis virus C (CiLV-C), belonging to a new genus Cilevirus . It is transmitted by Brevipalpus yothersi Baker (Acari: Tenuipalpidae), and is characterized by the localized symptoms it induces on the leaves, fruits and stems. It occurs in the American continents from Mexico to Argentina. The virus was until recently considered restricted to Citrus spp. However, it was found naturally infecting other plants species as Swinglea glutinosa Merrill and Commelina benghalensis L., and has been experimentally transmitted by B. yothersi to a large number of plant species. Despite these advances little is known about the virus-vector relationship that is a key to understanding the epidemiology of the disease. Some components of the CiLV-C/ B. yothersi relationship were determined using the common bean (Phaseolus vulgaris L. cv. ?IAC Una?) as a test plant. They included: (a) the virus acquisition access period was 4 h; (b) the virus inoculation access period was 2 h; (c) the latent period between acquisition and inoculation was 7 h; (d) the period of retention of the virus by a single viruliferous mite was at least 12 days; (d) the percentage of viruliferous individuals from mite colonies on infected tissues ranged from 25 to 60%. The experiments confirmed previous data t... Mostrar Tudo |
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Palavras-Chave: |
Frutacítrica. |
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Thesagro: |
Doença de planta. |
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Thesaurus NAL: |
Citrus. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02746naa a2200229 a 4500
001 2070508
005 2018-01-04
008 2017 bl uuuu u00u1 u #d
022 $a1572-9702
100 1 $aTASSI, A. D.
245 $aVirus-vector relationship in the Citrus leprosis pathosystem.$h[electronic resource]
260 $c2017
520 $aCitrus leprosis has been one of the most destructive diseases of citrus in the Americas. In the last decade important progress has been achieved such as the complete genome sequencing of its main causal agent, Citrus leprosis virus C (CiLV-C), belonging to a new genus Cilevirus . It is transmitted by Brevipalpus yothersi Baker (Acari: Tenuipalpidae), and is characterized by the localized symptoms it induces on the leaves, fruits and stems. It occurs in the American continents from Mexico to Argentina. The virus was until recently considered restricted to Citrus spp. However, it was found naturally infecting other plants species as Swinglea glutinosa Merrill and Commelina benghalensis L., and has been experimentally transmitted by B. yothersi to a large number of plant species. Despite these advances little is known about the virus-vector relationship that is a key to understanding the epidemiology of the disease. Some components of the CiLV-C/ B. yothersi relationship were determined using the common bean (Phaseolus vulgaris L. cv. ?IAC Una?) as a test plant. They included: (a) the virus acquisition access period was 4 h; (b) the virus inoculation access period was 2 h; (c) the latent period between acquisition and inoculation was 7 h; (d) the period of retention of the virus by a single viruliferous mite was at least 12 days; (d) the percentage of viruliferous individuals from mite colonies on infected tissues ranged from 25 to 60%. The experiments confirmed previous data that all developmental stages of B. yothersi (larva, protonymph and deutonymph, adult female and male) were able to transmit CiLV-C and that transovarial transmission of the virus did not occur. CiLV-C can be acquired from lesions on leaves, fruits and stems by B .yothersi. Based on the distribution of lesions produced by single viruliferous B. yothersi on bean leaves, it is concluded that they tend to feed in restricted areas, usually near the veins. The short latent and transmission periods during the larval stage suggest that the CiLV-C/ B. yothersi relationship is of the persistent circulative type.
650 $aCitrus
650 $aDoença de planta
653 $aFrutacítrica
700 1 $aGARITA-SALAZAR, L. C.
700 1 $aAMORIM, L.
700 1 $aNOVELLI, V. M.
700 1 $aASTUA, J. de F.
700 1 $aCHILDERS, C. C.
773 $tExperimental & Applied Acarologyl, V. 71, P.227-241, 2017.
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Embrapa Mandioca e Fruticultura (CNPMF) |
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