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Registro Completo |
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Biblioteca(s): |
Embrapa Meio Ambiente. |
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Data corrente: |
03/07/2007 |
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Data da última atualização: |
14/11/2018 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
ROCHA, H. R. da; FREITAS, H. C.; ROSOLEM, R.; JUÁREZ, R. I. N.; TANNUS, R. N.; LIGO, M. A. V.; CABRAL, O. M. R.; DIAS, M. A. F. S. |
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Afiliação: |
HUMBERTO R. da ROCHA, Departamento de Ciências Atmosféricas, IAG/Universidade de São Paulo; HELBER C. FREITAS, Departamento de Ciências Atmosféricas, IAG/Universidade de São Paulo; RAFAEL ROSOLEM, Departamento de Ciências Atmosféricas, IAG/Universidade de São Paulo; Robinson I.N. Juárez ROBINSON I. N. JUÁREZ, Departamento de Ciências Atmosféricas, IAG/Universidade de São Paulo; RAFAEL N. TANNUS, Departamento de Ciências Atmosféricas, IAG/Universidade de São Paulo; MARCOS ANTONIO VIEIRA LIGO, CNPMA; OSVALDO MACHADO RODRIGUES CABRAL, CNPMA; MARIA A. F. SILVA DIAS, Departamento de Ciências Atmosféricas, IAG/Universidade de São Paulo. |
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Título: |
Measurements of CO2 exchange over a woodland savanna (Cerrado Sensu stricto) in southeast Brasil. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
Biota Neotropica, Campinas, v. 2, n. 1, p. 1-11, 2002. |
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Idioma: |
Inglês |
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Conteúdo: |
The technique of eddy correlation was used to measure the net ecosystem exchange over a woodland savanna (Cerrado Sensu stricto) site (Gleba Pé de Gigante) in southeast Brazil. The data set included measurements of climatological variables and soil respiration using static soil chambers. Data were collected during the period from 10 October 2000 to 30 March 2002. Measured soil respiration showed average values of 4.8 molCO m-2s-1 year round. Its 2 seasonal differences varied from 2 to 8 molCO m-2s-1 (Q = 4.9) during the dry (April to August) and wet season, respectively, and was concurrent with soil temperature and moisture variability. The net ecosystem CO2 flux (NEE) variability is controlled by solar radiation, temperature and air humidity on diel course. Seasonally, soil moisture plays a strong role by inducing litterfall, reducing canopy photosynthetic activity and soil respiration. The net sign of NEE is negative (sink) in the wet season and early dry season, with rates around -25 kgC ha-1day-1, and values as low as 40 kgC ha- 1day-1. NEE was positive (source) during most of the dry season, and changed into negative at the onset of rainy season. At critical times of soil moisture stress during the late dry season, the ecosystem experienced photosynthesis during daytime, although the net sign is positive (emission). Concurrent with dry season, the values appeared progressively positive from 5 to as much as 50 kgC ha-1day-1. The annual NEE sum appeared to be nearly in balance, or more exactly a small sink, equal to 0.1 0.3 tC ha-1yr-1, which we regard possibly as a realistic one, giving the constraining conditions imposed to the turbulent flux calculation, and favourable hypothesis of succession stages, climatic variability and CO2 fertilization. MenosThe technique of eddy correlation was used to measure the net ecosystem exchange over a woodland savanna (Cerrado Sensu stricto) site (Gleba Pé de Gigante) in southeast Brazil. The data set included measurements of climatological variables and soil respiration using static soil chambers. Data were collected during the period from 10 October 2000 to 30 March 2002. Measured soil respiration showed average values of 4.8 molCO m-2s-1 year round. Its 2 seasonal differences varied from 2 to 8 molCO m-2s-1 (Q = 4.9) during the dry (April to August) and wet season, respectively, and was concurrent with soil temperature and moisture variability. The net ecosystem CO2 flux (NEE) variability is controlled by solar radiation, temperature and air humidity on diel course. Seasonally, soil moisture plays a strong role by inducing litterfall, reducing canopy photosynthetic activity and soil respiration. The net sign of NEE is negative (sink) in the wet season and early dry season, with rates around -25 kgC ha-1day-1, and values as low as 40 kgC ha- 1day-1. NEE was positive (source) during most of the dry season, and changed into negative at the onset of rainy season. At critical times of soil moisture stress during the late dry season, the ecosystem experienced photosynthesis during daytime, although the net sign is positive (emission). Concurrent with dry season, the values appeared progressively positive from 5 to as much as 50 kgC ha-1day-1. The annual NEE sum appeared to be nearly in ba... Mostrar Tudo |
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Palavras-Chave: |
Savana; Sequestro de carbono. |
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Thesagro: |
Cerrado; Fotossíntese; Respiração. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/163805/1/Rocha-Measurements-6956.pdf
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Marc: |
LEADER 02545naa a2200265 a 4500
001 1015529
005 2018-11-14
008 2002 bl uuuu u00u1 u #d
100 1 $aROCHA, H. R. da
245 $aMeasurements of CO2 exchange over a woodland savanna (Cerrado Sensu stricto) in southeast Brasil.$h[electronic resource]
260 $c2002
520 $aThe technique of eddy correlation was used to measure the net ecosystem exchange over a woodland savanna (Cerrado Sensu stricto) site (Gleba Pé de Gigante) in southeast Brazil. The data set included measurements of climatological variables and soil respiration using static soil chambers. Data were collected during the period from 10 October 2000 to 30 March 2002. Measured soil respiration showed average values of 4.8 molCO m-2s-1 year round. Its 2 seasonal differences varied from 2 to 8 molCO m-2s-1 (Q = 4.9) during the dry (April to August) and wet season, respectively, and was concurrent with soil temperature and moisture variability. The net ecosystem CO2 flux (NEE) variability is controlled by solar radiation, temperature and air humidity on diel course. Seasonally, soil moisture plays a strong role by inducing litterfall, reducing canopy photosynthetic activity and soil respiration. The net sign of NEE is negative (sink) in the wet season and early dry season, with rates around -25 kgC ha-1day-1, and values as low as 40 kgC ha- 1day-1. NEE was positive (source) during most of the dry season, and changed into negative at the onset of rainy season. At critical times of soil moisture stress during the late dry season, the ecosystem experienced photosynthesis during daytime, although the net sign is positive (emission). Concurrent with dry season, the values appeared progressively positive from 5 to as much as 50 kgC ha-1day-1. The annual NEE sum appeared to be nearly in balance, or more exactly a small sink, equal to 0.1 0.3 tC ha-1yr-1, which we regard possibly as a realistic one, giving the constraining conditions imposed to the turbulent flux calculation, and favourable hypothesis of succession stages, climatic variability and CO2 fertilization.
650 $aCerrado
650 $aFotossíntese
650 $aRespiração
653 $aSavana
653 $aSequestro de carbono
700 1 $aFREITAS, H. C.
700 1 $aROSOLEM, R.
700 1 $aJUÁREZ, R. I. N.
700 1 $aTANNUS, R. N.
700 1 $aLIGO, M. A. V.
700 1 $aCABRAL, O. M. R.
700 1 $aDIAS, M. A. F. S.
773 $tBiota Neotropica, Campinas$gv. 2, n. 1, p. 1-11, 2002.
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Registro original: |
Embrapa Meio Ambiente (CNPMA) |
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Registro Completo
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Biblioteca(s): |
Embrapa Amazônia Ocidental. |
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Data corrente: |
18/12/2020 |
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Data da última atualização: |
26/02/2021 |
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Tipo da produção científica: |
Comunicado Técnico/Recomendações Técnicas |
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Autoria: |
OLIVEIRA, I. J. de; BARRETO, J. F.; FONTES, J. R. A.; GUIMARAES, P. E. de O.; GUIMARAES, L. J. M. |
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Afiliação: |
INOCENCIO JUNIOR DE OLIVEIRA, CPAA; JOAO FERDINANDO BARRETO, CPAA; JOSE ROBERTO ANTONIOL FONTES, CPAA; PAULO EVARISTO DE O GUIMARAES, CNPMS; LAURO JOSE MOREIRA GUIMARAES, CNPMS. |
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Título: |
Cultivar BRS 4105 - nova variedade de milho para o Amazonas. |
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Ano de publicação: |
2020 |
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Fonte/Imprenta: |
Manaus: Embrapa Amazônia Ocidental, 2020. |
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Páginas: |
8 p. |
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Série: |
(Embrapa Amazônia Ocidental. Comunicado técnico, 148). |
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ISSN: |
1517-3887 |
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Idioma: |
Português |
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Conteúdo: |
Ambientes de avaliação. Desempenho produtivo. Recomendações para cultivo. |
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Thesagro: |
Milho. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/221522/1/ComTec148.pdf
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Marc: |
LEADER 00690nam a2200205 a 4500
001 2128451
005 2021-02-26
008 2020 bl uuuu u0uu1 u #d
022 $a1517-3887
100 1 $aOLIVEIRA, I. J. de
245 $aCultivar BRS 4105 - nova variedade de milho para o Amazonas.$h[electronic resource]
260 $aManaus: Embrapa Amazônia Ocidental$c2020
300 $a8 p.
490 $a(Embrapa Amazônia Ocidental. Comunicado técnico, 148).
520 $aAmbientes de avaliação. Desempenho produtivo. Recomendações para cultivo.
650 $aMilho
700 1 $aBARRETO, J. F.
700 1 $aFONTES, J. R. A.
700 1 $aGUIMARAES, P. E. de O.
700 1 $aGUIMARAES, L. J. M.
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Embrapa Amazônia Ocidental (CPAA) |
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