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| 3. |  | CARVALHO, S.; SILVA, M. de F. F. da; CERUTTI, R.; PIVATO, J.; OLIVEIRA, J. de; OLIVEIRA, R. de; RAMOS, V.; CREMONESE, R. B. Desempenho e características da carcaça de cordeiros alimentados com diferentes relaçoes volumosos : concentrado. In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 42., 2005, Goiânia. A produção animal e o foco no agronegócio: anais. Goiânia: Sociedade Brasileira de Zootecnia, 2005. 5 f. CD ROM.| Biblioteca(s): Embrapa Caprinos e Ovinos. |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Amazônia Oriental. Para informações adicionais entre em contato com cpatu.biblioteca@embrapa.br. |
Registro Completo
|
Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
31/08/1999 |
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Data da última atualização: |
06/12/2022 |
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Autoria: |
HOLSCHER, D.; SÁ, T. D. de A.; BASTOS, T. X.; DENICH, M.; FOLSTER, H. |
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Afiliação: |
TATIANA DEANE DE ABREU SA, CPATU; THEREZINHA XAVIER BASTOS, CPATU. |
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Título: |
Evaporation from young secondary vegetation in eastern Amazonia. |
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Ano de publicação: |
1997 |
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Fonte/Imprenta: |
Journal of Hydrology, v.193, p.293-305, 1997. |
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Descrição Física: |
il. |
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DOI: |
http://dx.doi.org/10.1016/S0022-1694(96)03145-9 |
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Idioma: |
Inglês |
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Conteúdo: |
The fallow vegetation of the slash and burn agriculture in eastern Amazonia is dominated by shrubs and trees. This study of evaporation from such secondary vegetation started when the above-ground parts of the vegetation were approximately 2.5 years old. The results are based mainly on a data set containing 231 days of micrometeorological observations in the period from April 1992 to April 1993. Evaporation values obtained with the Penman open water formula ranged from 1.1 to 7.2 mm d?1, with an overall mean of 4.6 mm d?1. Actual evaporation, calculated with the Bowen ratio approach, varied from 1.2 to 5.9 mm d?1, with an overall mean of 3.9 mm d?1. Due to the high net radiation and vapour pressure deficit, and the evenly distributed moderate rainfall, the actual evaporation was constantly high during the transition between the rainy and dry seasons. In a relatively dry period, water limitations were indicated by a decrease in the actual evaporation compared with the Penman open water evaporation. Day-to-day variability was pronounced in the rainy season. An overall average of 79% of the net radiation was converted to latent heat flux. The annual evaporation was calculated by an interpolation of missing data with the continuously observed net radiation. The total actual evaporation was estimated to be 1364 mm a?1, against rainfall of 1819 mm a?1; the remaining 455 mm were allocated to drainage. When actual evaporation exceeded rainfall during the dry season, there had to be access to water storage down to depths of more than 3 m. We conclude that the young secondary vegetation can re-evaporate an important part of the rainfall input in spite of the marked seasonal distribution of rainfall. Possible regional climatic changes due to deforestation may be less severe in areas where woody secondary vegetation plays an important role in land cover. MenosThe fallow vegetation of the slash and burn agriculture in eastern Amazonia is dominated by shrubs and trees. This study of evaporation from such secondary vegetation started when the above-ground parts of the vegetation were approximately 2.5 years old. The results are based mainly on a data set containing 231 days of micrometeorological observations in the period from April 1992 to April 1993. Evaporation values obtained with the Penman open water formula ranged from 1.1 to 7.2 mm d?1, with an overall mean of 4.6 mm d?1. Actual evaporation, calculated with the Bowen ratio approach, varied from 1.2 to 5.9 mm d?1, with an overall mean of 3.9 mm d?1. Due to the high net radiation and vapour pressure deficit, and the evenly distributed moderate rainfall, the actual evaporation was constantly high during the transition between the rainy and dry seasons. In a relatively dry period, water limitations were indicated by a decrease in the actual evaporation compared with the Penman open water evaporation. Day-to-day variability was pronounced in the rainy season. An overall average of 79% of the net radiation was converted to latent heat flux. The annual evaporation was calculated by an interpolation of missing data with the continuously observed net radiation. The total actual evaporation was estimated to be 1364 mm a?1, against rainfall of 1819 mm a?1; the remaining 455 mm were allocated to drainage. When actual evaporation exceeded rainfall during the dry season, there had to be ... Mostrar Tudo |
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Palavras-Chave: |
Brasil. |
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Thesagro: |
Climatologia; Evaporação; Vegetação Secundária. |
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Thesaurus NAL: |
Amazonia; climatology; evaporation; secondary forests. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02672naa a2200289 a 4500
001 1400163
005 2022-12-06
008 1997 bl uuuu u00u1 u #d
024 7 $ahttp://dx.doi.org/10.1016/S0022-1694(96)03145-9$2DOI
100 1 $aHOLSCHER, D.
245 $aEvaporation from young secondary vegetation in eastern Amazonia.$h[electronic resource]
260 $c1997
300 $cil.
520 $aThe fallow vegetation of the slash and burn agriculture in eastern Amazonia is dominated by shrubs and trees. This study of evaporation from such secondary vegetation started when the above-ground parts of the vegetation were approximately 2.5 years old. The results are based mainly on a data set containing 231 days of micrometeorological observations in the period from April 1992 to April 1993. Evaporation values obtained with the Penman open water formula ranged from 1.1 to 7.2 mm d?1, with an overall mean of 4.6 mm d?1. Actual evaporation, calculated with the Bowen ratio approach, varied from 1.2 to 5.9 mm d?1, with an overall mean of 3.9 mm d?1. Due to the high net radiation and vapour pressure deficit, and the evenly distributed moderate rainfall, the actual evaporation was constantly high during the transition between the rainy and dry seasons. In a relatively dry period, water limitations were indicated by a decrease in the actual evaporation compared with the Penman open water evaporation. Day-to-day variability was pronounced in the rainy season. An overall average of 79% of the net radiation was converted to latent heat flux. The annual evaporation was calculated by an interpolation of missing data with the continuously observed net radiation. The total actual evaporation was estimated to be 1364 mm a?1, against rainfall of 1819 mm a?1; the remaining 455 mm were allocated to drainage. When actual evaporation exceeded rainfall during the dry season, there had to be access to water storage down to depths of more than 3 m. We conclude that the young secondary vegetation can re-evaporate an important part of the rainfall input in spite of the marked seasonal distribution of rainfall. Possible regional climatic changes due to deforestation may be less severe in areas where woody secondary vegetation plays an important role in land cover.
650 $aAmazonia
650 $aclimatology
650 $aevaporation
650 $asecondary forests
650 $aClimatologia
650 $aEvaporação
650 $aVegetação Secundária
653 $aBrasil
700 1 $aSÁ, T. D. de A.
700 1 $aBASTOS, T. X.
700 1 $aDENICH, M.
700 1 $aFOLSTER, H.
773 $tJournal of Hydrology$gv.193, p.293-305, 1997.
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