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Registro Completo |
Biblioteca(s): |
Embrapa Amazônia Oriental. |
Data corrente: |
10/05/1997 |
Data da última atualização: |
07/07/2020 |
Autoria: |
NEPSTAD, D. C.; CARVALHO, C. R. de; DAVIDSON, E. A.; JIPP, P. H.; LEFEBIRE, P. A.; NEGREIROS, G. H.; SILVA, E. D. da; STONE, T. A.; TRUMBORE, S. E. |
Afiliação: |
Daniel C. Nepstad, Woods Hole Research Center; CLAUDIO JOSE REIS DE CARVALHO, CPATU; Eric A. Davidson, Woods Hole Research Center; Peter H. Jipp, Woods Hole Research Center; Paul A. Lefebvre, Woods Hole Research Center; Gustavo H. Negreiros, Woods Hole Research Center; Elson D. da Silva, CPATU; Thomas A. Stone, Woods Hole Research Center; Susan E. Trumbore, University of Californi. |
Título: |
The role of deep roots in the hydrological and carbon cycles of Amazonian forests and pastures. |
Ano de publicação: |
1994 |
Fonte/Imprenta: |
Nature, v. 372, n. 6507, p.666-669, Dec. 1994. |
DOI: |
10.1038/372666a0 |
Idioma: |
Inglês |
Conteúdo: |
DEFORESTATION and logging transform more forest in eastern and southern Amazonia than in any other region of the world1?3. This forest alteration affects regional hydrology4?11 and the global carbon cycle12?14, but current analyses of these effects neglect an important deep-soil link between the water and carbon cycles. Using rainfall data, satellite imagery and field studies, we estimate here that half of the closed forests of Brazilian Amazonia depend on deep root systems to maintain green canopies during the dry season. Evergreen forests in northeastern Pará state maintain evapotranspiration during five-month dry periods by absorbing water from the soil to depths of more than 8m. In contrast, although the degraded pastures of this region also contain deep-rooted woody plants, most pasture plants substantially reduce their leaf canopy in response to seasonal drought, thus reducing dry-season evapotranspiration and increasing potential subsurface runoff relative to the forests they replace. Deep roots that extract water also provide carbon to the soil. The forest soil below 1 m depth contains more carbon than does above-ground biomass, and as much as 15% of this deep-soil carbon turns over on annual or decadal timescales. Thus, forest alteration that affects depth distributions of carbon inputs from roots may also affect net carbon storage in the soil. |
Palavras-Chave: |
Brasil; Ciclagem de carbono; Cycling; Essecia florestal; Forest; Plants; Profundidade da raiz. |
Thesagro: |
Balanço Hídrico; Floresta; Pastagem; Planta. |
Thesaurus Nal: |
Amazonia; depth; forest trees; pastures; roots; water balance. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02493naa a2200433 a 4500 001 1373121 005 2020-07-07 008 1994 bl uuuu u00u1 u #d 024 7 $a10.1038/372666a0$2DOI 100 1 $aNEPSTAD, D. C. 245 $aThe role of deep roots in the hydrological and carbon cycles of Amazonian forests and pastures. 260 $c1994 520 $aDEFORESTATION and logging transform more forest in eastern and southern Amazonia than in any other region of the world1?3. This forest alteration affects regional hydrology4?11 and the global carbon cycle12?14, but current analyses of these effects neglect an important deep-soil link between the water and carbon cycles. Using rainfall data, satellite imagery and field studies, we estimate here that half of the closed forests of Brazilian Amazonia depend on deep root systems to maintain green canopies during the dry season. Evergreen forests in northeastern Pará state maintain evapotranspiration during five-month dry periods by absorbing water from the soil to depths of more than 8m. In contrast, although the degraded pastures of this region also contain deep-rooted woody plants, most pasture plants substantially reduce their leaf canopy in response to seasonal drought, thus reducing dry-season evapotranspiration and increasing potential subsurface runoff relative to the forests they replace. Deep roots that extract water also provide carbon to the soil. The forest soil below 1 m depth contains more carbon than does above-ground biomass, and as much as 15% of this deep-soil carbon turns over on annual or decadal timescales. Thus, forest alteration that affects depth distributions of carbon inputs from roots may also affect net carbon storage in the soil. 650 $aAmazonia 650 $adepth 650 $aforest trees 650 $apastures 650 $aroots 650 $awater balance 650 $aBalanço Hídrico 650 $aFloresta 650 $aPastagem 650 $aPlanta 653 $aBrasil 653 $aCiclagem de carbono 653 $aCycling 653 $aEssecia florestal 653 $aForest 653 $aPlants 653 $aProfundidade da raiz 700 1 $aCARVALHO, C. R. de 700 1 $aDAVIDSON, E. A. 700 1 $aJIPP, P. H. 700 1 $aLEFEBIRE, P. A. 700 1 $aNEGREIROS, G. H. 700 1 $aSILVA, E. D. da 700 1 $aSTONE, T. A. 700 1 $aTRUMBORE, S. E. 773 $tNature$gv. 372, n. 6507, p.666-669, Dec. 1994.
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Embrapa Amazônia Oriental (CPATU) |
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Registro Completo
Biblioteca(s): |
Embrapa Florestas. |
Data corrente: |
04/03/2008 |
Data da última atualização: |
04/03/2008 |
Tipo da produção científica: |
Artigo de Divulgação na Mídia |
Autoria: |
HIGA, R. C. V.; MORA, A. L.; HIGA, A. R. |
Afiliação: |
Rosana Clara Victoria Higa, Embrapa Florestas; Admir Lopes Mora, Engenheiro Florestal; Antonio Rioyei Higa, UFPR. |
Título: |
Plantio de eucalipto na pequena propriedade rural. |
Ano de publicação: |
2007 |
Fonte/Imprenta: |
Revista de Madeira, Curitiba, v. 18, n. 107, p. 96-103, 2007. |
Idioma: |
Português |
Palavras-Chave: |
Pequena propriedade. |
Thesagro: |
Eucalipto. |
Categoria do assunto: |
-- |
Marc: |
LEADER 00437naa a2200157 a 4500 001 1312729 005 2008-03-04 008 2007 bl --- 0-- u #d 100 1 $aHIGA, R. C. V. 245 $aPlantio de eucalipto na pequena propriedade rural. 260 $c2007 650 $aEucalipto 653 $aPequena propriedade 700 1 $aMORA, A. L. 700 1 $aHIGA, A. R. 773 $tRevista de Madeira, Curitiba$gv. 18, n. 107, p. 96-103, 2007.
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Embrapa Florestas (CNPF) |
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