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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. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
02/03/2011 |
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Data da última atualização: |
11/11/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
DAVIDSON, E. A.; FIGUEIREDO, R. O.; MARKEWITZ, D.; AUFDENKAMPE, A. K. |
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Afiliação: |
ERIC A. DAVIDSON, WOODS HOLE RESEARCH CENTER; RICARDO DE OLIVEIRA FIGUEIREDO, CPATU; DANIEL MARKEWITZ, UNIVERSITY OF GEORGIA; ANTHONY K. AUFDENKAMPE, STROUD WATER RESEARCH CENTER. |
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Título: |
Dissolved CO2 in small catchment streams of eastern Amazonia: A minor pathway of terrestrial carbon loss. |
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Ano de publicação: |
2010 |
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Fonte/Imprenta: |
Journal of Geophysical Research, v. 115, G04005, 2010. |
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DOI: |
10.1029/2009JG001202 |
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Idioma: |
Inglês |
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Conteúdo: |
Production of carbon dioxide (CO2) in soils can lead to supersaturation of dissolved free CO2 (pCO2) in groundwater, which later evades to the atmosphere as groundwater enters streams and rivers. This process could be a significant pathway for return of terrestrially fixed C to the atmosphere. We measured pCO2 monthly over two years at multiple stations along three streams from their headwaters in remnant mature forests through multiple land covers in Pará, Brazil. The pCO2 averaged 19,000 μatm in headwaters and decreased to about 4,500 μatm downstream. Similar values were measured in headwaters of two small pristine mature forest catchments. Two approaches were used to estimate groundwater pCO2 evasion: assuming that headwater pCO2 measurements reflected incoming groundwater pCO2 or that all entering stream water was in equilibrium with previously measured deep soil CO2. With these assumptions, losses from the terrestrial environment through aquatic evasion of pCO2 would be 0.02-0.15 Mg C ha‑1 of land area yr‑1, which is about 2-3 orders of magnitude lower than annual estimates of soil respiration and net primary productivity. However, downstream pCO2 values that appear to be in quasi-steady state indicate contributions from other C sources, such as aquatic primary production, soil erosion, dissolved organic matter, or litter inputs from streamside vegetation. Hence, lateral pCO2 loss from groundwater to streams is minor for most of the terrestrial ecosystems of this region, although C loss to streams could be significant for net terrestrial budgets in riparian ecosystems or areas experiencing erosion. MenosProduction of carbon dioxide (CO2) in soils can lead to supersaturation of dissolved free CO2 (pCO2) in groundwater, which later evades to the atmosphere as groundwater enters streams and rivers. This process could be a significant pathway for return of terrestrially fixed C to the atmosphere. We measured pCO2 monthly over two years at multiple stations along three streams from their headwaters in remnant mature forests through multiple land covers in Pará, Brazil. The pCO2 averaged 19,000 μatm in headwaters and decreased to about 4,500 μatm downstream. Similar values were measured in headwaters of two small pristine mature forest catchments. Two approaches were used to estimate groundwater pCO2 evasion: assuming that headwater pCO2 measurements reflected incoming groundwater pCO2 or that all entering stream water was in equilibrium with previously measured deep soil CO2. With these assumptions, losses from the terrestrial environment through aquatic evasion of pCO2 would be 0.02-0.15 Mg C ha‑1 of land area yr‑1, which is about 2-3 orders of magnitude lower than annual estimates of soil respiration and net primary productivity. However, downstream pCO2 values that appear to be in quasi-steady state indicate contributions from other C sources, such as aquatic primary production, soil erosion, dissolved organic matter, or litter inputs from streamside vegetation. Hence, lateral pCO2 loss from groundwater to streams is minor for most of the terrestrial eco... Mostrar Tudo |
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Palavras-Chave: |
Perda de carbono. |
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Thesaurus Nal: |
Amazonia. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02260naa a2200193 a 4500
001 1879837
005 2022-11-11
008 2010 bl uuuu u00u1 u #d
024 7 $a10.1029/2009JG001202$2DOI
100 1 $aDAVIDSON, E. A.
245 $aDissolved CO2 in small catchment streams of eastern Amazonia$bA minor pathway of terrestrial carbon loss.$h[electronic resource]
260 $c2010
520 $aProduction of carbon dioxide (CO2) in soils can lead to supersaturation of dissolved free CO2 (pCO2) in groundwater, which later evades to the atmosphere as groundwater enters streams and rivers. This process could be a significant pathway for return of terrestrially fixed C to the atmosphere. We measured pCO2 monthly over two years at multiple stations along three streams from their headwaters in remnant mature forests through multiple land covers in Pará, Brazil. The pCO2 averaged 19,000 μatm in headwaters and decreased to about 4,500 μatm downstream. Similar values were measured in headwaters of two small pristine mature forest catchments. Two approaches were used to estimate groundwater pCO2 evasion: assuming that headwater pCO2 measurements reflected incoming groundwater pCO2 or that all entering stream water was in equilibrium with previously measured deep soil CO2. With these assumptions, losses from the terrestrial environment through aquatic evasion of pCO2 would be 0.02-0.15 Mg C ha‑1 of land area yr‑1, which is about 2-3 orders of magnitude lower than annual estimates of soil respiration and net primary productivity. However, downstream pCO2 values that appear to be in quasi-steady state indicate contributions from other C sources, such as aquatic primary production, soil erosion, dissolved organic matter, or litter inputs from streamside vegetation. Hence, lateral pCO2 loss from groundwater to streams is minor for most of the terrestrial ecosystems of this region, although C loss to streams could be significant for net terrestrial budgets in riparian ecosystems or areas experiencing erosion.
650 $aAmazonia
653 $aPerda de carbono
700 1 $aFIGUEIREDO, R. O.
700 1 $aMARKEWITZ, D.
700 1 $aAUFDENKAMPE, A. K.
773 $tJournal of Geophysical Research$gv. 115, G04005, 2010.
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Registro original: |
Embrapa Amazônia Oriental (CPATU) |
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Registro Completo
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Biblioteca(s): |
Embrapa Clima Temperado. |
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Data corrente: |
17/02/2023 |
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Data da última atualização: |
17/02/2023 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
ZABALETA, J. P. L.; NUNES, J. K.; ANCIUTI, M. A.; GENTILINI, F. P.; CASTRO, L. A. S. de; GONÇALVES, M. DE C. |
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Afiliação: |
JOAO PEDRO LLANOS ZABALETA, CPACT; JULIANA KLUG NUNES, UNIVERSIDADE FEDERAL DE PELOTAS; MARCOS ANTÔNIO ANCIUTI, CONJUNTO AGROTÉCNICO VISCONDE DA GRAÇA / UFPEL; FABIANE P. GENTILINI; LUIS ANTONIO SUITA DE CASTRO, CPACT; MANOELA DE CASTRO GONÇALVES. |
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Título: |
Quantificação das perdas de raízes de batata-doce (Ipomoea batatas L.), visando seu aproveitamento na composição de rações para criação de aves orgânicas. |
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Ano de publicação: |
2010 |
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Fonte/Imprenta: |
In: SIMPOSIO INTERNACIONAL DE AGRICULTURA ORGÁNICA, 3., 2010, Chillán. [Chillán: INIA Quilamapu , 2010]. 1 CD-ROM. |
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Idioma: |
Português |
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Conteúdo: |
Um limitante ao desenvolvimento da avicultura orgânica, como outras atividades na pecuária orgânica, tem sido a escassez e custo elevado de milho e soja orgânicos, componentes normalmente básicos de rações e responsáveis respectivamente, pelo fornecimento de energia e proteína. Uma alternativa, especialmente para a avicultura na agricultura familiar, nos sistemas colonial e orgânico, é o aproveitamento de raízes de batata-doce, processadas na forma de farelo e compondo rações balanceadas, como fornecedores de energia. |
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Thesagro: |
Avicultura; Batata Doce; Nutrição Animal. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1151850/1/Zabaleta-41-POSTER-3er-Simp-Agr-Chile-2010.pdf
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Marc: |
LEADER 01310nam a2200205 a 4500
001 2151850
005 2023-02-17
008 2010 bl uuuu u00u1 u #d
100 1 $aZABALETA, J. P. L.
245 $aQuantificação das perdas de raízes de batata-doce (Ipomoea batatas L.), visando seu aproveitamento na composição de rações para criação de aves orgânicas.$h[electronic resource]
260 $aIn: SIMPOSIO INTERNACIONAL DE AGRICULTURA ORGÁNICA, 3., 2010, Chillán. [Chillán: INIA Quilamapu , 2010]. 1 CD-ROM.$c2010
520 $aUm limitante ao desenvolvimento da avicultura orgânica, como outras atividades na pecuária orgânica, tem sido a escassez e custo elevado de milho e soja orgânicos, componentes normalmente básicos de rações e responsáveis respectivamente, pelo fornecimento de energia e proteína. Uma alternativa, especialmente para a avicultura na agricultura familiar, nos sistemas colonial e orgânico, é o aproveitamento de raízes de batata-doce, processadas na forma de farelo e compondo rações balanceadas, como fornecedores de energia.
650 $aAvicultura
650 $aBatata Doce
650 $aNutrição Animal
700 1 $aNUNES, J. K.
700 1 $aANCIUTI, M. A.
700 1 $aGENTILINI, F. P.
700 1 $aCASTRO, L. A. S. de
700 1 $aGONÇALVES, M. DE C.
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