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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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| Registros recuperados : 33 | |
| 2. |  | KIST, H.; MANICA, I. Densidades de plantio, crescimento e produção do mamoeiro formosa (Carica papaya L.) em Porto Lucena, RS. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 30, n. 5, p. 657-666, maio 1995. Título em inglês: Planting density, growth and production of the papaya 'formosa' (Caricica papaya L.) at Porto Lucena, RS.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 6. | | COLAUTO, N. M.; MANICA, I.; RIBOLDI, J. MIELNICZUK, J. Efeito do nitrogenio, fosforo e potassio, sobre a producao, qualidade e estado nutricional do maracujazeiro amarelo. Pesquisa Agropecuaria Brasileira, Brasilia, v.21, n.7, p.691-695, jul. 1986.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 10. | | PAIVA, M. C.; MANICA, I.; FIORAVANCO, J. C. Competição entre quatro cultivares e três seleções de goiabeira em Eldorado do Sul, RS. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 29, n. 6, p. 917-922, jun. 1994. Título em inglês: Competition among four guava cultivars and three selection in Eldorado do Sul, RS.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 11. | | KIST, H.; FELDENS, A. M.; MANICA, I.; FIORAVANÇO, J. C. Análise econômica de densidades de plantio do maracujá-amarelo no município de Porto Lucena, RS. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 31, n. 7, p. 497-502, jul. 1996. Título em inglês: Economic analysis of yellow passion fruit planting densities in Porto Lucena count, Brazil.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 13. | | MANICA, I.; FIORAVANÇO, J. C.; BARRADAS, C. I. N.; KIST, H.; VIONE, G. F. Indução do florescimento e produção do abacaxizeiro cv. Smooth Cayenne. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 29, n. 1, p. 81-86, jan. 1994. Título em inglês: Flowering induction and yield of pineapple cv. Smooth cayenne.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 15. | | FARIA, J. L. C.; COLAUTO, N. M.; MANICA, I; STRONSKI, M. dos S.; APPEL, H. B. Efecto de Tres Dosis de N,P Y K En la Producción de Maracuya Amarillo (Passiflora Edulis Sims F. Flavicarpa Deg). Pesquisa Agropecuaria Brasileira, Brasilia, v.26, n.3, p.311-314, mar.1991| Biblioteca(s): Embrapa Unidades Centrais. |
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| 16. | | MANICA, I.; CARVALHO, R. I. N. de; KIST, H.; VIONE, G. F.; BARRADAS, C. I. N. Efeito de épocas de seleção do rebento no ciclo e na produção de plantas-mães da bananeira (Musa acuminata) cultivar mysore em Porto Lucena, RS. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 30, n. 6, p. 825-829, jun. 1995. Título em inglês: Effect of selection time of suckers on the cycle and production of mother plants of banana (Musa acuminata) cv. mysore in Porto Lucena, RS.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 18. | | MANICA, I.; FIORAVANÇO, J. C.; BARRADAS, C. I. N.; KIST, H. Seis espaçamentos de plantio e produção do maracujazeiro-amarelo (Passiflora edulis f. flavicarpa Deg.) em Porto Lucena, RS. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 29, n. 7, p. 1083-1090. jul. 1994. Título em inglês: Six plant spacings and yield of the yellow passion fruit (Passiflora edulis f. flavicarpa Deg.) in Porto Lucena, RS, Brazil.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 19. | | MÂNICA, I.; PASSOS, L. P.; LUCHI, V. L.; DEFELIPO, B. V.; CONDE, A. R. efeito de três doses de cloreto e sulfato de potássio na concentração de macro-nutrientes nas folhas do abacaxizeiro (ananas comosus (L.) Merril.) cultivar Smooth Cayenne em Visconde do Rio Branco, Minas Gerais, Brasil. In: CONGRESSO BRASILEIRO DE FRUTICULTURA, 7., 1984, Florianópolis. Anais.... Florianópolis: Sociedade Brasileira de Fruticultura; EMPASC, 1984.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Uva e Vinho. |
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| 20. | | MANICA, I.; FIORAVACO, J. C.; BARRADAS, C. I. N.; KIST, H. G. K.; KIST, H. Efeito de seis espaçamentos de plantio em 4 anos de produção do maracujazeiro-amarelo em Porto Lucena, RS. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 29, n. 11, p. 1715-1722, nov. 1994. Título em inglês: Effect of six plant spacings four-year production of the yellow passion fruit in Porto Lucena, RS, Brazil.| Biblioteca(s): Embrapa Unidades Centrais. |
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| Registros recuperados : 33 | |
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