Data/hora: 25/06/2024 07:18:04

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 21/07/2005
Data da última atualização: | 13/03/2017
Autoria: | RICHEY, J. E.; HEDGES, J. I.; DEVOL, A. H.; QUAY, P. D.; VICTORIA, R.; MARTINELLI, L.; FORSBERG, B. R.
Afiliação: | School of Oceanography and Quaternary Research Center, University of Washington; Esalq-Piracicaba; Centro de Energia Nuclear na Agricultura (Piracicaba); Instituto Nacional de Pesquisa da Amazônia.
Título: | Biogeochemistry of carbon in the Amazon river.
Ano de publicação: | 1990
Fonte/Imprenta: | Limnology and Oceanography, v. 35, n. 2, p. 352-371, 1990.
Idioma: | Inglês
Conteúdo: | Depth-integrated, discharge-weighted water samples were collected over 1,800 km of the Amazon River on eight cruises at different stages of the hudrograph, 1982-1984. Fine (FPOC, <63 um) particulate organic carbon as weight percentage of suspended sediment varied between 0.9-1.5% for FPOC and 0.5-3.4% for CPOC. Concentrations of FPOC ranged from 5 mg liter-1 upriver to 2 mg liter-1 dow river in the mainstem and from 6 mg liter-1 in the Rio Madeira to <1 in the Rio negro. CPOC had similar distribution patterns, but with concentrations 15-30% those of FPOC. Dissolved organic carbon (DOC) averaged 4-6 mg liter-1 in the mainstem and up to 12 mg liter -1 in the Rio Negro. Upriver dissolved inorganic carbon (DIC) concentrations of about 1,200 uM were diluted by tributaries and floodplain drainage to 600 uM at the most downriver site. Evasion of CO2, invasion of Os, and in situ oxidation were comparable magnitude, 3-8 umo m-2 s-1. The average export of total organic carbon (TOC) was 36.1 Tg yr-1 (8.5 g m-2 yr-1), of which 62% was DOC, 34% was FPOC, and 4% was CPOC. TOC inputs were insufficient to support in sito oxidation by a factor of at least two. A relatively small, rapidly cycling pool of labile organic matter may coexist with a much larger pooll of more reflactory material.
Palavras-Chave: | Brasil; Rio Amazonas.
Thesagro: | Carbono.
Thesaurus Nal: | Amazon River; Brazil; carbon.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (54599-1) - ADD - SP - PP - SP16629 -  - 16629 - DIS