Data/hora: 08/06/2024 02:09:38

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 15/02/1995
Data da última atualização: | 26/03/2015
Autoria: | HAMILTON, S. K.; SIPPEL, S. J.; MELACK, J. M.
Afiliação: | University of California. Department of Biological Sciences and Marine Science Institute (Santa Barbara, CA).
Título: | Methane emission from tropical wetlands: the relative importance of ebullition and plant-mediated transport.
Ano de publicação: | 1994
Fonte/Imprenta: | [S.l: s.n.], 1994.
Páginas: | 11p.
Idioma: | Inglês
Notas: | Preparado para Limnology and Oceanography.
Conteúdo: | Measurements of the composition of sediment gas bubbles and of methane emission from emergent plants in the Pantanal wetland of Brazil indicate that savanna floodplains with inundation depths > 1 m have high rates of methane emission by ebullition compared with emission by rooted emergent plants. High rates of methane production and ebullition result in high concentrations of methane in sediment bubbles, which often contained > 50% methane by volume at the deeper ( > 1m) sampling sites. The rooted emergent plants typical of the deeper waters had low rates of methane emission (0.0-0.2 mg/d) compared to species typical of inundation depths < 1m (1.6-7.5 mg/d). The high rates of ebullition in the deeper vegetated waters of the Pantanal contrast with results from shallower rice fields and temperate wetlands,in which plant-mediated transport appears to be the dominant mode of methane emission. The elongated stems of rooted emergent plants tend to predominate in tropical wetlands with inundation depths > 1m are evidently much less effective in the transport of methane from the sediments to the atmosphere than are the emergent stems of plants that grow in shallower waters.
Palavras-Chave: | Gas metano; Plant; Sediment; Wetland.
Thesagro: | Água; Planta; Sedimento.
Thesaurus Nal: | methane; Pantanal; water.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (27703-1) - ADD - FL - PP - FL2819 -  - 2819 - DIS