Data/hora: 15/06/2024 20:37:20

Provedor de dados: | 36
País: | Brazil
Título: | Changes in the amount of soluble carbohydrates and polyphenols contents during decomposition of Montrichardia arborescens (L.) Schott
Autores: | Cunha-Santino,Marcela Bianchessi da; Pacobahyba,Lucilia Dias; Bianchini Jr,Irineu.
Data: | 2003-01-01
Ano: | 2003
Palavras-chave: | Carbohydrates; Polyphenols; Aerobic and anaerobic decomposition; Montrichardia arborescens.
Resumo: | This study describes the aerobic and anaerobic decay of soluble carbohydrates (CH) and polyphenols (PH) during decomposition of Montrichardia arborescens. Plant and water samples were collected in the Cantá stream (2º 49' 11" N and 60º 40' 24" W), Roraima, Brazil. Decomposition chambers with plant fragments and stream water were incubated. Particulate organic matter was separated from dissolved organic matter and concentrations of CH and PH were determined. The results were fitted to 1st order kinetics models. CH and PH comprised a labile fraction (LCH and LPH) and a refractory fraction (RCH and RPH). The global coefficient associated with LCH weight loss was 1.4 times higher under aerobic conditions (3.4 day-1) higher than for anaerobic conditions. On the other hand, the RCH decay rate in the anaerobic process (0.0074 day-1) was 1.39 times higher. LCH was estimated to be 92% while RCH amounted to 8%. The LPH anaerobic decay was 5.2 times the value for the aerobic decay (0.67 day-1). For both conditions, RPH decay coefficients were similar (» 0.011 day-1). In the aerobic experiments LPH and RPH corresponded to 92.5% and 7.5%, respectively. For the anaerobic process these contents were 85.5% and 14.5%, respectively. From these results, we concluded that in the Cantá stream, the anaerobic degradation of phenols is more efficient than the aerobic counterpart. The aerobic condition provides a faster decay of carbohydrates of this plant.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672003000300011
Editor: | Instituto Nacional de Pesquisas da Amazônia
Relação: | 10.1590/S0044-59672003000300011
Formato: | text/html
Fonte: | Acta Amazonica  v.33 n.3 2003
Fonte: | info:eu-repo/semantics/openAccess