Data/hora: 14/06/2024 16:34:38

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 01/10/1997
Data da última atualização: | 05/04/2017
Autoria: | ANDERSON, T. H.; DOMSCH, K. H.
Título: | Determination of ecophysiological maintenance carbon requirements of soil microorganisms in a dormant state.
Ano de publicação: | 1985
Fonte/Imprenta: | Biology and Fertility of Soils, v.1, p.81-89, 1985.
Idioma: | Inglês
Conteúdo: | An experimental approach was attempted for determining the maintenance carbon requirements of the dormant microbial biomass of two agricultural soils (I, II) and one, forest soil (III). The amount of carbon needed for preventing microbial-C loss during incubation expressed as coefficient m (mg glucose-C.mg-1 biomass-C.h-1) was 0.00031, 0.00017 and 0.00017 h-1 at 28C and 0.000043, 0.000034 and 0.000016 h-1 at 15C for soils I, II and III, respectively. Depending on the temperature, the determined m values of the dormant population were two to three orders of magnitude below known values from pure cultures or m values of metabolically activated biomasses under in situ conditions. Corresponding microbial-C loss quotients were comparable to the observed maintenance coeficcients but were always above m. The metabolic quotient q for CO2 (mg CO2-C.mg-1 biomass-C.h-1) of the dormant popaulations in the three soils tested was at q = 0.0018 h-1 (22C) one order of magnitude below metabolically activated cells but did not correspond to the low maintenance values determined, which implies that in addition to possible utilization of native soil organic matter dormant biomasses must largely have an endogenously derived respiratory activity.
Palavras-Chave: | Biomass carbon loss; Dormant populations; Maintenance carbon requirements; Microorganismo; Populacao dormente.
Thesagro: | Biomassa; Solo.
Thesaurus Nal: | microbial biomass; soil.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (35048-1) - ADD - SP - PP - SP15410 -  - 15410 - DIS