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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
28/09/1995 |
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Data da última atualização: |
07/04/2017 |
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Autoria: |
DIAZ-RAVINA, T.; CARBALLAS, T.; ACEA, M. J. |
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Título: |
Microbial biomass and metabolic activity in four acid soils. |
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Ano de publicação: |
1988 |
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Fonte/Imprenta: |
Soil Biology Biochemistry, v.20, n.6, p.817-823, 1988. |
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Idioma: |
Inglês |
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Conteúdo: |
The fumigation method was used to estimate microbial biomass C in four Haplumbrepts developed over different kinds of rock. In order to investigate the relationship between metabolic activity and microbial biomass and population density, CO2 release from the flucose-enriched and unenriched soils was measured during 28 days of incubation. Biomass C levels lay between 36 and 112 mg 100 g-1 of dry soil, and made up only a small proportion of total soil C (0.77-1.38%). Only a small fraction of this biomass was detected by counting viables, but the microbial population was nevertheles significantly correlated with the biomass determined by fumigation. Among the phyco-chemical properties of the soils, microbial biomass and population size were both chiefly affected (favourably) by humidity, total C and N and Al gel content. Metabolic activity was slight, either because part of the micro-organisms are inactive or because of a limited supply of substrate (the organic matter present may be unsuitable as a substrate or protected from microbial attack). Percentage C mineralization was inversely related to organic matter, silt and Al gel contents and likewise failed to exhibit positive correlation with respiration, the biomass determined by fumigation or the counted population. The metabolic activity of the biomass appeared to depend upon the quality and nature of soil organic matter rather than its quantity, which nevertheless controlled microbial population size. Neither microbial biomass estimates nor viable population counts faithfully metabolic activity in the soils. MenosThe fumigation method was used to estimate microbial biomass C in four Haplumbrepts developed over different kinds of rock. In order to investigate the relationship between metabolic activity and microbial biomass and population density, CO2 release from the flucose-enriched and unenriched soils was measured during 28 days of incubation. Biomass C levels lay between 36 and 112 mg 100 g-1 of dry soil, and made up only a small proportion of total soil C (0.77-1.38%). Only a small fraction of this biomass was detected by counting viables, but the microbial population was nevertheles significantly correlated with the biomass determined by fumigation. Among the phyco-chemical properties of the soils, microbial biomass and population size were both chiefly affected (favourably) by humidity, total C and N and Al gel content. Metabolic activity was slight, either because part of the micro-organisms are inactive or because of a limited supply of substrate (the organic matter present may be unsuitable as a substrate or protected from microbial attack). Percentage C mineralization was inversely related to organic matter, silt and Al gel contents and likewise failed to exhibit positive correlation with respiration, the biomass determined by fumigation or the counted population. The metabolic activity of the biomass appeared to depend upon the quality and nature of soil organic matter rather than its quantity, which nevertheless controlled microbial population size. Neither microbial bio... Mostrar Tudo |
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Thesagro: |
Solo. |
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Thesaurus Nal: |
soil. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02026naa a2200169 a 4500
001 1786372
005 2017-04-07
008 1988 bl --- 0-- u #d
100 1 $aDIAZ-RAVINA, T.
245 $aMicrobial biomass and metabolic activity in four acid soils.
260 $c1988
520 $aThe fumigation method was used to estimate microbial biomass C in four Haplumbrepts developed over different kinds of rock. In order to investigate the relationship between metabolic activity and microbial biomass and population density, CO2 release from the flucose-enriched and unenriched soils was measured during 28 days of incubation. Biomass C levels lay between 36 and 112 mg 100 g-1 of dry soil, and made up only a small proportion of total soil C (0.77-1.38%). Only a small fraction of this biomass was detected by counting viables, but the microbial population was nevertheles significantly correlated with the biomass determined by fumigation. Among the phyco-chemical properties of the soils, microbial biomass and population size were both chiefly affected (favourably) by humidity, total C and N and Al gel content. Metabolic activity was slight, either because part of the micro-organisms are inactive or because of a limited supply of substrate (the organic matter present may be unsuitable as a substrate or protected from microbial attack). Percentage C mineralization was inversely related to organic matter, silt and Al gel contents and likewise failed to exhibit positive correlation with respiration, the biomass determined by fumigation or the counted population. The metabolic activity of the biomass appeared to depend upon the quality and nature of soil organic matter rather than its quantity, which nevertheless controlled microbial population size. Neither microbial biomass estimates nor viable population counts faithfully metabolic activity in the soils.
650 $asoil
650 $aSolo
700 1 $aCARBALLAS, T.
700 1 $aACEA, M. J.
773 $tSoil Biology Biochemistry$gv.20, n.6, p.817-823, 1988.
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Embrapa Pantanal (CPAP) |
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