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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
18/10/1995 |
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Data da última atualização: |
07/04/2017 |
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Autoria: |
ROSS, D. J. |
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Título: |
Estimation of soil microbial C by a fumigation-extraction method: influence of seasons soils and calibration with the fumigation-incubation procedure. |
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Ano de publicação: |
1990 |
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Fonte/Imprenta: |
Soil Biology Biochemistry, v.22, n.3, p.295-300, 1990. |
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Idioma: |
Inglês |
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Conteúdo: |
Exctractable-C in soils from perennial grassland was measured by an extraction method using 0.5 mK2SO4. In fresh, unfumigated samples taken at different seasons, extractable-C contents were related positively to the field-moiusture content of each soil. In contrast, values of extractable-C flush, viz. the difference between the amounts of C extracted from chloroform-fumigated and unfumigated soil, were generally highest in the driest, summer or autumn samples. Extractable-C flush was converted to microbial biomass C by calibration with the fumigation-incubation procedure, to obtain kec factors. Various modifications of the incubation procedure were investigated and had a marked effect on kec values; the use of a small inoculum and fumigated control appeared the most satisfactory procedure for calculating microbial C, for fresh and pre-incubated samples. The mean kec value of seven soils was then ca 0.33 with a SD of 0.07. The kec values of individual soils varied with season of sampling and were generally highest in autumn. Variation of kec values amongst the different soils were, however, appreaciably greater. Some limitations of the fumigation-extraction method and of the use of a common kec-factor for different soils are discussed. Preliminary calibration of extractable-C flush values, for conversion to microbial biomass C content, is recommended for detailed studies of an individual soil. |
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Thesagro: |
Bioquímica; Solo. |
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Thesaurus Nal: |
biochemistry; soil. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01940naa a2200169 a 4500
001 1786530
005 2017-04-07
008 1990 bl --- 0-- u #d
100 1 $aROSS, D. J.
245 $aEstimation of soil microbial C by a fumigation-extraction method$binfluence of seasons soils and calibration with the fumigation-incubation procedure.
260 $c1990
520 $aExctractable-C in soils from perennial grassland was measured by an extraction method using 0.5 mK2SO4. In fresh, unfumigated samples taken at different seasons, extractable-C contents were related positively to the field-moiusture content of each soil. In contrast, values of extractable-C flush, viz. the difference between the amounts of C extracted from chloroform-fumigated and unfumigated soil, were generally highest in the driest, summer or autumn samples. Extractable-C flush was converted to microbial biomass C by calibration with the fumigation-incubation procedure, to obtain kec factors. Various modifications of the incubation procedure were investigated and had a marked effect on kec values; the use of a small inoculum and fumigated control appeared the most satisfactory procedure for calculating microbial C, for fresh and pre-incubated samples. The mean kec value of seven soils was then ca 0.33 with a SD of 0.07. The kec values of individual soils varied with season of sampling and were generally highest in autumn. Variation of kec values amongst the different soils were, however, appreaciably greater. Some limitations of the fumigation-extraction method and of the use of a common kec-factor for different soils are discussed. Preliminary calibration of extractable-C flush values, for conversion to microbial biomass C content, is recommended for detailed studies of an individual soil.
650 $abiochemistry
650 $asoil
650 $aBioquímica
650 $aSolo
773 $tSoil Biology Biochemistry$gv.22, n.3, p.295-300, 1990.
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Embrapa Pantanal (CPAP) |
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