Registro Completo |
Biblioteca(s): |
Embrapa Pantanal. |
Data corrente: |
28/09/1995 |
Data da última atualização: |
07/04/2017 |
Autoria: |
SPARLING, G. P.; WEST, A. W. |
Título: |
Importance of soil water content when stimating soil microbial C, N and P by the fumigation-extraction methods. |
Ano de publicação: |
1989 |
Fonte/Imprenta: |
Soil Biology Biochemistry, v.21, n.2, p.245-253, 1989. |
Idioma: |
Inglês |
Conteúdo: |
The influence of soil water content on the estimation of microbial C, N and P by the fumigation-extraction (FE) method and microbial C and N by the fumigation-incubation (FI) method was investigated using a range of air-dry soils. The estimates of microbial C were compared with those obtained by the substrate-induced respiration (SIR) method. Soils were fumigated overnight with CHCl3 when either air-dry, or rewetted to 50% w/w water content immediately before fumigation. The presence of water during fumigation greatly increased the C and N extracted by 0.5 m K2SO4, compared with soils fumigated while air-dry. Overnight rewetting of non-fumigated (control) soils decreased extractable-C but the effect on extractable-N was variable. Rewetting before fumigation also increased CO2-C production and net N-mineralization (during subsequent incubation) compared to soils fumigated while air dry. However, because of high variability the increases were often not significant. The flushes of extractable-C and N (the difference between fumigated and non-fumigated soils) were calculated in three ways. Comparison with the biomass C estimated on air-dry soils by the SIR method suggests the most appropriate way to estimate the flush is: flush = (extractable-C from wetted, fumigated soil) - (extractable-C from air-dry, non-fumigated soil). |
Thesagro: |
Solo. |
Thesaurus Nal: |
soil. |
Categoria do assunto: |
-- |
Marc: |
LEADER 01802naa a2200157 a 4500 001 1786368 005 2017-04-07 008 1989 bl --- 0-- u #d 100 1 $aSPARLING, G. P. 245 $aImportance of soil water content when stimating soil microbial C, N and P by the fumigation-extraction methods. 260 $c1989 520 $aThe influence of soil water content on the estimation of microbial C, N and P by the fumigation-extraction (FE) method and microbial C and N by the fumigation-incubation (FI) method was investigated using a range of air-dry soils. The estimates of microbial C were compared with those obtained by the substrate-induced respiration (SIR) method. Soils were fumigated overnight with CHCl3 when either air-dry, or rewetted to 50% w/w water content immediately before fumigation. The presence of water during fumigation greatly increased the C and N extracted by 0.5 m K2SO4, compared with soils fumigated while air-dry. Overnight rewetting of non-fumigated (control) soils decreased extractable-C but the effect on extractable-N was variable. Rewetting before fumigation also increased CO2-C production and net N-mineralization (during subsequent incubation) compared to soils fumigated while air dry. However, because of high variability the increases were often not significant. The flushes of extractable-C and N (the difference between fumigated and non-fumigated soils) were calculated in three ways. Comparison with the biomass C estimated on air-dry soils by the SIR method suggests the most appropriate way to estimate the flush is: flush = (extractable-C from wetted, fumigated soil) - (extractable-C from air-dry, non-fumigated soil). 650 $asoil 650 $aSolo 700 1 $aWEST, A. W. 773 $tSoil Biology Biochemistry$gv.21, n.2, p.245-253, 1989.
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Embrapa Pantanal (CPAP) |
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