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Registro Completo |
Biblioteca(s): |
Embrapa Meio Norte / UEP-Parnaíba. |
Data corrente: |
13/12/1995 |
Data da última atualização: |
13/12/1995 |
Autoria: |
WU, J.; O'DONNELL, A. G.; HE, Z. L; SYERS, J. K. |
Título: |
Fumigation-extraction method for the measurement of soil microbial biomass-S. |
Ano de publicação: |
1994 |
Fonte/Imprenta: |
Soil Biology and Biochemistry, v.26, n.1, p.117-125, 1994. |
Idioma: |
Inglês |
Conteúdo: |
Fumigation-extraction was evaluated for the measurement of microbial biomass-S in soil. Following fumigation in CHCl3, S was extracted using 10 mM CaCl2 at a soil-to-extractant ratio of 1-to-2 (w/v). These conditions were shown to be favourable in a range of soils containing extractable-S below 30 mg S g-1 soil. Extractable-S was measured by ion chromatography following H2O2 digestion. The increase in extractable-S following fumigation (the flush) was converted to biomass-S using a conversion factor (Ks) determined using 35S-labelled biomass-S. Using a soil-to-extractant ratio of 1-to-2 gave a value for Ks of 0.31. This methodology was shown to be reliable for soils subject to arable, grassland or woodland management, with pH values above 3.7 and claycontents of 4-60%. The amounts of biomass-S measured in these soils were in the range 2.9-20 mg S g-1 soil. The data also showed that the amounts of biomass-S in soil are related to biomass-C and dependant upon soil management and fertilisation. |
Palavras-Chave: |
Biomassa microbiana; Cloroformio; Grassland; Sulphur. |
Thesagro: |
Enxofre; Fumigação; Pastagem. |
Thesaurus Nal: |
chloroform; fumigation; microbial biomass. |
Categoria do assunto: |
-- |
Marc: |
LEADER 01724naa a2200277 a 4500 001 1075440 005 1995-12-13 008 1994 bl --- 0-- u #d 100 1 $aWU, J. 245 $aFumigation-extraction method for the measurement of soil microbial biomass-S. 260 $c1994 520 $aFumigation-extraction was evaluated for the measurement of microbial biomass-S in soil. Following fumigation in CHCl3, S was extracted using 10 mM CaCl2 at a soil-to-extractant ratio of 1-to-2 (w/v). These conditions were shown to be favourable in a range of soils containing extractable-S below 30 mg S g-1 soil. Extractable-S was measured by ion chromatography following H2O2 digestion. The increase in extractable-S following fumigation (the flush) was converted to biomass-S using a conversion factor (Ks) determined using 35S-labelled biomass-S. Using a soil-to-extractant ratio of 1-to-2 gave a value for Ks of 0.31. This methodology was shown to be reliable for soils subject to arable, grassland or woodland management, with pH values above 3.7 and claycontents of 4-60%. The amounts of biomass-S measured in these soils were in the range 2.9-20 mg S g-1 soil. The data also showed that the amounts of biomass-S in soil are related to biomass-C and dependant upon soil management and fertilisation. 650 $achloroform 650 $afumigation 650 $amicrobial biomass 650 $aEnxofre 650 $aFumigação 650 $aPastagem 653 $aBiomassa microbiana 653 $aCloroformio 653 $aGrassland 653 $aSulphur 700 1 $aO'DONNELL, A. G. 700 1 $aHE, Z. L 700 1 $aSYERS, J. K. 773 $tSoil Biology and Biochemistry$gv.26, n.1, p.117-125, 1994.
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