Journal
SOIL BIOLOGY & BIOCHEMISTRY
Volume 32, Issue 6, Pages 879-882Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0038-0717(99)00210-2
Keywords
soil microbial biomass; DNA; ergosterol
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We evaluated the relationship between dsDNA and microbial biomass C estimated by chloroform fumigation in eight soils from the Ultuna long-term experiment (37% clay, 41% silt and 22% sand). These soils have received different organic amendments and fertilisers, every other year since 1956, which have resulted in different soil C contents and pH. Chloroform-labile C and dsDNA concentrations ranged from 50 to 208 mu g and from 24 to 95 mu g g(-1) of soil, respectively. Soil concentrations of dsDNA and chloroform-labile C were highly correlated (r = 0.96). The ratios of ergosterol to chloroform-labile C and ergosterol to dsDNA varied between the soils, indicating differences in the fungal-to-total biomass ratio. Despite differences in microbial community composition, the concentration of dsDNA was generally proportional to the concentration of chloroform-labile C and the two appeared to be equivalent measures of soil microbial biomass. (C) 2000 Elsevier Science Ltd. All rights reserved.
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