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Ergosterol and microbial biomass relationship in soil

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Abstract

Ergosterol and microbial biomass C were measured in 26 arable, 16 grassland and 30 forest soils. The ergosterol content ranged from 0.75 to 12.94 μg g-1 soil. The geometric mean ergosterol content of grassland and forest soils was around 5.5 μg g-1, that of the arable soils 2.14 μg g-1. The ergosterol was significantly correlated with biomass C in the entire group of soils, but not in the subgroups of grassland and forest soils. The geometric mean of the ergosterol: microbial biomass C ratio was 6.0 mg g-1, increasing in the order grassland (5.1), arable land (5.4) and woodland (7.2). The ergosterol:microbial biomass C ratio had a strong negative relationship with the decreasing cation exchange capacity and soil pH, indicating that the fungal part of the total microbial biomass in soils increased when the buffer capacity decreased. The average ergosterol concentration calculated from literature data was 5.1 mg g-1 fungal dry weight. Assuming that fungi contain 46% C, the conversion factor from micrograms ergosterol to micrograms fungal biomass C is 90. For soil samples, neither saponification of the extract nor the more effective direct saponification during extraction seems to be really necessary.

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Authors and Affiliations

  1. Institut für Bodenwissenschaften, Universität Göttingen, von-Siebold-Strasse 4, D-37075, Göttingen, Germany

    G. Djajakirana, R. G. Joergensen & B. Meyer

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  1. G. Djajakirana
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  2. R. G. Joergensen
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  3. B. Meyer
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Djajakirana, G., Joergensen, R.G. & Meyer, B. Ergosterol and microbial biomass relationship in soil. Biol Fertil Soils 22, 299–304 (1996). https://doi.org/10.1007/BF00334573

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