Abstract
The fumigation-extraction (FE) method, applied after extraction of inorganic N and sieving was used to measure soil microbial biomass C, N and carbohydrate C contents at a depth of 0–10 cm under wheat every week in a field study lasting from October 1990 to November 1991. A minimum of 180 μg microbial biomass Cg −1 soil and a maximum of 363 μg g −1 were recorded, the corresponding values for biomass N being 35μg g −1 soil (= 53 kg ha −1) and 66μg g −1 soil (= 99 kg ha −1). An increase was observed from December 1990 to November 1992, with minor fluctuations during periods with strong variations in weather conditions: cold and very wet in winter, extremely dry in summer. All three biomass components measured in the 0.5 M K 2SO 4 extracts of the FE procedure were significantly correlated. The intercepts of the linear relationships between microbial biomass C, N and carbohydrate C were non-significant, indicating constant component ratios. The amount of carbon additionally made extractable by fumigation consisted of 17% carbohydrate C. The biomass C:N ratio fluctuated closely around a mean value of 5.5.
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