Fig. 2. Relationship between the biomass C to total C (Cmic to Corg) ratio and alkyl-C to O-alkyl-C ratio for soils from Table 1 (closed symbols) and from Beyer (1995) and Beyer et al. (1995) (open symbols). (
) urban soils, (
) mineral soils, (
) organic soils (Beyer, 1995; Beyer et al., 1995)