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Fig. 2. Cumulative ¹⁴CO₂ radioactivity evolved as a percentage of total ¹⁴C added to soil cores in various fractions of NaOH extract of decomposed litter. The means of the following fractions with the same letters (a–e) were not significantly different: humic acid (a), fulvic acid (b), phenolic (b,c), litter (c), hydrophilic acid (c,d), hydrophilic neutral (d,e), humin (e). The lines represent the fit of the data to Eq. [1].