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Biodegradability of Humic Substances and Other Fractions of Decomposing Leaf Litter

Dep. of Environmental and Resource Sciences, Univ. of Nevada, Reno, NV 89557

View larger version (40K): [in a new window]   Fig. 1. Procedure used for the isolation of fractions (Qualls et al., 2003).

View larger version (26K): [in a new window]   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].

View larger version (15K): [in a new window]   Fig. 3. Cumulative 14CO2 radioactivity evolved as a percentage of total 14C glucose added to soil cores.

View larger version (22K): [in a new window]   Fig. 4. Cumulative 14CO2 radioactivity evolved in sand vs. soil cores.