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Influence of Decomposition on Chemical Properties of Plant- and Manure-Derived Dissolved Organic Matter and Sorption to Goethite

^a Dep. of Plant, Soil, and Environmental Sciences, Univ. of Maine, 5722 Deering Hall, Orono, ME 04469-5722, U.S.A.
^b USDA-ARS, New England Plant, Soil, and Water Lab., Orono, ME 04469

View larger version (34K): [in this window] [in a new window]   Fig. 1. Water-soluble carbon content of the hydrophilic (HPL) and hydrophobic (HPB) fractions of eight plant and two animal manure residues before incubation (left bar) and after (right bar) a 10-d incubation with microbial inoculation. *, **, and *** designate significant difference between the fresh and decomposed total C content at the p = 0.05, 0.01, and 0.001 levels using the student's t test. NS indicates that the mean difference is not significant.

View larger version (29K): [in this window] [in a new window]   Fig. 2. The carboxyl and phenolic acid content of the hydrophilic and hydrophobic DOM fractions of the plant biomass- and animal manure-derived DOM before (left bar) and after decomposition (right bar). *, **, and *** designate significant difference between the fresh and decomposed total acidity content at the p = 0.05, 0.01, and 0.001 levels using the student's t test. NS indicates that the mean difference is not significant.

View larger version (27K): [in this window] [in a new window]   Fig. 3. The sorption onto goethite of 60 mg C L–1 solutions of the hydrophilic and hydrophobic DOM fractions of the plant biomass- and animal manure-derived DOM before and after decomposition. Error bars indicate standard deviation of the mean of three replicates. *, **, and *** designate significant difference at the p = 0.05, 0.01, and 0.001 levels using the student's t test between the fresh and decomposed means. NS indicates that the mean difference is not significant.