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Influence of Organic Matter Decomposition on Soluble Carbon and Its Copper-Binding Capacity

Department of Plant, Soil, and Environmental Sciences, University of Maine, Orono, ME 04469

View larger version (25K): [in a new window]   Fig. 1. Scatchard distribution plots for Cu binding capacity of wheat straw– and crimson clover–derived water-extractable C showing water-extractable C extracted from soil amendments both initially and following a 7-d incubation. Filled circles = bulk extract (<0.45 µm), empty circles = low molecular weight (LMW) fraction (<1 kDa) of water-extractable C. (A) Wheat straw, Day 0; (B) wheat straw, Day 7; (C) crimson clover, Day 0; (D) crimson clover, Day 7.

View larger version (28K): [in a new window]   Fig. 2. Retention percentages for an 8-wk incubation of wheat straw and crimson clover, with retention defined as material not passing through a YM1 1000 MWCO ultrafiltration membrane. Values presented are mean values for two replicates; error bars represent one standard deviation. Circles = retention percentage for water-extractable carbon (Cws) extracted from wheat straw (filled circles) and crimson clover (empty circles). Triangles = retention percentage for Folin–Ciocalteau reactive soluble phenolic compounds (FSP) content of water-extractable C extracts from wheat straw (filled triangles) and crimson clover (empty triangles).

View larger version (18K): [in a new window]   Fig. 3. Ultraviolet spectrophotometric absorption (A; defined per mole C at 285 nm) of bulk extracts over an 8-wk incubation. Values presented are mean values for two replicates; error bars represent one standard deviation. Filled circles = wheat straw. Empty circles = crimson clover. Cws, water-extractable carbon.

View larger version (58K): [in a new window]   Fig. 4. Fluorophore changes in bulk water-extractable C extracts over a 7-d incubation. (I) Wheat straw, Day 0; (II) wheat straw, Day 7; (III) crimson clover, Day 0; (IV) crimson clover, Day 7. Contour interval on all plots = 25 relative intensity units. For a definition of Fluorophores A, B, C, and D, see the Results section.

View larger version (78K): [in a new window]   Fig. 5. Fluorophore changes in low molecular weight (LMW) (<1 kDa) fraction of water-extractable C over a 7-d incubation. (I) Wheat straw, Day 0; (II) wheat straw, Day 7; (III) crimson clover, Day 0; (IV) crimson clover, Day 7. Contour interval on all plots = 25 relative intensity units. For a definition of Fluorophores A, B, C, and D, see the Results section.