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Role of Mineral-Nitrogen in Residue Decomposition and Stable Soil Organic Matter Formation

^a Dep. Plant Sciences, Univ. of California, Davis, CA 95616
^b Dep. of Land, Air and Water Resources, Univ. of California, Davis, CA 95616

View larger version (27K): [in a new window]   Fig. 1. Cumulative total, residue-, and soil-derived CO2–C for a 90-d incubation of treatments with 13C-labeled residue with or without mineral-N addition.

View larger version (18K): [in a new window]   Fig. 2. Percentage of recovery of added residue-C in soil organic matter fractions or as respired CO2–C after a 90-d incubation of 13C15N-labeled residue with or without mineral-N addition. (Statistical differences found using Tukey's Studentized Range Test for P < 0.05)

View larger version (46K): [in a new window]   Fig. 3. Fate of mineral-15N, residue-15N, or original soil-N redistributed among organic matter fractions after a 90-d incubation. Standard errors shown are for total N in each fraction. Bars with the same uppercase letter within each fraction denote that total N is not significantly different. Means separation for N derived from mineral-N additions and residue-derived N is described in Table 1.

View larger version (33K): [in a new window]   Fig. 4. Incorporation of N into organic matter fractions and as inorganic N from added residue-15N or mineral-15N after a 90-d incubation. Bars with same letter within an organic matter fraction are not significantly different.

View larger version (27K): [in a new window]   Fig. 5. Incorporation of N from a 15N-labeled source into the stable humin fraction after a 90-d incubation of soils amended with residue or mineral-N. Lowercase letters inside the bars denote that the new N derived from the indicated source is not significantly different at P < 0.05.