Influence of site, management and treatment on active (<i>C</i><sub>a</sub>) and slow (<i>C</i><sub>s</sub>) carbon pool sizes and their decomposition rate constants (<i>k</i><sub>a</sub>, <i>k</i><sub>s</sub>, respectively).
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All coefficients were estimated by modeling Ct = Ca (1-e–ka t)+ Cs (1-e–ks t) using cumulative CO2 emission data. Results are means ± standard deviation for unamend control soils (Control) and all treatments (All trts). Control: treatments with no residue or N fertilizer added. N: treatments with N fertilization. R: treatments with residue application. RN: treatments applied with both residue and N fertilizer. “Control, N” and “R, RN” represent the treatments without or with residue addition respectively; “Control, R” and “N, RN” represent the treatments without or with N fertilization respectively. Grand mean comparisons between sites were made with controls, values not followed by the same upper case letter differ at p<0.05. Means comparisons within each site were made within treatment groups, i.e. cropping system (Conv, Med, Long), residue addition (“Control, N”, “R, RN”), N fertilization (“Control, R”, “N, RN”), values not followed by the same lower case letter differ at p<0.05.
