Table 1.
Summary of the management, inherent and dynamic soil properties at Marsden and the Farming Systems Project.
Figure 1.
Cumulative CO2-C release from the IAsoil and the MDsoil after 330 days incubation.
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. Different letters above bars suggest significant differences at p<0.05, comparisons were made for the interaction of cropping system (Conv, Med, Long) by treatments (Control, N, R, RN) within each site (IAsoil, MDsoil).
Table 2.
Influence of site, management and treatment on active (Ca) and slow (Cs) carbon pool sizes and their decomposition rate constants (ka, ks, respectively).
Figure 2.
Amount and percentage of SOC loss comparing with initial SOC content.
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. Different letters above the bar suggest significant differences at p<0.05, comparisons were performed in different treatments within each site (IAsoil, MDsoil).
Figure 3.
Effect of cropping system and treatment on occluded POM-C (OPOM-C) dynamics during 330 day incubation.
Control: treatments with no residue nor N fertilizer added. N: treatments with N fertilized, R: treatments with residue applied. RN: treatments with both residue and N fertilizer added. Different letters suggest significant differences at p<0.05, comparisons were were made for the interaction of cropping system (Conv, Med, Long) by date (0, 180, 330 days), and treatments (Control, N, R, RN) by date within each site (IAsoil, MDsoil).
Figure 4.
Interactions between residue addition and cropping system or N fertilization on C mineralization coefficients.
Different letters above bars indicate statistically significant difference at p<0.05, comparisons were made within each sub-figure.