The effects of cropping systems on OC and N stocks and C/N ratios in aggregate size classes at the 0–20 and 20–40 cm depths.

<p>FA: Fallow treatment, CA: Continuously cropped alfalfa system; CW: continuously cropped winter wheat system; LG: Legume-grain rotation system.</p

The relationships between changes in OC and N stocks in total soils and changes in OC and N stocks in aggregate size classes.

<p>The units for the changes in OC and N stocks in both total soils and aggregates are kg m^-2.</p

The effects of cropping systems on soil bulk density at the 0–20 and 20–40 cm depths.

<p>FA: Fallow treatment, CA: Continuously cropped alfalfa system; CW: continuously cropped winter wheat system; LG: Legume-grain rotation system.</p

Analysis of variance results for all the variables.

<p>Analysis of variance results for all the variables.</p