After the water, oxalate, DCB, or H2O2 treatments, the clay-sized
aggregates ranged from 3.85–11.4% for the YPF soil, which was higher
than that for the OPF soil (2.52–8.58%) (Fig. 2). Relative to the water
treatment, the oxalate, DCB, and H2O2 treatments increased finer
clay- and silt-sized aggregates but decreased larger microaggregates
(50–250 μm) and macroaggregates (250–2000 μm) in both the soils.
The macroaggregates (250–2000 μm) were negligible (0.01% for the
YPF soil and 0.83% for the OPF soil) after H2O2 oxidization in both the
soils, which was significantly lower than that after other treatments.
For the OPF soil, the clay-sized aggregates in the H2O2 treatment
(8.58%) were significantly higher than those in the oxalate (3.24%)