Table 1.
Summary of abbreviations in this article.
Table 2.
Information of the studied zonal soils.
Fig 1.
Location and soil profiles of selected typical zonal soils in central-south China.
Table 3.
Basic physicochemical properties of studied soils.
Fig 2.
Grain size distributions of zonal soils selected under different treatments.
Blue diamond, air-dried soils (AD); red-square, water dispersion (WD); yellow-triangle, chemical dispersion (CD).
Table 4.
Parameters of grain distributions under different treatments (AD, WD and CD).
Fig 3.
Differences in volume (ΔV, %) between the water dispersion (WD) and air-dried (AD) treatments for the zonal soils in three clusters.
Fig 4.
Differences in volume (ΔV, %) between the chemical dispersion (CD) and water dispersion (WD) treatments for the zonal soils in three clusters.
Fig 5.
Mean volume diameter (MVD) and specific surface area (SSA) of different zonal soils: (a) MVD in water dispersion (WD) treatment;(b) SSA in WD treatment; (c)MVD in chemical dispersion (CD) treatment; (d) SSA in CD treatment.
Table 5.
ANOVA results for the effects of soil type, horizon, treatment and their interactions on the aggregate stability.
Fig 6.
Detachability index (DI) and aggregation index (AI) of different zonal soils.
Table 6.
Correlation coefficients between the indices of water stable aggregates and soil basic properties.
Fig 7.
Standardized coefficients (a) and R2 (b) of entered variables in multiple stepwise regressions.
(*, **, *** by the side of every bar represent the significant levels at p<0.05, 0.01 and 0.001 separately; BD, bulk density; 2~50μm, the volume of particles(2~50μm); Fed and Ald, free iron and aluminum oxides; Feo and Alo, amorphous iron and aluminum oxides; Fep, complex iron oxides; MVDWD and MVDCD, mean volume diameters of water stable aggregates and particles; Cu, uniformity coefficient; Cc, curvature coefficient; DI, detachability index; AI, aggregation index; SSAWD, surface specific area of water stable aggregates).