The spatial variability of some physicochemical
properties of topsoils/subsoils under secondary forest, grassland
fallow, and bare-soil fallow of three locations was evaluated. The
data were analyzed and described using classical statistical parameters.
Based on the coefficient of variation, bulk density, total porosity,
60-cm-tension moisture content, and soil pH were of low variability.
Coarse and fine sand were of moderate variability. Highly
variable soil properties included silt, clay, macroporosity, saturated
hydraulic conductivity, organic matter concentration, and
cation exchange capacity. Overall, soil pH and silt varied the least
and the most, respectively. Relative weighting showed that location
dominantly influenced the soil variability, except for soil porosity
and organic matter concentration influenced mostly by land use.
Most of the soil data were normally distributed; others were positively
skewed and/or kurtotic. The minimum number of samples (at
25 samples ha-1) required to estimate mean values of soil properties
was highly soil property-specific, ranging from 1 (topsoil pH-H2O)
to 246 (topsoil silt). Cation exchange capacity of subsoils related
fairly strongly with cation exchange capacity of topsoils (R2 =
0.63). Spatial variability data can be used to extrapolate dynamic
soil properties across a derived-savanna landscape.
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