Table 4: Spatial multivariate regression results.

DiagnosticZnMnCuPbCd

Distance threshold (m)150300200150150
Best spatial modelSpatial errorSpatial errorSpatial errorSpatial errorSpatial lag
R2OLS0.3710.1620.3660.5150.558
SLag0.3840.1860.3690.6150.617
SError0.4000.2120.3690.6940.587
AICOLS762.255827.317406.895779.265290.25
SLag763.487828.315408.711772.458286.875
SError760.706825.638406.729762.513288.248
Soil properties retainedpH (+)
CEC (−)
Moisture content (−)
% silt (−)
% sand (−)
% silt (−)
BD (−)
pH (+)
CEC (+)
λ (−)
pH (+)
% sand (−)
% silt (−)
Wy (−)

λ is a spatial autoregressive error term; Wy is a spatially lagged dependent variable; and (+) and (−) indicate the sign of the coefficient.