LDSF Topsoil Exchangeable Sodium (Exch. Na)
Soil structure can be affected by high concentrations of exchangeable sodium (exch. Na). Erosion risk can increase, and infiltration rates can be reduced in soils with exch. Na concentrations >1 cmolc kg-1. Across the watershed 23% of the topsoils were predicted to have values above this critical level.
There were no significant differences detected between LULC classes. There however were significant differences in elevation and in slope by elevation for both the topsoil (P<0.01) and subsoil (P=0.01). Topsoil on Steep slopes had >100% more Na than either Moderate or Level slope while subsoil had >60%. Values for exch. Na were 100% and 82% higher in the lower watershed for topsoil and subsoil respectively.
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