A harmonized set of soil property estimates was derived from the 1:1 million scale Soil and Terrain Database for the Tunisia and the ISRIC-WISE soil profile database, using standardized taxonomy-based pedotransfer (taxotransfer) procedures.
This harmonized set of soil property estimates was derived from the 1:1 million scale Soil and Terrain Database for the Tunisia and the ISRIC-WISE soil profile database, using standardized taxonomy-based pedotransfer (taxotransfer) procedures.
Property estimates are presented for 18 soil variables by soil unit for fixed depth intervals of 0.2 m to 1 m depth: organic carbon, total nitrogen, pH(H2O), CECsoil, CECclay, base saturation, effective CEC, aluminium saturation, CaCO3 content, gypsum content, exchangeable sodium percentage (ESP), electrical conductivity (ECe), bulk density, content of sand, silt and clay, content of coarse fragments (> 2 mm), and volumetric water content (-33 kPa to -1.5 MPa). These attributes have been identified as being useful for agro-ecological zoning, land evaluation, crop growth simulation, modelling of soil carbon stocks and change, and studies of global environmental change.
Soil property estimates can be linked to the spatial data (map), using GIS, through the unique SOTER-unit code; database applications should consider the full map unit composition and depth range.
The derived data presented here may be used for exploratory assessments at national scale or broader (<1:1 000 000). They should be seen as best estimates based on the current, still limited, selection of soil profiles in SOTER_TN set and data clustering procedure ? the type of taxotransfer rules used to fill gaps in the measured data has been flagged to provide an indication of confidence in the derived data.
Results are presented as summary files; these can be linked to the 1:1M scale SOTER_TN map using GIS, through the unique SOTER-unit code.