World Inventory of Soil Emission Potentials (WISE)
Example of WISE-derived soil data (0.5 x 0.5 degree grid)
The WISE project, and various follow-up activities, has developed homogenized sets of soil data, linked to a spatial data set, relevant for a wide range of environmental studies at global scale - agro-ecological zoning, assessments of crop production, soil vulnerability to pollution, soil carbon stocks and change, and soil gaseous emission potentials. For examples of applications see WISE-related publications.
Present work is aimed at generating a 30x30 arc-sec version (WISE30sec) that considers the updated soil-geographical information of the Harmonised World Soil Database (HWSD v.1.2.1) and taxotransfer (TTR) procedures that draw on statistical analyses of some 20,000 harmonised soil profiles. The TTR procedure considers a 7-layer data model (up to 2 m depth) and 19 soil properties. The selected soil propertiesa are commonly required for agro-ecological zoning, land evaluation, crop growth simulation, modelling of soil gaseous emissions, and analyses of global environmental change at a global level. The list includes: soil drainage class, organic carbon content, total nitrogen, C/N ratio, pH (H2O), CECsoil, CECclay, effective CEC, base saturation, aluminium saturation, calcium carbonate content, gypsum content, exchangeable sodium percentage (ESP), electrical conductivity, particle size distribution (i.e. content of sand, silt and clay), content of coarse fragments (> 2 mm), bulk density, and available water capacity (-33 to -1500 kPa), with uncertainty estimates (mean, std).
WISE30sec, with supporting technical documentation, will be released towards the end of 2015; initial results were presented at the occasion of the Wageningen Soil Conference 2015.
The WISE project (1991-1996) was implemented by ISRIC for the Dutch National Research Programme on Global Air Pollution and Climate Change (NRP Project 851039); it involved collaboration with numerous institutions and individuals worldwide. Some 1000 profiles from WISE, version 1.0, were used by the Global Soil Task Force, coordinated by the International Geosphere-Biosphere Programme Data and Information System (IGBP-DIS).
Upon completion of the NRP-project, in 1996, WISE has been maintained and expanded in the context of several externally funded projects. Follow-up activities, with IIASA and FAO (PDF) and IFPRI (PDF), were aimed at deriving revised soil property estimates for the soil units of FAO's (1995) 1:5 million scale Soil Map of the World using taxotransfer procedures. Several GIS data sets (raster) of derived soil properties for the world were prepared, at various resolutions. The most cent versions are: a) 5 by 5 arcmin (Batjes 2012; more) b) 30 by 30 arcmin (Batjes 2005; more).
Profile data from the WISE soil profile database were also used to fill gaps in primary SOTER databases, using consistent taxotransfer procedures, resulting in so-called SOTWIS databases. The latter were used to populate large portions of the Harmonized World Soil Database (HWSD 2012).