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WISE derived soil properties on a 30 by 30 arc-seconds global grid

Short description

The World Inventory of Soil Emission Potentials (WISE) project has developed homogenized sets of soil property estimates for the world. The WISE derived soil properties on a 30 by 30 arc-seconds global grid (WISE30sec) is a harmonized dataset of derived soil properties for the world and includes a soil-geographical and a soil attribute component. The GIS dataset was created using the soil map unit delineations of the broad scale Harmonised World Soil Database, version 1.21, with minor corrections, overlaid by a climate zones map (Köppen-Geiger) as co-variate, and soil property estimates derived from analyses of the ISRIC-WISE soil profile database for the respective mapped ‘soil/climate’ combinations.

Soil property estimates are presented for fixed depth intervals of 20 cm up to a depth of 100 cm, respectively of 50 cm between 100 cm to 200 cm (or less when appropriate) for so-called ‘synthetic’ profiles’ (as defined by their ‘soil/climate’ class). The respective soil property estimates were derived from statistical analyses of data for some 21,000 soil profiles managed in a working copy of the ISRIC-WISE database; this was done using an elaborate scheme of taxonomy-based transfer rules complemented with expert-rules that consider the ‘in-pedon’ consistency of the predictions. The type of rules used was flagged to provide an indication of the possible confidence (i.e. lineage) in the derived data.

Link

Overview: https://data.isric.org/geonetwork/srv/eng/catalog.search#/metadata/dc7b283a-8f19-45e1-aaed-e9bd515119bc

Data files: https://files.isric.org/public/wise/wise_30sec_v1.zip

Soil Organic Carbon GIS files: https://files.isric.org/public/wise/wise30sec_soc_gis_files.zip

Batjes (2016) describes the procedure followed to prepare the data.

Publisher

ISRIC

Dataset owner

ISRIC

Data card author

Dilli R. Paudel

Dataset overview

The dataset considers 20 soil properties that are commonly required for global agro-ecological zoning, land evaluation, crop growth simulation, modelling of soil gaseous emissions, and analyses of global environmental change. It presents ‘best’ estimates for:

Property Meaning Unit Notes
ALSAT Aluminium saturation (as % of ECEC) - Calculated from other measured soil properties
BSAT Base saturation (as % of CECsoil) - Calculated from other measured soil properties
BULK Bulk density $kg$ $dm^{-3}$
CECC Cation exchange capacity of clay size fraction ($CEC_{clay}$) $cmol_c$ $kg^{-1}$ $CEC_{clay}$ is calculated from $CEC_{soil}$ by correcting for contribution of organic matter
CECS Cation exchange capacity ($CEC_{soil}$) $cmol_c$ $kg^{-1}$
CFRAG Coarse fragments (> 2 mm; volume %) -
CLPC Clay (mass %) -
CNrt $C/N$ ratio - Calculated from other measured soil properties
DRAIN Soil drainage class (observed, according to FAO (2006) -
ECEC Effective cation exchange capacity $cmol_c$ $kg^{-1}$ ECEC is defined as exchangeable ($Ca^{++}+Mg^{++}+K^++Na^+$) plus exchangeable ($H^++Al^{+++}$) (van Reeuwijk 2002).
ELCO Electrical conductivity $dS$ $m^{-1}$
ESP Exchangeable sodium percentage - Calculated from other measured soil properties.
GYPS Gypsum content $g$ $kg^{-1}$
ORGC Organic carbon $g$ $kg^{-1}$
PHAQ pH measured in water -
SDTO Sand (mass %) -
STPC Silt (mass %) -
TAWC Available water capacity (from -33 to -1500 kPa) $cm$ $m^{-1}$ Calculated from other measured soil properties. Soil water potential limits for AWC conform to USDA standards (Soil Survey Staff 1983); these values have not yet been corrected for the presence of fragments > 2 mm
TCEQ Total carbonate equivalent $g$ $kg^{-1}$
TEB Total exchangeable bases $cmol_c$ $kg^{-1}$
TOTN Total nitrogen $g$ $kg^{-1}$

Temporal Coverage: NA

Temporal Resolution: NA

Spatial resolution: 30 arc-second

Date published: 2016-05-01

Data modality: Soil properties are tabular (provided in Microsoft Access Database file). The soil unit identifier are provided as a GIS file (e.g. .tif).

Provenance

NOTE: The data is no longer updated or maintained.

Paper: Batjes (2016)

Report: Batjes, 2015

License

Data is shared with CC By 3.0 Attribution license. Redistribution is permitted with appropriate attribution.

How to cite

Batjes NH 2016. Harmonised soil property values for broad-scale modelling (WISE30sec) with estimates of global soil carbon stocks. Geoderma 2016(269), 61-68 ( http://dx.doi.org/10.1016/j.geoderma.2016.01.034 )

References

Batjes NH 2015. World soil property estimates for broad-scale modelling (WISE30sec) Report 2015/01, ISRIC — World Soil Information, Wageningen.

Soil Survey Staff 1983. Soil Survey Manual (rev. ed.). United States Agriculture Handbook 18, USDA, Washington.

van Reeuwijk LP 1998. Guidelines for quality management in soil and plant laboratories, FAO, Rome, 143 p. http://www.fao.org/docrep/W7295E/W7295E00.htm

FAO 2006. Guidelines for soil description (Fourth ed.), FAO, Rome, 97 p. Available here: URL1 / URL2
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