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SOTER-based soil parameter estimates (SOTWIS) for Southern Africa

This harmonized set of soil parameter estimates for Southern Africa has been derived from the 1:2M scale Soil and Terrain Database for Southern Africa (SOTERSAF ver. 1.0) and ISRIC-WISE soil profile database.

The land surface of Southern Africa has been characterized using 4022 unique SOTER units, corresponding with 6099 polygons. The major soils have been described using 941 profiles, selected by national soil experts as being representative for these units. The associated soil analytical data have been derived from soil survey reports. These sources seldom hold all the physical and chemical attributes ideally required by SOTER. Gaps in the measured soil profile data have been filled using a step-wise procedure that uses taxonomy-based pedotransfer rules, based on some 9600 soil profiles held in the WISE2 database.

Parameter estimates are presented by soil unit for fixed depth intervals of 0.2 m to 1 m depth for: organic carbon, total nitrogen, pH(H2O), CECsoil, CECclay, base saturation, effective CEC, aluminium saturation, CaCO3 content, gypsum content, exchangeable sodium percentage (ESP), electrical conductivity of saturated paste (ECe), bulk density, content of sand, silt and clay, content of coarse fragments (less than 2 mm), and available water capacity (-33 to -1500 kPa). 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 analyses of global environmental change.

The current parameter estimates should be seen as best estimates based on the current selection of soil profiles and data clustering procedure. Taxotransfer rules have been flagged to provide an indication of the possible confidence in the derived data.

Results are presented as summary files and have been linked to the 1:2M scale SOTERSAF map in a GIS, through the unique SOTER-unit code.

Simple

Date (Publication)
2004-10-01
Identifier
6eb4dafe-a184-44e3-9ed1-d2f73020725d
Presentation form
Digital map
Status
Completed
Author
  ISRIC - World Soil Information - Niels Batjes ( Senior Soil Scientist )
PO Box 353 , Wageningen , 6700AJ , Netherlands
Theme
  • calcium
  • carbon
  • cation exchange capacity
  • electrical conductivity
  • nitrogen
  • organic matter
  • bulk density
  • soil profiles
  • pH
  • salinity
  • texture
  • water holding capacity
  • nutrients
Stratum
  • Soil science
Region
  • Africa
  • Southern Africa
  • Angola
  • Botswana
  • Lesotho
  • Mozambique
  • Namibia
  • South Africa
  • Swaziland
  • Tanzania
  • Zimbabwe
Access constraints
License
Use constraints
License
Other constraints
Attribution 3.0 International (CC BY 3.0)
Spatial representation type
Vector
Denominator
2000000
Metadata language
English
Character set
UTF8
Topic category
  • Geoscientific information
Begin date
1951-11-01
End date
2000-11-01
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S
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Reference system identifier
EPSG / 4326
Distribution format
  • zip ( )

OnLine resource
Download ( WWW:DOWNLOAD-1.0-ftp--download )
OnLine resource
Project webpage ( WWW:LINK-1.0-http--related )
OnLine resource
Report ( WWW:LINK-1.0-http--related )
Hierarchy level
Dataset
Statement

1) Batjes NH 2004. SOTER-based soil parameter estimates for Southern Africa (ver. 1.0). Report 2004/04, ISRIC - World Soil Information, Wageningen, https://isric.org/sites/default/files/isric_report_2004_04.pdf

2) Batjes NH, Al-Adamat R, Bhattacharyya T, Bernoux M, Cerri CEP, Gicheru P, Kamoni P, Milne E, Pal DK and Rawajfih Z 2007. Preparation of consistent soil data sets for SOC modelling purposes: secondary SOTER data sets for four case study areas. Agriculture, Ecosystems and Environment 122: 26-34, http://dx.doi.org/10.1016/j.agee.2007.01.005

3) Dijkshoorn JA 2003. SOTER database for Southern Africa (SOTERSAF; ver. 1.0). Technical Report, ISRIC - World Soil Information, Wageningen.

4) FAO and ISRIC 2003. Soil and Terrain database for Southern Africa (1:2 million scale). FAO Land and Water Digital Media Series 25, ISRIC and FAO, Rome

File identifier
6eb4dafe-a184-44e3-9ed1-d2f73020725d XML
Metadata language
English
Character set
UTF8
Hierarchy level
Dataset
Hierarchy level name
dataset
Date stamp
2021-07-14T11:51:50
Metadata standard name
ISO 19115:2003/19139
Metadata standard version
2003/Cor.1:2006
Point of contact
  ISRIC - World Soil Information - Data infodesk
 
 

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Keywords

bulk density calcium carbon cation exchange capacity electrical conductivity nitrogen nutrients organic matter pH salinity soil profiles texture water holding capacity

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