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

This harmonized set of soil parameter estimates for Central Africa, comprising Burundi, the Democratic Republic of the Congo and Rwanda, was derived from the Soil and Terrain Database for Central Africa (SOTERCAF ver. 1.0) and the ISRIC-WISE soil profile database, using standardized taxonomy-based pedotransfer (taxotransfer) procedures.



The land surface of Central Africa, comprising some 2.4 million km2, has been characterized using 244 unique SOTER units, corresponding with 504 polygons. Each SOTER unit may consist of up to 6 soil components; each of these has been characterized by a representative profile. The main soil units mapped for the region have been characterized using 167 real profiles, selected by soil experts as being regionally representative for these units. The associated soil analytical data have been derived from soil survey reports.



Gaps in the measured soil data have been filled using a scheme of using a step-wise procedure that uses taxotransfer rules. These rules were developed using some 5672 soil profiles, held in the ISRIC-WISE database, having similar FAO soil unit names as those reported in the primary SOTERCAF 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, C/N ratio, 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 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 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.

Simple

Date (Publication)
2007-05-01
Citation identifier
348a9bcc-ca7d-4fe9-ad34-42fed0d0bf52
Presentation form
Digital map
Status
Completed
Point of contact
Organisation name Individual name Electronic mail address Role

ISRIC - World Soil Information

Niels Batjes

niels.batjes@isric.org

Author
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

  • Central Africa

  • Rwanda

  • Burundi

  • DR of the Congo
Access constraints
License
Use constraints
License
Other constraints
Attribution 3.0 International (CC BY 3.0)
Spatial representation type
Vector
Denominator
2000000
Language
English
Character set
UTF8
Topic category
  • Geoscientific information
Begin date
1955-01-01
End date
1992-07-01
N
S
E
W
thumbnail




Reference system identifier
EPSG / 4326
Distribution format
Name Version

zip

Digital transfer options

OnLine resource
Protocol Linkage Name

WWW:DOWNLOAD-1.0-ftp--download

 		https://files.isric.org/public/sotwis/SOTWIS_CAF.zip

Download

WWW:LINK-1.0-http--related

 		https://isric.org/projects/harmonized-continental-soter-derived-database-sotwis

Project webpage

WWW:LINK-1.0-http--related

 		https://isric.org/sites/default/files/isric_report_2007_02.pdf

Report
Hierarchy level
Dataset
Statement

1) Batjes NH 2007. SOTER-based soil parameter estimates for Central Africa - DR of Congo, Burundi and Rwanda(SOTWIScaf, version 1.0). Report 2007/02, ISRIC - World Soil Information, Wageningen, Wageningen, https://isric.org/sites/default/files/isric_report_2007_02.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) FAO, ISRIC and UG 2007. Soil and terrain database for central Africa (Burundi and Rwanda 1:1 million scale; Democratic Republic of the Congo 1:2 million scale). Land and Water Digital Media Series 33, Food and Agricultural Organization of the United Nations, ISRIC - World Soil Information and Universiteit Gent, Rome



4) Van Engelen VWP, Verdoodt A, Dijkshoorn JA and Van Ranst E 2006. Soil and Terrain Database of Central Africa (DR of Congo, Burundi and Rwanda). Report 2006/07, ISRIC - World Soil Information, Wageningen,



5) Batjes NH 2008. Mapping soil carbon stocks of Central Africa using SOTER. Geoderma 146, 58-65, http://dx.doi.org/10.1016/j.geoderma.2008.05.006

Metadata

File identifier
348a9bcc-ca7d-4fe9-ad34-42fed0d0bf52 XML
Metadata language
English
Character set
UTF8
Hierarchy level
Dataset
Hierarchy level name

dataset
Date stamp
2021-07-14T11:52:04
Metadata standard name

ISO 19115:2003/19139
Metadata standard version

2003/Cor.1:2006
Metadata author
Organisation name Individual name Electronic mail address Role

ISRIC - World Soil Information

Data infodesk

data@isric.org

Point of contact
 
 

Overviews

overview

Spatial extent

thumbnail

Keywords

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

Soil science


Provided by

Access to the catalogue