348a9bcc-ca7d-4fe9-ad34-42fed0d0bf52 dataset Data infodesk ISRIC - World Soil Information data@isric.org 2021-07-14T11:52:04 ISO 19115:2003/19139 2003/Cor.1:2006 4326 EPSG SOTER-based soil parameter estimates (SOTWIS) for Central Africa 2007-05-01 348a9bcc-ca7d-4fe9-ad34-42fed0d0bf52 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. Niels Batjes ISRIC - World Soil Information Senior Soil Scientist PO Box 353 Wageningen 6700AJ Netherlands niels.batjes@isric.org https://files.isric.org/public/thumbnails/sotwis/SOTWIS_CAF.jpg calcium carbon cation exchange capacity electrical conductivity nitrogen organic matter bulk density soil profiles pH salinity texture water holding capacity nutrients Soil science Stratum Africa Central Africa Rwanda Burundi DR of the Congo Region Attribution 3.0 International (CC BY 3.0) 2000000 geoscientificInformation 1955-01-01 1992-07-01 12.2 31.3 -13.5 5.4 zip https://files.isric.org/public/sotwis/SOTWIS_CAF.zip WWW:DOWNLOAD-1.0-ftp--download Download https://isric.org/projects/harmonized-continental-soter-derived-database-sotwis WWW:LINK-1.0-http--related Project webpage https://isric.org/sites/default/files/isric_report_2007_02.pdf WWW:LINK-1.0-http--related Report 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