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Soil property estimates for the Upper Tana river catchment, Kenya, derived from SOTER and WISE (ver. 1.1)

Entry ID: SOTWIS_Upper_Tana_Kenya

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Summary

Abstract: This data set describes a harmonized set of soil property estimates for the Upper Tana river catchment, Kenya. The data set was derived from the 1:250 000 scale Soil and Terrain Database for the Upper Tana (SOTER_UT, ver. 1.1; Dijkshoorn et al. 2011) and the ISRIC-WISE soil profile database, using standardized taxonomy-based pedotransfer (taxotransfer) procedures.

The land surface of the Upper ... Tana, Kenya, covering some 18,900 km2, has been mapped in SOTER using 191 unique SOTER units. Each map unit may comprise of up to three different soil components. In so far as possible, each soil component has been characterized by a regionally representative profile, selected and classified by national soil experts. Conversely, in the absence of any measured legacy data, soil components were characterized using synthetic profiles for which only the FAO-Unesco (1988) classification is known.

Soil components in SOTER_UT have been characterized using 146 profiles consisting of 109 real and 37 so-called synthetic profiles. The latter were used to represent some 18% per cent of the study area. Comprehensive sets of measured attribute data are seldom available for most profiles (109) collated in SOTER_UT, as these were not considered in the source materials. Consequently, to permit modelling, gaps in the soil analytical data have been filled using consistent taxotransfer procedures. Modal soil property estimates necessary to populate the taxotransfer procedure were derived from statistical analyses of soil profiles held in the ISRIC-WISE database. The current taxotransfer procedure only considers profiles in WISE that: (a) have FAO soil unit names (43) identical to those mapped for the Upper Tana in SOTER, and (b) originate from regions having similar Köppen climate zones (n= 5745).

Property estimates are presented for 18 soil variables by soil unit for fixed depth intervals of 0.2 m to 1 m depth: organic carbon, total nitrogen, pH(H2O), CECsoil, CECclay, base saturation, effective CEC, aluminium saturation, CaCO3 content, gypsum content, exchangeable sodium percentage (ESP), electrical conductivity (ECe), bulk density, content of sand, silt and clay, content of coarse fragments (> 2 mm), and volumetric water content (-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 studies of global environmental change.

The soil property estimates can be linked to the spatial data (map), using GIS, through the unique SOTER-unit code; database applications should consider the full map unit composition and depth range.

Related URL

Link: VIEW RELATED INFORMATION

Description: View project page and download information(Last revised Feb. 2011)

Multimedia Sample

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Caption: Main FAO soil groupings for the Upper Tana river catchment, Kenya

Geographic Coverage

(Click for Interactive Map)

Spatial coordinates

	N: 0.32	S: -1.17	E: 37.91	W: 37.46
Min Altitude: 400 Max Altitude: 4500

Data Set Citation

Dataset Originator/Creator: Niels H. Batjes

Dataset Title: Soil property estimates for the Upper Tana river catchment, Kenya, derived from SOTER and WISE (ver. 1.1)

Dataset Release Date: 20110215

Dataset Release Place: Wageningen

Dataset Publisher: ISRIC - World Soil Information

Version: ver. 1.1

Data Presentation Form: ArcGis 9.x and MSAccess tables (zipped)

Other Citation Details: http://www.isric.org/isric/webdocs/docs/ISRIC_Report_2010_07b.pdf

Online Resource: http://www.isric.org/sites/default/files/private/datasets/SOTWIS_Ke...

Temporal Coverage

Start Date: 1975-01-01

Stop Date: 2010-04-01

Location Keywords

CONTINENT > AFRICA > EASTERN AFRICA > KENYA

Science Keywords

AGRICULTURE > SOILS > CALCIUM

AGRICULTURE > SOILS > CARBON

ISO Topic Category

CLIMATOLOGY/METEOROLOGY/ATMOSPHERE

OCEANS

IMAGERY/BASE MAPS/EARTH COVER

Platform

ADEOS-I > Advanced Earth Observing Satellite-I

Instrument

OCTS > Ocean Color and Temperature Scanner

Ancillary Keywords

EOC

NASDA

Originating Center

JAXA

Data Center

Earth Observation Center, Japan Aerospace Exploration Agency, Japan

Data Center URL: http://www.eorc.jaxa.jp/en/index.html

Data Center Personnel
Name: JAXA EOC USER SERVICES Phone: +81-49-298-1262 Fax: N/A Email: orderdesk at eoc.jaxa.jp Contact Address: Japan Aerospace Exploration Agency (JAXA) Earth Observation Center City: 1401 NUMANOUE OHASHI HATOYAMA-MACHI Province or State: HIKI-GUN SAITAMA-KEN Postal Code: 350-0302 Country: JAPAN