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Assessment of soil redistribution on two contrasting hillslopes in Uganda using Caesium-137 modelling

Rücker, Gerd und Park, Soojin J. und Brunner, Almut C. und Vlek, Paul L.G. (2008) Assessment of soil redistribution on two contrasting hillslopes in Uganda using Caesium-137 modelling. Erdkunde, 62 (3), Seiten 259-272. DOI: 10.3112/erdkunde.2008.03.06. ISSN 0014-0015.

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Kurzfassung

The assessment of soil erosion by Caesium-137 (<sup>137</sup>Cs) modelling has achieved widespread applications in many regions of the world. Especially for countries in the humid tropics experiencing severe soil degradation, this approach offers the potential to quickly quantify the spatial distribution of soil loss, in order to propose site-specific erosion control measures. This research aims to examine the potential for utilizing the (<sup>137</sup>Cs approach to assess soil redistribution rates in the humid tropics of Uganda. More specific research objectives are: 1) to investigate the (<sup>137</sup>Cs modelling approach and its potential for erosion and sedimentation assessments in the humid tropics of Africa; and 2) to identify the spatial distribution of erosion and sedimentation on two contrasting hillslopes in Uganda. Two cultivated hillslopes with contrasting agro-ecological conditions were selected: one highland site with unimodal rainfall distribution with mollic andosols and a relatively steep slope of up to 18% (Kongta), and one lowland site with bimodal rainfall distribution, strongly weathered plinthic ferralsols and a gentle slope of a maximum of 10% (Magada). (<sup>137</sup>Cs inventories from reference samples were collected in the vicinity of these sites and (<sup>137</sup>Cs inventories from samples were extracted from the intersections of a regular sampling grid that covered each hillslope. The average (<sup>137</sup>Cs reference inventories were 392 and 439 Bq m<sup>-2</sup>, for Kongta and Magada, respectively, which are within the range of the globally interpolated <sup>137</sup>Cs inventory estimated for this region. The modeled net soil redistribution indicated for both sites soil erosion with higher soil losses in Kongta (-21 t ha<sup>-1</sup> year<sup>-1</sup>) than in Magada (-4.5 t ha<sup>-1</sup> year<sup>-1</sup>). Peak hillslope erosion rates were 44.6 t ha<sup>-1</sup> year<sup>-1</sup> in Kongta compared to 36.3 t ha<sup>-1</sup> year<sup>-1</sup> in Magada. In contrast, sedimentation rates in Magada were as high as 25 t ha<sup>-1</sup> year<sup>-1</sup> and significantly higher than in Kongta with 6.4 t ha<sup>-1</sup> year<sup>-1</sup>. These (<sup>137</sup>Cs-based soil redistribution rates were similar to erosion assessments within the same ecological zone based on erosion plot studies and other model applications. Despite the low fallout and some other obstacles, we conclude that the (<sup>137</sup>Cs method might be a suitable alternative technique to estimate soil redistribution on hillslopes in the humid tropics of Africa, such as in the southern region of Uganda.

Dokumentart:Zeitschriftenbeitrag
Zusätzliche Informationen:ERDKUNDE is listed at: Science Citation Index Expanded http://scientific.thomsonreuters.com/mjl/wos_scie_a5021_final.pdf Social Science Citation Index Current Contents/Physical, Chemical & Earth Sciences Current Contents/Social & Behavioral Sciences COS GeoRef GEOBASE - Earth Science Database NSD Norwegian Social Science Data Services
Titel:Assessment of soil redistribution on two contrasting hillslopes in Uganda using Caesium-137 modelling
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Rücker, Gerdgerd.ruecker@dlr.de
Park, Soojin J.Department of Geography Seoul National University
Brunner, Almut C.Zentrum für Entwicklungsforschung (ZEF)
Vlek, Paul L.G.Zentrum für Entwicklungsforschung (ZEF)
Datum:2008
Erschienen in:Erdkunde
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:62
DOI :10.3112/erdkunde.2008.03.06
Seitenbereich:Seiten 259-272
Herausgeber:
HerausgeberInstitution und/oder E-Mail-Adresse der Herausgeber
Winiger, MatthiasNICHT SPEZIFIZIERT
Bendix, JörgNICHT SPEZIFIZIERT
Blotevogel, Hans HeinrichNICHT SPEZIFIZIERT
Dittmann, AndreasNICHT SPEZIFIZIERT
Kreutzmann, HerrmannNICHT SPEZIFIZIERT
Löffler, JörgNICHT SPEZIFIZIERT
Schenk, WinfriedNICHT SPEZIFIZIERT
Zepp, HaraldNICHT SPEZIFIZIERT
ISSN:0014-0015
Status:veröffentlicht
Stichwörter:soil erosion, soil degradation, spatial variability, GIS, soil redistribution, caesium, modeling, humid tropics, Africa
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Geowissenschaftl. Fernerkundungs- und GIS-Verfahren (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Deutsches Fernerkundungsdatenzentrum > Umwelt und Sicherheit
Deutsches Fernerkundungsdatenzentrum
Hinterlegt von: Dr.rer.nat. Gerd Rücker
Hinterlegt am:29 Sep 2008
Letzte Änderung:22 Apr 2013 15:00

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