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Het onderzoeksproject ''Strijper Aa'' beoogt een analyse te geven van de ecologische structuur van het landschap en de ruimtelijke relaties die zich tussen de onderdelen ervan afspelen. Deze analyse zou een grondslag moeten vormen voor een beheersvisie. In een serie deelrapporten worden verschillende componenten van het landschap besproken. Dit rapport behandelt de resultaten van het onderzoek aan grond- en oppervlaktewater. In latere rapporten worden relaties tussen eigenschappen van deze abiotische componenten met de vegetatie en fauna gelegd.

Geomorfologische kaart

Geomorfologische kaart

Geomorfologische kaart

A geomorphological map of an area of 66 500 km 2in the southeastern part of Kenya has been prepared. In the littoral zone eight major terrace levels occurring between the present shore and approximately 160 m +MSL have been described. Analysis of radiometric datings and uplift rates of the coastal succession suggested that the formation of the terraces extends over the last 1.4 my of the Pleistocene. Soil development indicate a climatic change from humid to savannah conditions at approximately 800 ky BP. Three sedimentary levels occurring in the landward part of the coastal region have been linked with the three highest littoral terraces. In the interior region, the denudation of the vast plains east of the 38° 15' meridian was correlated with the deposition of Plio-Pleistocene deposits in the Lamu embayment and the coast.

Het terrein is van belang in verband met rodoornkwesties, de plannen voor ruilverkaveling en de vraag of bepaalde bouwgronden niet beter geschikt zijn voor grasland. Aan het eigenlijke karteringswerk is een studie en een verkenning van het gebied voorafgegaan. Hierbij werden vooral de werken over het Olüambt van Acker Stratingh, Veneman, Ramaer e.a. geraadpleegd.

Geomorfologische kaart

On the eastern slopes of the Cameroon Mountains soils occurring below the 100- metre contour were surveyed on a scale 1:25,000. Most soils are young marine clay soils used for growing bananas, oilpalms, cocoa, rubber and tea. At some places there are lava streams from the mountains.A more general soil survey was made of the younger and older volcanic soils above the 100-metre contour line and a map, scale 1 : 100,000, was produced.The relative age of the various volcanic deposits could be estimated after completing the study of the origin, genesis and distribution of marine soils, that cover volcanic deposits in the lower part of the plain.The discovery of beach walls at different levels formed as a result of differences in sea-levels and gradual rise of the land, helped to solve various soil problems. Most soils are K-deficient, especially young volcanic soils.

ispartof: Verhandelingen van de Koninklijke Vlaamse Academie van Wetenschappen, Letteren en Schone Kunsten van België, Klasse der Wetenschappen vol:127 nrpages: 267 status: published

Geomorfologische kaart

Geomorfologische kaart

Geomorfologische kaart

Stiboka onderzoek

Stiboka onderzoek

Quaternary geogenesis in eastern Surinam was studied by field methods and sedimentary-petrographic research. The development of the river valleys was explained in terms of changes in sea level, tectonic movements and changes in climate. A preliminary stratigraphy was established.Eight soil profiles were selected for a detailed study of pedogenesis. For this purpose the field data were combined with the results of thin-section analysis and chemical research, including X-ray microprobe analysis. To interpret the mechanical data, a rectangular diagram after Doeglas was used. The chemical data were recalculated into the normative mineralogical composition according to van der Plas & van Schuylenborgh and Burri. Thus bioturbation, clay migration, ferrallization, plinthization, podzolization and the genesis of arable soils were studied.27 soil profiles were classified by the American, the French, and the Brazilian system.

Stiboka onderzoek

Stiboka onderzoek

Quaternary geogenesis in eastern Surinam was studied by field methods and sedimentary-petrographic research. The development of the river valleys was explained in terms of changes in sea level, tectonic movements and changes in climate. A preliminary stratigraphy was established.Eight soil profiles were selected for a detailed study of pedogenesis. For this purpose the field data were combined with the results of thin-section analysis and chemical research, including X-ray microprobe analysis. To interpret the mechanical data, a rectangular diagram after Doeglas was used. The chemical data were recalculated into the normative mineralogical composition according to van der Plas & van Schuylenborgh and Burri. Thus bioturbation, clay migration, ferrallization, plinthization, podzolization and the genesis of arable soils were studied.27 soil profiles were classified by the American, the French, and the Brazilian system.