| dc.description.abstract | Western part of the East Jawa Southern Mountains, which is distributed from Parangtritis,
Yogyakarta to Pacitan Bay is the Gunung-Sewu Hills. The carbonate rocks on the Baron-Wonosari
transect has some litofacies, and the soils overlying the rocks show some color varieties. Topography of
Baron-Wonosari transect can be divided into two areas: southern part (Baron-Mulo) and northern part
(Mulo- Wonosari). The southern part is a hilly land, whereas the northern part is a lowland plain. Soils
on the southern part are dominated by red soils group, whereas on the northern part dominated by black
soils group. The phenomenon is very interesting to be studied. The aim of research was to study relationship
of soil colour with topography and pores of underlying carbonate rocks. Methods consist of landform
especially topography observation, and soil colour by Munsell Soil Colour Chart, whereas laboratory
analysis namely micro porosity and geochemical of carbonate rock. The results showed that micro
pores of rocks have no effect to the soil colour formation. However, secondary pores (macro and mega) be
suggested influent on red soil formation. Concentration of iron (Fe) and mangan (Mn) elements of
carbonate rock have no effect on the formation of soil colour. Topography and rock secondary porosity be
estimated have a role as controlling factors on the formation of soil colour by leaching process mechanism.
An area, which has a high leaching capacity tend to be found much of red soils, whereas an area which
has a low leaching capacity will be formed black soils. | en_US |
