Colloid-Surface Characteristics and Amelioration Problems of Some Volcanic Soils in West Sumatra, Indonesia
Andisols from elevational transects at Mt. Marapi and Mt. Pasaman in West Sumatra, Indonesia were studied to characterize their physico-chemical and mineralogical properties. These soils are developed under audic, isothermic and isohyperthermic climatic regime. They have dark epipedons with high...
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| Format: | Thesis |
| Language: | English English |
| Published: |
2000
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/10513/1/FP_2000_8.pdf |
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| Summary: | Andisols from elevational transects at Mt. Marapi and Mt. Pasaman in
West Sumatra, Indonesia were studied to characterize their physico-chemical and
mineralogical properties. These soils are developed under audic, isothermic and
isohyperthermic climatic regime. They have dark epipedons with high contents of
organic carbon and low bulk densities « 0.9 Mg m-3). All the nine pedons
studied were found to meet the physical and chemical criteria of andic materials.
Major minerals in the sand fraction are quartz, plagioclase, hornblende,
augite, hypersthene, olivine and volcanic glass. Some of the volcanic glass is
coated with amorphous materials. Allophane, cristobalite, feldspars and halloysite are maj or minerals in the clay fraction. Some soils contain imogolite. Halloysite
exists as tubular crystals. Gibbsite is found in Mt. Pasaman soils, while opaline
silica is present in the surface horizons of Mt. Marapi soils. |
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