Abstract
Abstract Thirty five Typic Paleudults and Typic Hapludults under a Lowland Dipterocarp Forest were characterized for clay minerals, free oxides, cation exchange capacity, and exchangeable bases. Kaolinite was predominant in the soil clays followed by quartz, vermiculite and gibbsite and an accessory amount of illite, partially-interlayered-vermiculite (PIV) and goethite in most soils. Goethite formation appeared to take place concomitantly with the weathering of illite into PIV. Lepidocrocite was found only in the soils of the middle to lower slopes. The magnitude of lepidocrocite formation under hydromorphic conditions was associated with the exchangeable Al level. Cristobalite and hematite were found only in the “red” soils, which may have been subjected to some thermal influences associated with coal combustion. The levels of Fed, Ald, and Alo of the soils were, as a whole, positively correlated with the clay content, respectively. Goethite was considered to be a possible source of crystalline Fe oxide...
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
