Toposequence of soil on diorite mountain in Benguet, Philippines

Abstract

The morphological, physical, chemical, and mineralogical properties of the soils on diorite mountain in Benguet, Philippines were determined. Seven landsurface units of a hillslope namely, interfluve, seepage slope, convex creep slope, fall face, transportational midslope, colluvial footslope, and alluvial toeslope were studied. The genetic relationship of soils is a function of topography. Soils in different positions on hillslope are related to each other by translocation and accumulation processes. The weathering of parent rock had been rapid and enhanced by the warm and humid climate, good drainage and slope of the mountain area. Several pathways of mineral formation probably occurred depending upon the weathering environment. Soils in the interfluve and seepage slope are old which showed well developed profiles. Soils were classified as Typic Hapludults, Typic Kandihumults and Fluventic Dystropepts. Soils in the convex creep slope experienced continuous loss of surficial material while those in the fall face were lost by mass movement. Both landsurface units showed less profile development. Soils in the convex creep slope were classified as Typic Troporthents and Typic Dystropepts while that in the fall face was classified as Typic Troporthents. Soils at the transportational midslope had very deep profile and showed lithologic discontinuity. However, the profiles were well developed. Soils were classified as Typic Haplohumults and Fluventic Dystropepts. Soils at the colluvial footslope and alluvial toeslope had less profile development. Soils in the colluvial footslope were classified as Fluventic Dystropepts and Typic Tropofluvents while that in the alluvial toeslope was classified as Fluventic Dystropepts.

Source or Periodical Title

Philippine Agricultural Scientist

ISSN

317454

Page

166-186

Document Type

Article

Subject

Diorite, Hillslope, Landsurface unit, Soil taxonomy, Toposequence

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