Open AccessMicromorphological characteristics of soils developed on volcanic ash in Lembang area, West Java, Indonesia
Author(s) -
Edi Yatno,
Muhammad Hikmat,
Erna Suryani
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/648/1/012005
Subject(s) - volcanic ash , soil water , weathering , geology , feldspar , hornblende , mineral , clay minerals , volcano , mineralogy , geochemistry , soil science , materials science , quartz , metallurgy , biotite , paleontology
The study of micropmorphological characteristics of soils formed from Volcanic Ash in Lembang area, West Java is still rare. The aim of this study is to determine micromorphological characteristics of soils on Volcanic Ash in Lembang area. About 16 Kubiena boxes soil samples from three representative soil profiles were analyzed to determine their micromorphological characteristics. Results of thin sections indicated that the soils show most horizons of the soils developed on volcanic ash have granular microstructures. The coarse/fine (c/f) materials related distribution pattern of the soils is open porphyric. The coarse materials found in the soils are generally dominated by hornblende. Some fresh rock fragments are clearly identified and are generally composed of feldspar, hornblende, and hyperstene. The fine materials of most horizons are brown to dark brown, dotted to stipple-speckled clay and showing undifferentiated b-fabric. The main organic materials observed in the profiles are plant root residues of fine to coarse size and are filled by excrement of soil animals. Weathering of rock fragments and mineral alteration are the most common pedofeatures. The high amount fresh ferromagnesian minerals and the granular microstructures indicated that the soils have high nutrient reserves and high pore spaces supporting for plant growth and development.