Plant Opal and the Nature of Humus in Volcanic Ash Soils, Java Island, Indonesia

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  • HIGASHI Teruo
    Institute of Applied Biochemistry, University of Tsukuba
  • BABA Hiromi
    Institute of Applied Biochemistry, University of Tsukuba

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Other Title
  • ジャワ島の火山灰土壌A層における植物珪酸体と腐植の性状
  • ジャワトウ ノ カザンバイ ドジョウ Aソウ ニ オケル ショクブツ ケイサン

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Abstract

Analyses of plant opal and humus form on the eight soil samples of volcanic ash soils distributed at the footslopes of five active volcanoes around Bandung, Indonesia, were done to examine the effects of vegetation on the characteristics of humus formed. 1) Based on humus form analysis, fulvic acids were perdominated over humic acids in all samples and the type of humic acids were P-type. Values of RF of humic acids were relatively higher for those samples that grass vegetation are prevailing over tree vegetation. 2) Plant opal analysis showed that all samples were rich in that derived from tree vegetation, indicating that the volcanic ash soils investigated have been formed under prevailing forest environment in tropical mountainous regions.

Journal

  • Pedologist

    Pedologist 39 (2), 58-66, 1995-12-31

    Japanese Society of Pedology

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