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Soils of the tropical forests of Leyte, Philippines I: Weathering, soil characteristics, classification and site qualities

  • Reinhold Jahn
  • Victor B. Asio
Conference paper

Abstract

Two forest soils representative of two research sites in Leyte, Philippines, are described as to their physical, chemical and mineralogical properties. The soils, an Andosol and an Alisol, which have developed from intermediate quaternary and pleistocene to pliocene volcanoclastics, respectively, represent a chronosequence of soils. The course of weathering is explained in terms of intensity and extent of the turnover of elements, loss of basic elements, desilification and development of pedogenic minerals. The site properties are described quantitatively in terms of rootability, availability of air, water and nutrients, as well as nutrient reserves. Both soils are highly weathered and show more or less the same percentage of desilification. The loss of basic elements is slightly lower in the Andosol than in the Alisol. In addition, there is a distinctly smaller loss of P and Mn in the Andosol. By calculating the turnover and losses of elements in kg per m2, the much higher extent of weathering in the Alisol can be illustrated. The clay mineral association is dominated by imogolite in the Andosol and by halloysite and kaolinite in the Alisol. The progress of mineral alteration can also be observed from the Fe-mineralogy. Both soils have excellent physical qualitites regarding rootability and aeration and water supply to plants. The limiting factor for plant nutrition is the very low amount of available P in both soils, which is aggravated further by high P-retention in the Andosol.

Keywords

Site Quality Humid Tropic Lower Horizon Land Evaluation Fine Earth 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1998

Authors and Affiliations

  • Reinhold Jahn
    • 1
  • Victor B. Asio
    • 2
  1. 1.Institute of Soil Science (310)University of HohenheimStuttgartGermany
  2. 2.Dept. of Agronomy and Soil ScienceVisayas State College of Agriculture, ViSCABaybay, LeytePhilippines

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