Changes in Elemental Composition in the Genetic Process and Conspicuous Functions of Andisols(International symposium on volcanic ash soils and field workshop in the Mt. Fuji area)
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概要
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Andisols, characterized by abundant active Al and Fe, are typically formed from tephras under humid climatic conditions. Due to easily weatherable properties of tephras and little translocation of the colloidal products having selective sorption properties, elemental composition is greatly changed during Andisols formation. Silicon and some alkaline and alkaline-earth elements are removed, and many heavy metals are retained in Andisols during formation of the Al and Fe-rich variable charge materials. High phosphate fixation, Cu and Zn deficiency, slow N mineralizaitoin, excessive exchangeable Al in nonallophanic Andisols and so on were problems for crop production but they were mostly amended by high input of fertilizers. Physical characteristics of the soils with these inorganic and organic materials stem from stable aggregates and porous structure, leading to low bulk density, high water retention, high water and air permeability. These physical characteristics are suitable for upland crop production. Other diverse relationships between properties of Andisols and biological activities are also exemplified. Allophane and imogolite are natural nano-porous materials expected for industrial uses.
- 明治大学の論文
- 2007-02-28
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