Humus composition of mountain soils in Central Japan with special reference to the distribution of P type humic acid |
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| Authors: | Kyoichi Kumada Osamu Sato Yasuo Ohsumi Shinobu Ohta |
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| Institution: | Faculty of Agriculture , Nagoya University , Nagoya , Japan |
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| Abstract: | The central districts of Japan are mountainous areas rising to 3,000 metres which are predominantly covered with forest vegetation. A comprehensive and systematic classification of the soils in this region has not yet been made, but the following soil types have been reported to occur: - 1. 1. Brown forest soils, podzolic soils, black soils and red soils. Described by OHMASA (14)] 2. 2. Alpine grassland soils and alpine meadow soils. Described by KUMADA et al. (9)] 3. 3. A series of randzina-like soils with a very restricted distribution. These are derived mainly from limestone and show various degrees of maturity. Described by KUMADA et al. (8)] 4. 4. Red-yellow soils. These sometimes show a close resemblance to OHMASA's red soils and are found on diluvial plateaux and hills. Described by KANNO (1)] 5. 5. Paddy soils. |
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