自然教育園の土壌図

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A new attempt was made at mapping of soil of National Park for Nature Study, for two reasons as follows. Firstly, soil of this park have to be classified at lower category level because it was mapped at a scale of 1/1,000. Secondly, the degree of human impact for 500 years was intented to be mapped. From the investigation of soil profile, soil of this park was divided based on the following items. A Upland. 1. Thickness of black horizon. I) very shallow : under 10cm. Ii) shallow : 10-30cm. Iii) intermediate : 30-60cm. Iv) deep : over 60cm. 2. Soil structure of surface horizon. I) mainly blocky structure. Ii) mixed with crumb and blocky structure. Iii) crumb structure. Iv) fine crumb structure. 3. Moisture of surface horizon. I) dry. Ii) moist. Iii) wet. 4. Thickness and form of litter horizon. Ii) only L layer over 2cm. I) only L layer under 2cm. Iv) L layer and F layer over 1.5cm. Iii) L layer and F layer under 1.5cm. 5. Thickness of soft horizon. Ii) shallow : 10-30cm. I) very shallow : under 10cm. Iv) deep : over 60cm. Iii) intermediate : 30-60cm. B Lowland. I) Surface horizon is always very wet and has massive structure. Ii) Surface horizon is somewhat dry and has blocky horizon. Six distribution maps on each items were made. Distribution maps of "Thickness of black horizon", "Soil structure of surface horizon" and "Thickness of soft forizon" were combined and soils were grouped into 34 kinds. From this synthesized soil map, compiling a map of "Nature degree of envrronment based on soil" was attempted. As to the Nature degrees, they were divided into four groups as follows. Region I has remains of an influence of human impact. Region II shows recovery from an influence of human impact. Region III preserved natural environment well. Region IV preserved natural environment very well.
国立科学博物館の論文
1978-02-25

自然教育園の土壌図

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