Abstract
The writer divided the Koriyama Basin and Tamura Mountain in the Northeastern District into three parts according to their topography, where the rate of land utilization is comparatively low. These parts are: (1) The Koriyama. Basin: up land is wide, (2) Western Tamura: hilly, (3) Eastern Tamara: mountainous. Note: Abbr. (1). Kb, (2) Tw, (3) Te. The writer researched. the characters of the distribution of the arable land in these parts with relation to topografphy, using eight figures, namely, (1) Classifi-cation of Topography, (2) Summit level, (3) River level, (4) Relief Energy, (5) Density of an arable land, (6) Density of paddy land, (7) Density of a field (8) Field ratio to an arable land.
Results obtained are as fellows:
(I) There are many paddy lands on the upland in Kb and the density of a paddy land is very large. The density of a dry-field in the hilly Tw is over 30%. These facts show that the rate of land utilization in this region is comparatively high in the Northeastern District. (II) Arable lands are distributed. according to their topographic conditions. Each of these three parts has its own character in the pattern of the. distribution of an arable land. (III) The altitude of the fields is near the summit level both in Kb and Tw. but, in Te, it is near the river level, for the fields are concent rate in the bottom of the valley on account of the high altitude of that part. (IV) The relation between relief energy and arable land: The densities of the arable land in Kb, Tw and Te are classified into large, medium, and sly a proportion to the small, medium and large relief energy of Kb, Tw trea of paddy lands is larger than that of fields in Kb, they are equal in Te and. the latter is larger than the former in Tw.
