最近1世紀間の日本における耕地利用率の地域性に関する研究
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概要
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This is a study of the historical transitions and the regional distribution of the arable land utilization ratios in the past 100 years in Japan, and this is to provide fundamental materials useful to reexamine the present agricultural conditions of Japan.The author selected the following years fo view the change during the 100 years; 1877, 1887, 1897, 1910, 1920, 1930, 1940, 1950, 1960, 1965, and 1970. The arable land utilization ratio is calculated by using the following formula;X(%)=total area planted/total arable land area×100The results are shown in Table 1.From this table, the following characteristics can be pointed out:1) The average arable land utilization ratios in the past 100 years in Japan were about 130%.2) The highest figure of the ratios in each prefecture during the 100 years has reached the level of 140%.3) Disparity in the highest and the average ratios is caused by lower ratios in some prefectures like Hokkaido, where the figure before the 1930s was 50-80%.4) The arable land utilization ratio, as a whole, has been falling rapidly in the last ten years (133% in 1960, and 109% in 1970).5) From the viewpoint of the distribution it can be noticed that the ratios are higher in the southern prefectures than in the northern. This is due to different climatic conditions.6) In the southernmost prefectures, for example, Kagoshima and Kôchi, the ratios had been lowest till the 1910s, though climatic conditions there are quite favorable.7) Nowadays, these southernmost prefectures maintain the highest ratios in Japan.8) In Hokkaido and the Tôhoku Province, the ratios have been low all the time in this period.
- 人文地理学会の論文