The main purpose of this paper is to analyze the land-allotment system called “jiwari” or “warikae” and the land use in the area along the Chikuma river in a case of Sannojima, Obuse-machi, Nagano prefecture. There are many settlements which have the systems along the river in Nagano Basin. Sannojima is located on the base of the Obuse Alluvial Fan formed by the Matsukawa river which is one of the branches of the Chikuma.
The results of this study are summarized as follows:
1) The land-allotment system in this area began in the Edo era. It has continued for more than 150 years since then. It was changed by the land reform after the World War II so that the lands became to be alloted equally to all farmers with the spread of egalitarianism.
2) The area along the Chikuma river is subject to frequent floods almost every year. The fieldsand crops are often damaged by them. The land-allotment system has the function that it reduces the possibility of damage of floods. The locations of the fields are regulary shifted to the other in order to avoid the risk of floods.
3) The land use along the Chikuma river is different from the left bank to the right. On the left deciduous tree fruits such as apples, peaches are predominant. On the contrary some kinds of vegetables are cultivated on the right.
4) The lands was alloted periodically every 7 years until 1975. Recently they are alloted every 20 years on the left bank and alloted every 10 years on the right. The period of allotment was prolonged in 1975.
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