Good farms are required to be sustainable. This is achieved by an appropriate land use method suitable for the natural environment. A sustainable system of land use can be found in the old Japanese style of agriculture.
An investigation was carried out to determine the optimum ratio of land use among paddy field, upland field, and woodland within small basins (
Yachi) in the Kanto Plain district near Tokyo.
The land use pattern in one watershed showed that the share ratio of land use among paddy field, upland field, and woodland was 33:12:55 in an old map published more than 100 years ago. Since urbanization in the Yachi district started 1970's, there has been a significant change in land use. Unused paddy fields are increasing in number in these districts. The current share ratio among actural paddy field, upland field, and woodland is 19:44:37. The unused paddy field emerges mostly around the ratio of 15:50:35.
This ratio illustrates a lower criterion of sustainable land use. One form of land use has close connections with the other forms. Therefore, taking into account their inter-connection during land use planning is important for sustainable agriculture.
抄録全体を表示