冬季季節風下において東北日本周辺に分布する雲に関して,局地高気圧・低気圧との位置的な対応関係を考察した。その結果,850mb面の流れの場の違いによって,局地高気圧・低気圧の発生の有無およびその位置に違いが生じ,この違いによって,日本海の帯状雲が北海道西岸にかかる位置や,太平洋側の雲バンドの出現する位置との対応関係が説明されることがわかった.あわせて,従来言われていた石狩不連続線には,2つの型があることがわかった.

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The purpose of this study is to make clear the conditions of greenery conservation pro-jects by the municipal governments and to examine the new trends towards the positive conservation policy adopted in Ichikawa and Abiko cities, Chiba Prefecture. In this paper, the greenery means woodlands, one of the most important amenity resources in urban environment. The general findings are summarized as follows.
After 1968, a great deal of private woodlands have been converted to urban land use mainly because of the development of residential districts in the Urbanization Promotion Area of the City Planning District. Under the existing circumstances, municipal govern-; menns which are putting emphasis on the conservation of woodlands in urbanized areas issued municipal ordinances regarding greenery conservation and civil forests as recreation space after about 1971. Fifteen cities in the urbanized region in Chiba Prefecture now put these municipal ordinances into operation. There is a positive correlation between the area of preserved woodlands and the population size of fifteen cities studied.
However, these municipal ordinances do not have a positive conservation effect, because woodlands are still being encroached by urban land use. It is necessary to impose legal control in order to preserve surely the remaining woodlands in the Urbanization Promotion Area. In this sense, the enforcement of the positive greenery conservation by the Ichikawa and Abiko municipal governments under the provision of “The Law for the Conservation of Urban Green Space” needs to be highly evaluated as a new trend in the protection of environmcnt

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