| УДК |
Аннотация: By controlling the managements of the forests, many swiss foresters noticed that the trees had not developed as forseen. Some foresters attributed this lack of development to the dryness of the least years. In order to control this allegations, the author has examined the development of five series of stocks situated in different climatic conditions: one series in the East of the Swiss Plateau, in a temperate and relatively dry climate, two in the Engadin, in a dry and cold climate. The treegrowth as been measured through the width of annual rings. The autor has examined just one species: Spruce.The author comes to the conclution that the forest reacts to the fluctuations of the sum of rainfall only in dry regions. The author proposes a graphic method for the determination of the minimum meteorological factor
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