EN
This paper discusses the results of analyses of the influence of temperature and rainfall on the width of tree-rings formed by the Douglas fir (Pseudotsuga menziesii Franco) in the years 1930-1997. The researchers selected six tree stands in the area of the Sudety Mountains. They determined that the size of the radial increments of the Douglas fir was significantly influenced by the temperatures of cold part of the year, before the vegetation season, and by those of the summer. Thermal conditions determined mainly the similarity of the rhythm of variability of tree-ring sizes. In addition, rainfall occurring in winter and during the vegetation season had Lin important, though less significant, impact on the formation of the annual increment. The influence of rainfall during the vegetation season was smaller in the case of trees from the sites located at higher altitudes and in the western part of the Sudety, which is abundant in rainfall. The spatial diversity of rainfall in the area of the Sudety was, probably, the most fundamental factor which caused the variability of the degree of similarity of the incremental rhythm of the trees from particular sites. Despite this fact, however, the Sudety Mountains can be considered as a dendrochronologia И у homogenous region for the Douglas fir.