North-East of Asia as the temperature hyperzone and its alteration over the past 60 years. Communication 1. Temperature regime of a warm season in the North-East of Asia
ARCTIC AND SUBARCTIC NATURAL RESOURCES
Distribution of 15 warm season indicators, extensively studied in ecology over the North-East of Asia was studied based on the data from 97 weather stations (w/s) during the years from 1931 to 1960. The continental part of the North-East of Asia and the Okhotsk sea are indistinguishable by May temperature (-0,5...2,5°С) and the dates of snowloss (14.05-25.05). Variation of other 9 indicators in the same regions coincided to different extents. The ranges of temperature sums above 0 ° and 5 °С
... the dates of temperature transition over 0 °С in spring coincided to a higher extent (by 70-75 %) than other parameters. The common parts of the named ranges are 1130-1330 °С, 1066-1290 °С, and 9-18.05, respectively. The mean July temperatures and the dates of temperature transition over 10 °С characterize the continental areas as warmer than coastal ones, while the number of days with temperatures higher than 0 °C and the duration of snowless periods characterize the continental areas as colder ones. Almost the entire mountainforest belt of the North-East of Asia, which is dominated by open larch forest and dwarf pine communities, may be considered as a uniform temperature hyperzone during the warm season. The landscape monotony is explained by the weak gradients of heat supply and by the outstanding ecological resistance of the dominants of vegetation cover. Keywords: hyperzone, air temperature, warm season, open woodland, North-East of Asia. Acknowledgements. The research was carried out with support from the Russian Foundation for Basic Research .