Studies on the relationships between ecotypic characteristics and distribution of some important trees in Japan

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Dormancy can be understood as a manifestation of adaptation by an individual species to its envirnment. Research on the nature of various types of dormancy of some tree species distributed in different environments from northern cold areas to southern subtropical areas seems to give useful information about the process of adaptation to the environment. These comparative studies may supply some promising clues to various important problems in the physiological fields.Machilus thunbergii Sieb. et Zucc. is distributed continuously from Okinawa Pref. to Aomori Pref. in Japan. And the seedlings from Iriomote Island, Okinawa Main Island and Amami Island are not able to survive in the winter in Mie Pref., but the ones from Kochi Pref., Mie Pref., Chiba Pref., Iwate Pref., and Aomori Pref. are able to survive. The seedlings from different environments may display different natures in regard to dormancy.