Abstract
Fagus crenataforest in Japan has decreased until these days, because of cutting for timber and development for resort. But it has a lot of environment preservation functions and various plant and animal species, so it's important forest ecosystem for human being. Based on a phytosociological survey, the geographical variation of the species composition and the distribution of Fagus crenataforest in Japan, were analyzed and discussed. It has difference in species composition between Japan sea side and Pacific Ocean side. According to our analysis, 5 associations were recognized. And the snow environment and the thermal environment of each association were analyzed. We think our ecological basic data about Fagus crenataforest help the preservation of it.
