In japan, many ski resorts collapsed after the bubble burst in the 90's along with the decline in popularity of skiing. And the increasing winter temperature due to global warming makes ski businesses more difficult. Therefore, the number of abandoned ski slopes is increasing and this tendency would go on continuously.In large disturbed area including ski slope, exotic species tend to become dominant. However, the research about forest regeneration in ski slope has not studied enough.
Therefore, we surveyed the followings to detect a main determinative factor in establishment and growth of Larix kaempferi and Betula as a main exotic tree and a native respectively. The study area is Teine Senzyaku-Ski-Resort, closed in 1999 and every tree was cut clearly in 2009.
L.Kaemferi was more abundant in ski slope than in the neighboring forest, and has a tendency to establish in the middle slope, especially in the steep location. And the slope gradient was related to the growth of trees.