ESJ56 一般講演（口頭発表） B1-03

Forest Regeneration after Multiple Disturbances in an Alpine Dwarf Bamboo-Fir Complex

*Cornman, A. （Akita Pref. Univ.）

Disturbances can severely affect the vegetation of an area; indeed, some ecosystems depend on their existence. Of particular interest are areas which undergo multiple types of disturbances, as the active dynamics may be more complex. In the Hakkoda mountain range (Aomori Prefecture), at an elevation of approximately 1350 meters, there is a forest dominated by dwarf bamboo (Sasa kurilensis) and Marie's fir (Abies mariesii). The study site underwent a mature tree-killing typhoon in 1991, and a bamboo-killing mass flowering event in 1995. This study compares an area which was affected by the typhoon and mass-flowering to an area which was affected by the typhoon only. Adult and sapling-age fir trees were censused for size characteristics in 30 m x 50 m areas. Fallen fir trees and their mounds were censused. Additionally, adult fir, log, and open-area microhabitat subplots were assessed for bamboo characteristics, fir seedling counts, sapling growth rates and relative illuminance. The role of microhabitats in boreal fir forest regeneration patterns will be presented in light of single and multiple disturbance dynamics.