Abstract
Stand dynamics of 61 years since 1955 of a forest stand located on volcanic mudflows originating from the eruption of Mt. Tokachi in 1857 were examined. The forest stand had standing tree density of 358 trees・ha-1, basal area of 57 m2・ha-1, and stand volume of 658.8 m3・ha-1 in 2015, 158 years after the volcanic mudflows occurred. Pisea jezoensis and Populus maximowiczii dominated the upper layer of the stand, and stem of ingrowth of broadleaved trees had increased. Stand volume increased until 148 years after the volcanic mudflows and then began to decrease. During the past 61 years, the number of trees has decreased by half. Based on the stand development stage after a stand-replacing disturbance, we considered that the forest stand is shifting from the stem exclusion stage to the understory reinitiation stage.
