抄録
The secondary succession in the grassland of the Utsukuahigahara Heights (ca. 2000 m above sealevel), was investigated by using permanent quadrats set on May 31,1959 at 3 areas, covered respectively with thicker (area 2), mean (area 1) or thinner (area 3) snow during the winter. Each of these areas consisted of 3 experimental sections : the grassland protected from treading, the bare-ground newly prepared within the protected one, and the unprotected grassland. In 1969,the vegetation of the bare-ground (area 2) recovered to almost the previous condition. In area 1 and 3,however, the central zone of the bare-ground remained as it was, and only its peripheral zone was covered with grasses. In both the protected and unprotected grasslands, the vegetation was simplified due to the number of plant species reduced from year to year. The unprotected grassland was characterized by a considerable decrease of herbs coverage.
