1989 年 39 巻 1 号 p. 45-51
Age structures were surveyed in four plots of temperate coniferous forest dominated by Cryptomeria japonica, Abies firma, and Tsuga sieboldii in western Yakushima, southern Kyushu. The oldest stump in the plots was of Cryptomeria japonica, and more than 945 years old. Many trees of this species were between 100 and 300 years old. Their main regeneration periods had occurred later in upper river plots than in the lower plots. This might be the result of the harvesting locations of C. japonica from 300 to 100 years ago. Most Abies firma and Tsuga sieboldii were older than 250 years although their potential life spans were shorter than C. japonica. Only C. japonica trees were cut selectively. One of the A. firma stumps was 624 years old, the oldest known for this species in Japan.