1971 年 21 巻 5-6 号 p. 192-197
NAITO, Toshihiko, IWANAMI, Yuuki and Shigeru IIZUMI (Toboku Univ., Sendai) Effects of fire on vegetation of Thujopsis dolabrata var. hondae forest on a hill, Odagawayama, Aomori Prefecture. Jap. J. Ecol. 21,192-197 (1971) The forest dominated by Thujopsis dolabrata var. hondae of about 145 years and situated on the hill. Odagawayama, about 15 km northwest of Aomori city, was burnt on June 2,1967. Before the fire, the forest remained undisturbed, so that the forest floor was covered by a thick layer of dead twings and leaves of about 800 g dry weight per square mater. The forest floor plant communities were compared between the burnt and unburnt forests. The following species markedly increased in coverage after the fire : Aralia slata, Prunus grayana, Rubus cratasgifolius, Rhus japonica, Magnolia abovata, Vitis coignstias, Clorodendrond trichotomum. Miscanthus sinensis, Erigaron bonarionsis and Lactuca indica. The buried-seed populations in the ground of the Thujopsis dolabrata var. hondas forest is detected by the K_2CO_2 method (AWANO and IIZUMI). The species detected amounnted to eleven including Viola grypossvas. Rubus oratasgifolius and Aralia slata etc. Moreover, the seedlings of those species were seen on the forest floor after the fire. To estimate the possible high tempertures of the tree layer during the fire, a burning test with the Thujopsis dolabrata var. hondae leaves was carried out in the laboratory. Thujopsis dolabrata var, hondae leaves are charred in 6 min. at 150℃, and the leaves ignited in one min. at 350℃. It is probable that remarkably high tempertures were caused by the canopy fire in the present study.