「球果痕」から復元したハイマツ球果の豊凶周期と生産様式
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概要
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Cone production by the Japanese stone pine (Pinus pumila REGEL)over the past 15 years (1976-1990) was estimated by counting cone scars on Mt. Kisokomagatake, the Central Japanese Alps. Fruit years occurred at 3-to 4-year intervals with synchronism for stems of various diameters. Major fruit years were 1981,1984,1988 and 1989,whereas fail years occurred in 1982 and 1983. In the fruit years, the number of cone-bearing stems in a scrub but not the number of cones per stem increased markedly, indicating that the fruit years of P. pumila resulted from the increased number of stems participating in cone production. Stems 2 to 4 cm in diameter showed the maximum cone production in the fruit years, whereas stems less than 2 cm in diameter showed poor cone production. These observations suggest that small P. pumila trees have less matter production for cone bearing. Stems more than 5 cm in diameter showed a marked reduction of cone production in fail years, which may have resulted from aging.