乗鞍岳ハイマツの樹令および幹の肥大生長

概要

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Six hundred and fifty-two stumps of Pinus pumila were measured at Kuraigahara and the North Ridge of Mt. Norikura. The ages of these trees and their thickening growth are discussed in this paper in connection with their annual rings. 1) The Pinus pumila copse consists of the trees aged between 20 to 210 years, their average age is 80 to 100 years and the maximum age attained is 210 years. 2) In the Pinus pumila community, the average age of the trees becomes increases where the environmental conditions become better. 3) The mean value of the thickness of the annual ring (average of each longest radius and shortest radius) in all the samples studied was 0.241 mm, so that the annual rate of the growth is quite small. 4) In the Pinus pumila community, the thickness of the annual ring is determined by the environmental condition. 5) There is a close connection between the average thickness of the annual ring and the snowfall. If there is much snowfall, the thickening increases, and the snowfall can protect the trees in winter, so long as the snow coverage continues.
日本生態学会の論文
1966-12-01