<国立科博専報>北限界林におけるブナの肥大生長速度

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Northern limit of Japanese beech forest which characterizes Japanese cool temperate zone exists in Kuromatsunai Depression in southern part of Hokkaiodo. The pure stands of beech are well developed continuously as far as the Depression but in the area of Kuromatsunai about 10 km northeastward, not only beech forest but one beech tree cannot be seen (Fig. 1). There are many point of views about the causes of rapid extinction of beech trees, for instance : temperature, precipitation, volcanic activities, forest fires, palynological chronology, etc. has been insisted as the expecting factors. But definite clarification about growth patterns of beech trees in this area have been rare until recently. Using stumps and increment borers, the patterns of the diameter growth of beech trees in this area were investigated. And these patterns were compared with similar ones in central Honshu. The diameter growth rate with the average values in Hokkaido was 5mm/year in 0-50 years, 7mm/year in 50-100 years and 2mm/year in more than 100 years (Fig. 2). Comparing these with those at various places in Honshu, the former is about two times larger than the latter as showing in Fig. 3. But as the difference of the mean maximum diameter-at that size the trees die-between both districts is not so obvious, it appears that the mean life spans of both districts have a large difference : 170 years in northern limit, 250 years in central Honshu respectively. These properties of early maturity and short life span, which caused by the rapidity of tree growth rate show that the span of natural regeneration of beech forests in northern limit must be shorter than those of Honshu. By observations of transplanting of beeches from various localities it was suggested that these properties are depend upon the ecotypic differentiation of beech at each locality.
国立科学博物館の論文
1988-12-01

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萩原信介
国立科学博物館

<国立科博専報>北限界林におけるブナの肥大生長速度

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