野々海ブナ林における7年間のブナの結実評価

概要

論文の詳細を見る
The fruiting intensities of 98 beech (Fagus crenata BLUME) trees were observed for individual trees at Nonomi beech forest (latitude 37°1' N. and longitude 138°32' E.), Nagano Prefecture during the period from 1984 through 1990. During this period, a mast year occurred in 1984,but 1985,the poorest year, yielded nothing at all. After that year, crops fiuctuated annually until 1990,another mast year. In beech species, a large amount of stored nutrients are consumed in a crop year. The results obtained seem to suggest that the trees begin to recover gradually their fruiting facilities in the year following a mast year. Almost all of the individual trees that had experienced fruiting during the observations bore fruits in the mast years of 1984 and 1990. Significant differences (on the 5% level) were found between the average DBHs of individuals that had experienced fruitings only twice and those that had fruited more than three times. These results may indicate that beech trees change their fruiting types from a none-fruiting type to the type bearing fruit only in mast years, and then to the type bearing fruit in the other years as their growth stages progress.
日本森林学会の論文
1992-01-01