In southwestern Hokkaido, volcanic activities were high during historical times. For examination of their effects on forest ecosystem, we conducted preliminary survey using a dendroecological technique. Tree-ring samples were collected mainly in the southern part of the Ishikari Lowland where some layers of pyroclastic fall were found. The number of tree-rings was counted and tree-ring widths were measured. As a result, we could distinguish from the 1739 tree ring measurements the effect of eruption with its subsequent Ta-a volcanic deposition. This proves that the effect on tree growth changed in proportion to distance from the origin of the pyroclastic fall.
雑誌名
Geographical Reports of Tokyo Metropolitan University
号
31
ページ
149 - 156
発行年
1996
ISSN
03868710
書誌レコードID
AA00200173
著者版フラグ
publisher
出版者
Department of Geography, Tokyo Metropolitan University
A preliminary study on the effects of pyroclastic fall deposit on the forest ecosystem in southwestern hokkaido, japan
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