ブナ林帯上限および下限の温度領域と更新世末期から完新世中期にかけての夏季気温変化

スポンサーリンク

概要

• 論文の詳細を見る

• The Fagus forest zone dominated by Fagus crenata streches over the Japanese Archipelago from the southwestern part of Hokkaido to Kyushu. The thermal conditions of its upper and lower limits of distribution are examined by a new method inferred from multiple regression analysis of mountainous meteorological data. The vertical distribution of the Fagus forest zone is strictly affected by the temperature during the summer, rather than by the warmth index and annual mean temperature. The summer temperature, which is represented by the mean of monthly mean temperatures for July and August, shows 16.8°C for the upper limit and 21.0°C for the lower limit of the Fagus forest zone.Using both the thermal conditions of the Fagus forest zone described above and the history of migration of the Fagus forest zone indicated by pollen stratigraphies of many sites in Japan, the changes in summer temperature from the latest Pleistocene to the middle Holocene (from 12, 000y.B.P. to 3, 000y.B.P.) are discussed, as follows (Fig. 7);The summer temperature during the latest Pleistocene from 12, 000y.B.P. to 10, 000y.B.P. was estimated to be between 3°C and 7°C lower than at present. Through the period from 9, 500y.B.P. to 6, 000y.B.P., the summer temperature at each site was higher than at present, showing the early phase of the Hypsithermal. Every site was warmer than at present during the period from 6, 000y.B.P. to 4, 500y.B.P.. Although the exact age of the warmest phase of each site could not be specified, the summer temperature during the climax phase of the Hypsithermal rose to 1° and/or 2.5°C higher than at present. The period between 4, 500y.B.P. and 3, 000y.B.P. was the end of the Hypsithermal, and a decrease in summer temperature was shown at every site, though some sites were still warmer than at present.

• 日本第四紀学会の論文

著者

• 大森 博雄

  東京大学理学系研究科地理学教室

• 柳町 治

  法政大学第一教養部

関連論文

• Desertification processes and rehabilitation treatment in the Loess Plateau, China
• Morphological development of longitudinal profiles of rivers in Japan and Taiwan
• Experimental stuidies on vegetation changes due to climate warming at the side of Mt. Norikura, central Japan - a preliminary report
• 北海道におけるハイマツ帯下限およびダケカンバ帯上限, 下限の温度領域
• Temperature changes during the hypsithermal in Japan estimated from vegetation changes
• Morphological characteristics of longitudinal profiles of rivers in the South Island, New Zealand
• 大規模崩壊地の形態学的特長
• アルゼンチン・モンテ沙漠周辺の沙漠化プロセスの研究
• 地形学を進化させる地形分類
• オーストラリアにおける砂丘の再活動とその気候上の意義について
• 東北山地における主要樹種の温度領域からみた「偽高山帯」の成因
• ブナ林帯上限および下限の温度領域と更新世末期から完新世中期にかけての夏季気温変化
• 北海道渡半島江差付近の海岸段丘

もっと見る 閉じる

スポンサーリンク