| Budget Amount *help |
¥22,360,000 (Direct Cost: ¥17,200,000、Indirect Cost: ¥5,160,000)
Fiscal Year 2019: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2017: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
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| Outline of Final Research Achievements |
The oxygen isotopic dendrochronology established in Japan has made it possible to determine the age of tree-rings across tree species, which has been difficult using conventional methods. The author has developed the foundation of the method in Tohoku Japan, and has constructed an oxygen isotopic tree-ring chronology from the 5th to the 16th century. The present study aims to extend this to the past 3400 years.
The author obtained oxygen isotope ratio data of Aomori cypress from the 16th century to the present from living trees and archeological woods. In addition, data from the 5th century BC to the 5th century AD were obtained from archeological woods in Niigata and Miyagi prefectures, which were connected with the oxygen isotopic tree-ring chronology of the 15th century BC to the 5th century BC constructed from the buried forest of Mt.Chokai.These studies have achieved the construction of the oxygen isotopic tree-ring chronologies network that is continuous for the past 3400 years.
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