17:15 〜 18:45
[ACG42-P02] Tree growth response to severe drought and heavy rain over the high latitudes of the Northern Hemisphere: dendroecological approach
キーワード：樹木年輪、ITRDB、極端気象、北半球高緯度域
The recent worldwide increase in forest decline may be driven by climate change, especially extreme climate events such as severe drought and heavy rain. The ecosystem may be adversely affected in some cases, which has significant climate-feedback potential. Extreme climate events significantly alter the structure of forests and have a significant impact on forest functions and material cycles, making risk assessment an urgent issue.
In this study, I evaluate the response of tree radial growth to the extreme climate events over past decades in ITRDB (International Tree-ring Data Bank) sites over the high latitudes of the Northern Hemisphere (north of 50°N). Especially, I focus on the relationship between past observed seasonal severer drought and heavy rain and tree growth reduction events estimated by tree-ring width chronologies, and clarified their spatial variability. As initial analysis results, the frequency of tree growth reduction event due to heavy rainfall was higher than expected, indicating that the effects of not only severe drought but also heavy rainfall are essential for understanding tree decline dynamics in the high latitudes of the Northern Hemisphere.
In this study, I evaluate the response of tree radial growth to the extreme climate events over past decades in ITRDB (International Tree-ring Data Bank) sites over the high latitudes of the Northern Hemisphere (north of 50°N). Especially, I focus on the relationship between past observed seasonal severer drought and heavy rain and tree growth reduction events estimated by tree-ring width chronologies, and clarified their spatial variability. As initial analysis results, the frequency of tree growth reduction event due to heavy rainfall was higher than expected, indicating that the effects of not only severe drought but also heavy rainfall are essential for understanding tree decline dynamics in the high latitudes of the Northern Hemisphere.