Tree ring isotope composition to inform models assessing the sentitivity of the forest carbon budget to increased atmospheric CO2 and climate change

Publicly Offered Research

Project Area	Digital biosphere: integrated biospheric science for mitigating global environment change
Project/Area Number	22H05725
Research Category	Grant-in-Aid for Transformative Research Areas (A)
Allocation Type	Single-year Grants
Review Section	Transformative Research Areas, Section (IV)
Research Institution	Kyoto University
Principal Investigator	EPRON Daniel 京都大学, 農学研究科, 教授 (60844305)
Project Period (FY)	2022-06-16 – 2024-03-31
Project Status	Granted (Fiscal Year 2023)
Budget Amount *help	¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000) Fiscal Year 2023: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000) Fiscal Year 2022: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords	Isotopes / Tree rings / evapotranspiration / water use efficiency / Stable isotopes / Forest carbon budget / Modelling
Outline of Research at the Start	Reliable projections of future forest carbon dynamics are needed owing to the role of forest in the global carbon budget. The isotope composition of tree rings provides information on the physiological response of forests to changes in atmospheric CO2 and climate. We will compare simulation using a multi-layer ecosystem gas exchange model parametrised with long-term series of δ13C, δ18O and δ2H in tree rings with 20-year data of stand-level CO2 and water fluxes, and 50-year data of evapotranspiration calculated from watershed hydrological data.