11:30 AM - 11:45 AM
[HTT16-10] Monitoring the Urban Environment with Carbon Stable Isotopes in Atmosphere and Plants
Keywords:photosynthesis, air pollution, water use efficiency
Stable carbon isotope ratio, a light element isotope, is used in various fields such as atmospheric science and plant physiology as a tool for obtaining information about the atmosphere and plants, because carbon is contained in CO2 in the atmosphere and in plants.
We have focused on street trees, which are urban plants, and have tracked the evolution of atmospheric and leaf isotope ratios from 2005 to 2024 with the objective of “using carbon stable isotopes to propose the best trees for street trees.
The analysis so far has revealed the following.
(1) The atmospheric environment in Kyoto City has changed significantly from 2005 to 2024. Air pollutants such as nitrogen dioxide and particulate matter have decreased significantly.
2) As a result of these improvements in air pollution, there has been a marked improvement in photosynthetic capacity and a decrease in water use efficiency for some tree species.
However, these analyses do not take into account changes in atmospheric CO2 concentrations and their effects on plant photosynthesis, nor the effects of climate change.
In this presentation, we will focus on atmospheric carbon stable isotopes, which have been insufficiently analyzed so far, to see if they reflect changes in the atmospheric CO2 environment in Kyoto City from 2005-2024. Furthermore, we aim to clarify how changes in the CO2 environment and climate change are reflected in the carbon stable isotope fractionation of leaves.
We have focused on street trees, which are urban plants, and have tracked the evolution of atmospheric and leaf isotope ratios from 2005 to 2024 with the objective of “using carbon stable isotopes to propose the best trees for street trees.
The analysis so far has revealed the following.
(1) The atmospheric environment in Kyoto City has changed significantly from 2005 to 2024. Air pollutants such as nitrogen dioxide and particulate matter have decreased significantly.
2) As a result of these improvements in air pollution, there has been a marked improvement in photosynthetic capacity and a decrease in water use efficiency for some tree species.
However, these analyses do not take into account changes in atmospheric CO2 concentrations and their effects on plant photosynthesis, nor the effects of climate change.
In this presentation, we will focus on atmospheric carbon stable isotopes, which have been insufficiently analyzed so far, to see if they reflect changes in the atmospheric CO2 environment in Kyoto City from 2005-2024. Furthermore, we aim to clarify how changes in the CO2 environment and climate change are reflected in the carbon stable isotope fractionation of leaves.