東アジア域における落葉広葉樹林を対象としたオゾン吸収量推定に関する成長期間の影響

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To assess ozone impacts on vegetation, the stomatal flux-based method is more appropriate than ozone concentration based indices. The flux-based method recently developed in Europe would also be useful for ozone risk assessment in East Asia. However, it should be modified to apply to the assessment in East Asia because of an interaction between regional climate and species-specific stomatal response on stomatal ozone uptake. For deciduous forest, the length of growing season, when ozone uptake is estimated, is also one of the determining factors. However, it was defined by a fixed time period in previous studies. The fixed time period may remain uncertainty in the estimation of ozone uptake. Therefore, stomatal response for deciduous forests was initially parameterized from scientific literature in East Asia to estimate stomatal ozone flux to deciduous forest. In addition, we made comparisons of simulated cumulative stomatal ozone flux (Fst) for deciduous forests between the following two cases of the length of growing season: 1) the fixed time period (the start and end of growing season were April 15th and October 15th, respectively) and 2) the period based on a phenological model for leaf development. The results showed significant differences in Fst between both cases of the growing season length (up to 22%). In Case 2, high Fst was estimated not only in highest ozone concentration area but also in the moderately high ozone concentration area, such as western Japan and southern China. This showed that ozone effects might spread wide areas in East Asia.
生態工学会の論文
2009-01-31

東アジア域における落葉広葉樹林を対象としたオゾン吸収量推定に関する成長期間の影響

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