Phenology of leaf coloring
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概要
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Leaf coloring is indicator of climate change and so on. In this report, the chemical mechanism and impacts of climate change on leaf coloring were reviewed. Firstly the accumulated daily minimum temperature was proved to relate the leaf coloring (the chlorophyll decreasing) of Acer palmatum. Secondly the relationship between these leaf coloring and the global warming or urban warming were noticed. In the case of leaf coloring date of Ginkgo biloba, there were general wide variance and variations exist among a group of trees at one observation point. So botanical factors such as budding dates are considered to relate to leaf coloring. On the other hand, in the case of Acer palmatum, there were smaller variance than Ginkgo biloba, so the leaf coloring are suggested to refrain the effects of climate. Therefore the mechanism and species of trees should be considered to evaluate on these leaf coloring.
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