The relationship between the early stage color of the leaves of ginkgo and the progress of turning yellow

Abstract

The authors analyzed the relationship between the early stage color of the leaves of ginkgo and the progress of turning yellow. In addition, we were also compared with the decrease in the temperature environment around the Ginkgo at that time. We did an observation in "Tama New Town" of the suburban in Tokyo. The samples of the leaves were extracted from the Ginkgo biloba which is planted into the "Tama New Town" street and the Tama Art University. We were used Hue of the HSV color system for representation of color of the leaf. And we made a mathematical model using the Hue of leaves to express a progression process of turning yellow. As a result, we have shown that the difference between the initial hue of the leaves of the ginkgo is related to the speed of change of the color of the leaf in autumn.