The relationship between a yellow leaves of Ginkgo and temperature as a plant indicator.

Abstract

This paper presents a simple observation method of a micro climate based on the plant indicator. The authors observed the yellow leaves of ginkgo planted in the suburbs of Tokyo, in autumn. The processes of turn into yellow from green in ginkgo leaves were classified into simple patterns. For the results of those analysis, the authors apply the logistic function as a mathematical model of the turn processes into yellow from green in ginkgo leaves. Finally, in order to define the process of turn into yellow as a plant indicator, the authors observe the temperature and the integrated temperature around the ginkgo.