How do the green trees in Longding Village, Xincheng County, Guangxi Zhuang Autonomous Region, predict the weather?

There is a green tree in Longding Village, Xincheng County, Guangxi Zhuang Autonomous Region, my country, which is more than 100 years old. The color of its leaves changes with the weather. On sunny days, the leaves are dark green. When the weather is dry for a long time and it is about to rain, the leaves turn red; when the weather clears up after the rain, the leaves return to their original dark green color. So people call it "weather tree".

This green tree is very sensitive to climate change during its long-term adaptation to its living environment. Before a drought is about to rain, there is often a period of hot and bright weather. At this time, the synthesis of chlorophyll in the leaves is inhibited, while the synthesis of anthocyanins is accelerated and takes advantage of the leaves, so the leaves change from green to green. became red.

When the rain, drought and strong light are lifted, the synthesis of anthocyanins is inhibited and the synthesis of chlorophyll is accelerated. In this way, chlorophyll takes advantage again, so the leaves return to their original dark green color. .