What's Qinggang Tree's name?

Alias: The leaves of Qinggang Tree, such as oak, acorn and Cyclobalanopsis, will change with the weather, so they are also called "meteorological trees". Qinggang Tree is a subtropical tree species, which is common in southern China. It is sensitive to climatic conditions, because the ratio of chlorophyll and anthocyanin in leaves has changed. After a long drought, just before the rain, chlorophyll synthesis was blocked in hot and muggy days, which made anthocyanins dominant in leaves and the leaves gradually turned red. Farmers in some places have learned from their usual observation of the green bar trees that when the leaves turn red, there will be heavy rain in this area for a day or two, and after the rain clears, the leaves turn dark green. According to this information, farmers predict the weather and arrange farm work. There is a "meteorological tree" that can "predict" the drought and flood situation in Anhui Province and the county. This tree is more than 10 meters high. Its trunk can only be surrounded by three children holding hands, and its crown covers more than 100 square meters of ground. It is said that this tree has been growing for more than 400 years. After years of observation, it has been found that according to the time of germination and the density of leaves, we can know whether it was a drought or a flood. For example, trees germinate in front of Grain Rain, and the buds are leafy, so there is more rain this year; Sprouting on time, sparse and dense leaves, the weather is generally good this year; Grain Rain will germinate later, with few and thin leaves, so it will be dry this year. 1934, this tree sprouted after Grain Rain, and there was a severe drought that year. 1954 This tree germinates early and its leaves are flourishing. That year, there was a flood in the local area. Some locals regard this tree as a "sacred tree". Why can this tree predict the drought and flood of that year? Although after investigation, we haven't found a really convincing reason.