The origin of tree rings?

The origin of the study of tree rings carpenters have long known that there are tree rings on the trunk, and with them, there are textures on the wood. As far as we know, Aristotle's colleagues mentioned the new year's rings, but it was not until Finch first proposed that the rings should be added once a year. Today, as we all know, spring returns to the earth, everything recovers, and the cells next to the bark begin to divide; Divided cells are large, thick and bright in color, which scientists call early wood; After that, the cell growth slows down, the wall thickens, the volume shrinks and the color darkens. This is called houmu, and the dark annual rings on the trunk are formed by houmu. After that, the tree enters the winter dormancy period again, and it goes on and on. In this way, many trees will generate rings of light and dark on the trunk, and each ring is part of the annual growth. This kind of ring is most obvious in coniferous trees, but not obvious in most temperate deciduous trees, and it is not found in many tropical trees at all. Trees are living archives, and the annual rings on the trunk are records. It not only shows the age of the trees themselves, but also shows the changes of annual precipitation and temperature. Tree rings can also record forest fires, early frost and chemicals absorbed from the surrounding environment. Therefore, as long as we know how to reveal the secret of the tree, it will tell us a lot about what happened around it from its birth. Trees can tell us what happened in the past and what will happen in the future. Meteorological records in trees can help us understand the natural forces that contribute to meteorology, which in turn can help us predict the future.