Why does the dense side of the tree refer to the north?

The dense side of the tree refers to the north. At the same time, trees grow faster towards the sun, and the annual ring spacing is large and sparse. So the dense side points to the north and the sparse side points to the south.

Extended data

In spring and summer, the environmental conditions such as temperature and moisture are good, plants grow fast, and the xylem formed is sparse and light in color; On the contrary, in autumn and winter, the environmental conditions are harsh, the xylem is dense and the color is dark. With the alternation of the four seasons, the annual rings with alternating shades are formed.

The southern part of the trunk is exposed to more sunlight and grows rapidly in the radial direction, so the annual rings in the southern part of the trunk are wider, while the annual rings facing north on the shady side are obviously narrower.

Chakras are produced by the annual activities of the cambium. The mild climate and abundant rainfall in spring are beneficial to the growth of trees. This is because the cambium cells divide vigorously, the newborn cells are large and obvious, and the ducts are large and many. Therefore, the wood looks light in color and soft in texture. After summer, as the temperature rises. Rainfall decreases, especially in autumn, the weather is getting colder and colder, the rainfall is less, the cambium activity is weakened, and the shape of splinter cell becomes smaller. In addition, the cell wall is thick and there are few ducts, so the wood looks dense and hard, and the color is dark.

Refer to Baidu Encyclopedia-Tree Rings