What direction is the sparse side of the tree's rings and the dense side of the tree?

1. For the northern hemisphere, the growth in the south is fast, the annual rings are sparse, the growth in the north is slow, and the annual rings are dense.

2. For the southern hemisphere, the growth in the north is fast, the annual rings are sparse, the growth in the south is slow, and the annual rings are dense.

Analysis:

Tree rings 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.

The southern side of the northern hemisphere is warmer than the northern side, so the rings on this side are wider. The width of tree rings can help us understand the experience of trees and the relationship between trees and the local environment and climate at that time. Under favorable climatic conditions, trees grow well, xylem increases more, annual rings are wider, and vice versa.

Extended data:

Application of annual rings:

1, calculate the age of the tree.

Tree rings represent the periodic changes in the growth environment of trees, usually followed by an annual change cycle, so tree rings also represent the growth in a year. According to the tree rings, we can infer the age of trees, which can be used to examine the age of forests.

2. Understand the climatic conditions for one year.

The width of tree rings can help us understand the experience of trees and the relationship between trees and the local environment and climate at that time. Under favorable climatic conditions, trees grow well, xylem increases more, annual rings are wider, and vice versa.

For example, the initial rings of trees are generally wide, indicating that the trees at that time were young and vigorous; Sometimes, after a tree has many narrow rings, it suddenly appears wide rings, which shows that the environment and climate are suitable for the growth of the tree in those years when the rings are wide.

The eccentric tree wheel shows that the environment on both sides of the tree is different. Usually the southern side of the northern hemisphere is warmer than the northern side, so the southern side has wider tree rings.

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