How to judge the age of trees

To know the age of a growing tree, a sample with a length of 5- 10cm and a diameter of 0.5 cm is usually drilled on the trunk with a tree measuring growth cone, and the sample volume is 0.98- 1.98 cubic cm. Embedding the sample in a suitable wooden trough, flattening and observing the slice with a magnifying glass.

According to the method of directly checking tree rings given in Tree Survey, the age of trees is calculated and confirmed. After sampling, the tree holes need to be disinfected and then filled with glass glue to ensure the normal growth of trees.

2, the new method:

Scientists have previously found that ordinary fish can judge their age by the rings on the middle ear stone, sharks can judge their age by the circular rings on the spine, and shellfish can judge their age by the rings on the shells.

Extended data:

Reasons for the formation of annual rings:

How are the annual rings formed? First of all, we should talk about the structure and activity law of vascular cambium.

Vascular cambium (or cambium) is a secondary meristem with infinite meristem developed from procambium. In the life of a plant, secondary phloem is produced outward and secondary xylem is produced inward.

The cambium consists of spindle-shaped primitive cells and ray primitive cells. Axially elongated spindle-shaped primitive cells with wedge-shaped ends and rectangular cross sections, the tangential width is wider than the radial width, and the cell length is several times larger than the width.

The axial system of secondary xylem and secondary phloem comes from spindle-shaped primitive cells. X-ray primitive cells are small in size and almost equal or slightly longer in diameter. This primitive cell derived a radial system of secondary xylem and phloem.

Reference source: Baidu Encyclopedia-Tree Age