How to know the age of a tree?
Generally, there are several kinds that do not destroy trees themselves.
1 by experience
Ask some old people who live nearby.
Depending on the surrounding buildings or materials ..........
4 Isotope determination
Question 2: How to judge the age of trees in places where climate change is obvious? Generally, the age of perennial trees can be judged. When the tree is cut down, concentric circles can be seen on the cross section, which is the tree's annual rings. You can tell the age of a tree by its rings. In temperate zone and subtropical zone with distinct cold and warm seasons and tropical zone with distinct dry and wet seasons, when warm and wet season comes, trees grow fast, with loose wood and light color, forming wide annual rings, while when cold and dry season comes, trees grow slowly, with closely arranged cells, dark color and narrow annual rings. In this way, a ring with a deep color and a line is formed in one year, and the boundaries are very clear. How many years a tree grows, how many rings will be formed. In tropical areas where there is no obvious seasonal change, the growth rate of trees is relatively uniform, so obvious annual rings cannot be formed. According to the age of trees, there are many trees that can live for more than 100 years. Apricot and persimmon trees can live for 100 years, willow and grape trees for 150 years, pear trees for 300 years, jujube trees for 400 years, elm trees for 500 years, birch trees for 600 years, camphor trees for 800 years, figs and pine trees for 1000 years. (Source: China Science City)
Question 3: How do I know how old this tree is? The big tree can't talk or write, so there is no way to tell you its date of birth. Just count the tree rings. The annual rings are in the trunk. When a big tree falls, you can see the annual rings on the shovel surface, and each annual ring represents the growth of plants in a year. In other words, the older the tree, the more rings there are; The younger you are, the fewer rings you have.
Question 4: How do you know the age of a tree? It is more complicated to calculate the age of ancient trees with 1. It is necessary to use the method of carbon 14 cross-location: firstly, the ancient trees are sampled by professional instruments, and the approximate age of the ancient trees is calculated (because the time error calculated by this method is large, some auxiliary means are needed to sample and analyze some similar trees with accurate age. Including the environment where trees grow, soil, precipitation in this area, etc. ), on this basis, write a certain formula, and finally calculate the age of the ancient tree by cross-referencing the analysis results of carbon 14.
The simplest method: This is a way to measure the age of a tree by its annual rings, but you want to know how many years it can't be cut down. The common method is to look at its branches and look down. Annual, biennial and triennial branches, from which the age of the main branch can be calculated. The approximate age of the tree can be inferred from this.
At present, there are three common methods to identify ancient trees in the world.
One is to drill holes in the trunk and determine the age of the tree according to the annual rings;
The second is CT scanning method, but CT is a kind of ray, which has an impact on trees, expensive equipment and high measurement cost;
The third method is the determination of carbon 14, which is widely used in archaeology. You still need to make holes in the tree, and the error is more than 20 years.
Question 5: How to judge the age of trees? Generally, there are several kinds that do not destroy trees themselves.
1 The height of trees and trunks is based on experience.
2. How many small trees are branched from industrial branches? Generally,/kloc-0 branches once a year.
Look how many scars there are on the tree.
In addition to knowledge, but also rely on experience! ! ! ! !
Question 6: How to tell the age of a tree The common way to tell the age of a tree is to look at the tree rings.
An interesting phenomenon can be seen after sawing down trees. On the cross section of the stump, there are circles of concentric circles of different colors and sizes. These concentric rings are called "annual rings".
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. At this time, 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 entering summer, with the increase of temperature and the decrease of rainfall; Especially in autumn, the weather turns cool, the rainfall is less, the cambium activity is weakened, the cell shape is small, the cell wall is thick, and there are few ducts, so the wood looks dense and hard, and the color is dark. The cells and vessels in trees change from large to small once a year, and the materials change from loose to dense, thus forming annual rings with different colors and textures. Tree rings represent the periodic changes in the growth environment of trees. Usually, the climate changes once a year, so the rings represent the growth in a year. According to the number of rings, we can infer the age of trees and use it to examine the age of forests.
However, due to the rhythmic activity of strata, sometimes several annual rings can be produced in a year, which is called false annual rings. Like citrus, it can produce three rings a year. Therefore, the tree age calculated by tree rings can only be a rough figure.
Tree rings can be used not only to calculate the age of trees, but also to 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 a lot, and annual rings are wider; On the contrary, the annual rings are narrow. For example, the initial rings of trees are generally wide, indicating that the trees at that time were young and strong; Sometimes a tree suddenly appears wide rings after many narrow rings appear, which shows that the environment and climate are suitable for the growth of the tree in those years when the rings are wide.
There is also an eccentric ring, which 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 annual rings on the southern side are wider. The temperature change on the earth has a cycle of 200 years. Through the study of the annual ring changes from 1900 to 1960, it is found that there are still small cycles of climate change in 200 years, including 33 years, 72 years, 92 years,11year, and most of them are1year. 1 1 This year happens to be the cycle of sunspot activity, which also shows that the activity of the sun directly affects the change of the earth's temperature.
Now there is a special drilling tool, which can drill all the way from the bark to the core of the tree and take out a thin slice with rings all over it. In this way, it is no longer necessary to cut down trees to calculate their age. Through the study of the change law of tree rings, it is of guiding significance to understand the climate in the area where it is located, and to formulate ultra-long-term meteorological forecast and afforestation planning.
Question 7: How is the tree age calculated? The simplest 30-point method: it is a method to measure the age of a tree through its annual rings, but you can't want to know how many years a tree has paid for it. A common method is to look down at its branches. Annual, biennial and triennial branches, from which the age of the main branch can be calculated. The approximate age of the tree can be inferred from this.
Question 8: How to judge the age of a tree without destroying the tree itself generally has the following kinds.
1 The height of trees and trunks is based on experience.
2. How many branches are there? Small trees usually branch once a year/kloc-0.
Look how many scars there are on the tree.
Besides knowledge, we should also look at experience.
You can see the bark. The bark of annual branches is smooth, while that of perennial branches is rough. The older the tree, the deeper the crack in the bark. This is because bark is the residue of aging cells in the trunk epidermis. The longer it grows, the more dead cells there are, and the rougher it will be. At the same time, as the tree gets thicker every year, the dead cells in the outer layer crack, so there will be tiny cracks in the bark. The longer the age, the thicker the dead cell layer will be, and it will not fall off completely, so the bark crack of the old tree is deep and hard.
This method can only judge the approximate year vaguely, which is not accurate and needs some experience accumulation.
You can also refer to statistical data. There is a certain functional relationship between tree height and tree age. Different tree species have different function formulas. You can calculate the age of trees by consulting statistical data, which is more accurate, but it is also very troublesome.
Question 9: How to judge the age of a tree? Depending on the annual rings is not necessarily accurate, nor can it be counted. Cut down trees when you know your age.
Generally, there are several kinds that do not destroy trees themselves.
1 by experience
Ask some old people who live nearby.
Depending on the surrounding buildings or materials ..........
4 Isotope determination
Question 10: How do I know how old this tree is? The big tree can't talk or write, so there is no way to tell you its date of birth. Just count the tree rings. The annual rings are in the trunk. When a big tree falls, you can see the annual rings on the shovel surface, and each annual ring represents the growth of plants in a year. In other words, the older the tree, the more rings there are; The younger you are, the fewer rings you have.