What are the fortune-telling methods of trees?

Question 1: 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 2: 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 3: You can tell the age of the tree by looking at the stump! what do you think? Tree rings are also called growth layers or growth ring. Concentric rings on the cross section of woody plant stems. Generally, it forms a round every year, hence the name. Each round represents the secondary xylem formed within one year, including early wood and late wood of that year. Because the activity of cambium changes rhythmically with the change of seasons, xylem proliferated by vascular cambium activity also shows structural differences in a year. Most obviously, trees and shrubs grow in temperate and subtropical regions with alternating cold and warm seasons, or in tropical regions with alternating dry and wet seasons. The cambium is active in spring and summer, and the cells formed are large in diameter and thin in wall, so the secondary xylem formed is light and wide in color and loose in structure, which is called early wood or spring wood; In late summer, autumn or dry season, the cambium activity is weakened, the cell diameter is small and the wall is thick, so the secondary xylem formed is dark and narrow in color and dense in structure, which is called late wood or autumn wood. Early timber and late timber formed in that year gradually transitioned to form annual rings. There is a clear boundary between the late wood of that year and the early wood of the following year, and there are wheel lines, which are called annual ring lines. Years of annual rings have formed many concentric rings on the cross section, which makes annual rings appear on the cross section of wood. In production and scientific research, the age of trees can be inferred from the number of annual rings at the base of trunk. Some plants (such as citrus) form more than one annual ring in a year, and each of these rings does not represent the annual growth, so they are called false annual rings. Under special circumstances such as insect pests and abnormal climate, false tree rings may also form in the trunk.

Question 4: 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 5: How old do you think a tree is? Tree rings are also called growth layers or growth ring. Concentric rings on the cross section of woody plant stems. Generally, it forms a round every year, hence the name. Each round represents the secondary xylem formed within one year, including early wood and late wood of that year. Because the activity of cambium changes rhythmically with the change of seasons, xylem proliferated by vascular cambium activity also shows structural differences in a year. Most obviously, trees and shrubs grow in temperate and subtropical regions with alternating cold and warm seasons, or in tropical regions with alternating dry and wet seasons. The cambium is active in spring and summer, and the cells formed are large in diameter and thin in wall, so the secondary xylem formed is light and wide in color and loose in structure, which is called early wood or spring wood; In late summer, autumn or dry season, the cambium activity is weakened, the cell diameter is small and the wall is thick, so the secondary xylem formed is dark and narrow in color and dense in structure, which is called late wood or autumn wood. Early timber and late timber formed in that year gradually transitioned to form annual rings. There is a clear boundary between the late wood of that year and the early wood of the following year, and there are wheel lines, which are called annual ring lines. Years of annual rings have formed many concentric rings on the cross section, which makes annual rings appear on the cross section of wood. In production and scientific research, the age of trees can be inferred from the number of annual rings at the base of trunk. Some plants (such as citrus) form more than one annual ring in a year, and each of these rings does not represent the annual growth, so they are called false annual rings. Under special circumstances such as insect pests and abnormal climate, false tree rings may also form in the trunk.

Answer time: April 2008-1213: 30.

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Other answers depend on tree rings.

Answer time of carved flowers: April 2008-1213: 28

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Look, the annual rings represent one year old.

M "Choice" Answer Time: April-1213: 30, 2008

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Take a branch from the branch (neither too big nor too small, cut it flat with a hacksaw)

Besides the outer skin, count the circles on the trunk, and one circle represents one year.

Preminder p reply time 2008-04- 12 13:30

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1. Tree ring identification method

Tree rings refer to the dense concentric circles of wood on the cross section of the trunk. The identification of tree rings refers to the method of estimating the age of trees according to the number of tree rings. A special sampling tool (tree growth cone) can be used to drill core samples from two different directions at the base of the trunk at a distance of 1.3m from the ground, and the sampling depth should reach the pith.

2. Interview estimation method

In the investigation of ancient trees in rural areas, it is generally possible to infer the approximate age of ancient trees through field visits and interviews with local elderly people.

Interview is a relatively simple social investigation and research method. As an auxiliary method for the age identification of ancient trees in rural areas, it also has great errors and limitations, and is only suitable for the identification of ancient trees with younger age (such as less than 300a years).

3. Literature tracking method

4. Field investigation methods

On the basis of in-depth investigation and understanding of the local climatic and geographical background and mastering relevant information, the relevant morphological and physiological indexes of rural ancient trees were measured (analyzed and tested) on the spot. Then, using the professional basic knowledge learned by the researchers, the growth status, morphological characteristics, appearance aging degree, biological characteristics and related measurement (test) results of the tree species are comprehensively analyzed to infer their age.

5. Analogical reasoning method

In the process of field investigation, for some trees that cannot be sampled and specific,

The measured ancient trees in rural areas can be based on the statistical data of ancient tree samples measured in the same (or similar climatic and geographical background) areas in the past, and the average values obtained by different tree species and different age groups can be used as the empirical values for calculation and tree ring interpretation, thus solving the problem that it is difficult to judge the age of these ancient trees.

6. 14C dating method

14C dating method is a very classic method in the dating of paleontology or cultural relics. This method is not only complicated in experimental procedure and complicated in operation, but also needs the support of expensive equipment and technical force. Although the test results are more accurate (lOa) in a long time span, it is difficult for general units to have such test means and conditions.

Answer time: April 2008-1213: 38

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Ring number

じ Wei Jie's Answer Time 2008-04-65438

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Question 6: How to judge the age of a tree by its annual rings? 10 minutes, the cross section of the sawn tree has a circle of marks, which are the annual rings of the tree. Count how many circles there are on the cross section of the tree, and you will know how many years the tree has grown.

How do trees form annual rings all year round? Biologically, there is a layer of cells between bark and wood. This layer of cells neatly forms a circle and constantly divides into new cells. Year after year, the trees will grow stronger and stronger. This layer of cells is called cambium. In the rainy season of spring and summer, when the sun is shining and the rain is abundant, trees will grow rapidly. At this time, the cambium rapidly divides into many new cells. These cells are large, and the wood formed is loose and light in color. In autumn, the weather turns from warm to cold, and the rainfall decreases accordingly. At this time, the formation of splinter cell slows down, and the divided cells are small in size, dark in color and fine in texture. Because of the different density and color of wood, a clear ring is formed. Year after year, there are more and more rings, and the achievements of young trees are gradually growing tall and strong.

Question 7: What do you think of tree age and tree rings? One lap is a year. If it can't be a complete tree, you can look at the diameter, and then compare the approximate length and thickness of the tree in one year, and roughly calculate the age of the tree.