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After the trees, there are many concentric ring on the tree pier, and the botanic is called annual wheels. The annual wheel is that the trees are influenced by the season during the growth process, and a round is generated one year. Every spring, the weather is mild, the rain is abundant, the trees grow quickly, the formed cell volume is large, the number, the cell wall is thin, the material is loose, the color is shallow, called early, and in the fall, the temperature is getting cool, The rainfall is rare, the trees are growing slowly, and the formation of cells is small, small, the cell wall is thick, the material is tight, the color is deep, called the evening or autumn material. Spring and autumn materials in the same year are called annual wheels. The first year of autumn materials and the second year of spring, the boundary is clear, and become a year-on-year wheel line, indicating that the material is growing alternating point. Therefore, from the number of trunk base annual wheels, you can understand the age of this tree.
The birth of the annual wheels of trees is because the trees are in the spring to the summer, the cells forming layers in the bark have increased rapidly; in autumn to winter, the increase in cells slowed down. Therefore, the part of the plant grows in spring and summer is soft, and it is relatively thick; the part grows narrower in autumn and winter. As the trees grow thick in the year, it has formed a year round.
Implication information
Growing trendy area and trees in the tropical area of the rainy season, the alternating season, and the trees grown in areas where the four seasons have changed in the region. The wheel is not obvious. On the annual wheels of trees, there is a lot of historical information in climate, astronomy, medical and environment. At the same time, in terms of historical archaeological, forestry research, geology and public security cases, the annual ring also plays an important role.
Historic, the common annual period is estimated to estimate the specific era of some historical events. For example, in the vast sea, there is a small vessel that has sunken, according to the wooden ship's pattern (annual round), can determine the tree species of shipbuilding; determine the era of shipwreck in the absence of material corrosion conditions, and some historical events related to this era.
and because our country is in the north hemisphere, the annual wheels of the trees are often "Nanshi North Second", so the annual wheels of the trees are also the way we discriminate. one.
Japanese scientists were detected by two old cedar on a site, found that it was impacted by the mysterious universe radiation energy at the end of the 8th century. The carbon 14 content between 774 to 775 is 1.2% more than the annual annual period; according to the carbon concentration, the high radiant material content of the environment is even more amazing. Even in the sun's large spraying cycle, it is far lower than the energy brought by this cosmic radiation impact. In addition, there is no record in the same period, and the scientist still cannot infer what is the reason, causing the mysterious universe radiation event at the time.
Climate test
Meteorology, can understand the climate status of each year through the broad narrowness of the annual wheel, using the information on the annual wheel, can speculate on the climate change situation of thousands of years . The annual wheel wide indicating that the light is sufficient, the wind is smooth; if the annual wheel is narrow, it means that the temperature is low, the rain is small, and the climate is bad. If the climate in a certain place has a certain periodicity, it is reflected in the annual wheels, there will be corresponding wide and narrow periodic changes.
American scientists found a drought in the Western Grassland in the Western American Western Grassland, and applied this rule to correctly forecast the 1976 drought. Chinese meteorologists have studied the annual wheels of an ancient Castbai tree in Qilian Mountain, and revised the different growth stages, and the climate in China has been in the past millennium. The 17th century to 19 At the 1970s, the longest cold period has been in the past millennium, lasts 250 years.
Environmental test
In environmental science, the annual wheel can help people understand the history of pollution. German scientists use spectroscopy to study the trees of Tree wheels such as Ferrant, which has mastered the pollution of metal elements such as lead, zinc, manganese in these areas, and passed the contamination of different era. , Find the main reason for environmental pollution.
In medicine, the annual wheel has a certain role in exploring the causes of local diseases. For example, the platinum content of trees in trees in the annual incidence of high incidence in Heilongjiang and Shandong Province is lower than normal year. This is very consistent with the results of geochemical pathology.
In the forest resource survey, based on the broad narrowness of the annual wheel to understand the growth situation of forests in the past few years, predict future growth dynamics, in order to formulate forestry planning, determine reasonable harvesting, adopting different business measures to provide science in accordance with.
In recent years, the United States has introduced annual wheels into seismic research. They believe that after the earthquake is inclined, the annual wheel has left a trace of trunks to ensure the efforts of the straight growth; it is, as the root transverse fault or near the fracture, due to the hindrance, the annual round of the year smaller. This can be understood that the time and intensity of the earthquake at the time, and can reveal the history of seismic history and cycle, so that the prediction forecast for seismic can be carried out.
Year Wheel Determination
The annual turn records the traces of nature, which is a very precious scientific information, which has been recognized by people. In order to observe the annual wheel, people can use a dedicated drill to drill into the tree heart from the bark, then take out a thin piece, there is all annual wheels. This is not to cut the trees, you can know the age of trees, thus providing scientists with materials.
Japan has developed a new method of observing annual wheels - CT scanning method. This approach is not only available to observe the growth of trees, but also the internal conditions of woodworking and engraving and other woods.