What is dendrochronology

Since the beginning of the 20th century, annual ring dating or annual ring measurements have become recognized science and technology. Briefly, temperate regions (some of them tropical) trees make visible circles every calendar year.

Through the tree's life cycle, an annual record or circulation pattern is formed that somehow reflects the climate and environmental conditions of tree growth. These models can match and match rings and trees growing in similar geographical areas and similar climatic conditions.

According to the patterns of these trees, we call it chronological order. From the living tree to the era, we compare the structure of ancient trees with our known age. ) And accurately determine the age of the trees used by ancient architects

This technology was developed by A. E. Douglass in the southwestern United States of America and has been used in many places in the world.

For details on the basic tree chronology procedure used in Cornell Tree Ring Lab, please visit our program page.

The chronology of trees ("tree chronology") is basically an easy way, and has been doing chronology research on trees since childhood. You can calculate the annual ring by cutting a tree, and you can determine the year the tree is planted, as you know that the tree makes a new wheel every year. However, trees make new circles every year, but not all rings are the same. During the rainy season and warm years, the trees grow well, little year is cold and dry. Therefore, when the annual ring is thin, it indicates a cold year, and when the annual ring is thick, I prove that the year is warm. Since summer and winter will never be exactly the same for several years, the wooden ring shows an irregular pattern. Thick rings and thin rings alternate with each other without a special system.

Annual rings (annual rings) are scientific methods to analyze atmospheric conditions at different times of history by comparing exactly with the year when the annual rings (also called annual rings) were formed. The chronology of trees also helps determine the timing of the event and the speed of the environmental change (most notable climate). It also helps arts and architectural works such as wooden panels, buildings and other old paintings. It is also used for calibration of radiocarbon ages for radiocarbon dating. Tree chronology is an important tool for dating group paintings. However, unlike the analysis of building samples that are usually sent to laboratories, the support of painting trees usually has to be measured in the protection department of the museum, which limits the technologies that can be used.

The annual ring model due to climate was developed by A. E. Douglass in the rheology of the University of Arizona at the beginning of the 20th century (now a wide range of annual rings laboratory). Tree chronology is the most effective way to analyze past climate patterns and to identify the age of timber, such as the age of timber used in prehistoric human architecture. An interesting tree pattern called Reaction Tree leads to an inclined tree (tree) because (tree) attempts to straighten the trunk by creating more trees on the side of the tree. Coniferous trees tend to straighten the trunk by gradually increasing the width of the annulus to the underside of the slanted trunk and making it vertical. Therefore it is named compressed wood. In contrast, the trees of angiosperm (hardwood) are called tension woods because the aged rings become wider on the upper side of the lean meat and the trees become visible straight.