Hot search first!There are only five 5,000 years old trees in the country, all in this province!Netizen: witnessed Chinese civilization

On September 24th, the topic of only 5 000 ancient trees in#nation's nationally appeared on the hot search. What trees are they and where do they grow?

According to the Weibo news of the Yangtze River Daily, recently, the results of the second (2015-2021) ancient tree resource census results were announced that there were 5.819 million ancient trees in the country's census, of which 5 of more than 5,000 years of ancient trees had 5 5,000 years of ancient trees. The plant, five plants for more than 5000 years in Shaanxi Province, are specifically: Huangdi in Huangdi Mausoleum in Huangling County, Yan'an City, and Laojun Bai, who is more than 20 kilometers away from Huangling County, The Gubai and Luonan County of Shangluo City in the temple.

Picture source: screenshot of the Yangtze Daily Video

In this regard, netizens have hotly discussed:

"This is a living fossil, every piece of bark has the memory of the age"

"5000 years, witnessed Chinese civilization"

According to the Yangtze River Daily, the results of the second ancient tree -famous tree resource survey showed that the most abundant provinces of ancient trees are Yunnan, with more than 1 million plants, and more than 500,000 in Shaanxi, Henan, and Hebei.

The age of the ancient trees across the country is mainly concentrated in 100-299 years, with a total of 987,500 plants; 160,300 years old in 300-499; 68,200 in the tree age of more than 500 years, of which more than 1,000 years of ancient trees There are 10745 strains. As of last year, there were 10 ancient trees in Wuhan for more than 1,000 years, which were specifically distributed in Huangpi, Xinzhou, and Caidian.

So, how do you get five of the ancient trees for more than 5000 years?

Treasure measurement method

Literature Tracking Law: Check out local history, genealogy, historical celebrity travel notes, and other historical documents, obtain relevant written evidence to speculate on the age of the tree.

年轮与直径回归估测法：利用本地（本气候区）森林资源清查中同树种的树干解析资料，或利用贮木场同树种原木进行树干解析，获得年轮和直径数据，建立年轮与Calculate and speculate the age of ancient trees.

Interview Estimation Law: With field inspections and visiting local elderly people to obtain verbal evidence, it is speculated that the trees are roughly age.

Needle measurement measurement method: The drill of the tree is measured through the drilling needle of the needle test instrument, and the drill of the trees is impedance, and the growth status of the ancient trees will be output to identify the age of the tree.

Annual wheel appraisal method: Use growth cone drilling the wood core to be tested, dry, fix and polish the wood core samples, and read the annual wheel of the tree through the artificial or tree annual wheel analyzer.

CT scanning measurement method: Three -dimensional images of the section of the inspection site through the trunk, identify the age of the trees based on the number of years.

Carbon-14 measurement method: The age of the tree is identified by measuring the degree of decay of carbon 14 in trees samples.

Daily Economic News Comprehensive Yangtze River Daily, Xiaoxiang Morning News

Daily Economic News

- END -