537 years! Our country has established the longest shrub annual wheel width algegehe to date

, Beijing, June 22 (Reporter Qi Fang) tree's annual wheel in addition to representing its age, but also to tell us in those years when the trees grow, local rainfall and other environmental information. So can the annual wheels of the bush reflect that message? Reporters from China
Qinghai-Tibet Plateau Research Institute was informed that the institute's ecosystem pattern and process team Liang Eryuan researchers, etc. set up the Qinghai-Tibet Plateau Namu wrong area 537 years (1479-2015) shrub wheel width algehes. This is the longest shrub wheel width annual table in China to date, which reveals the change of spring climate in the region, and provides natural archival data for the long-term climate change in the high mountainous areas of the central and southern Qinghai-Tibet Plateau. The results were published in Geophysical Research Express.
due to the special geographical environment of the Qinghai-Tibet Plateau, its forests are mainly distributed in the eastern, southeastern and southern slopes of the Himalayas and other marginal mountains, and it is difficult to carry out tree wheel research in the interior of the Qinghai-Tibet Plateau. The first author of the paper,
Qinghai-Tibet Plateau Institute postdoctoral lu Xiaoming introduced that shrubs in the Qinghai-Tibet Plateau is more widely distributed, is to expand the study of tree-based tree wheel network to the plateau interior of the only way. Namu is located in the west wind and monsoon transition area of the Qinghai-Tibet Plateau, which belongs to the high cold desert vegetation area, and the cypress thickets are distributed on the yang slope from 4740 meters to 4920 meters above sea level. In
and arid environments, the cypress shrubs grow slowly, with an average annual wheel width of about 0.3 mm. "However, we don't know if the Champs-Elyses wheel can indicate changes in the living environment over the past few hundred years, as the tree year wheel has done."
team conducted field surveys around the fragrant cypress bushes around the namu fault and found dead cypress plants and some residual stems. By cross-yearing with the sequence of living champs-shrub annual wheels, researchers have established a 537-year-old annual wheel width year table for shrubs. Based on a reliable sample size, the team worked with Professor Zhang Baoqing of Lanzhou University to reconstruct the region's 406 -1605-2010 spring climate change. The reconstructed variable is the drought index-standardized moisture distance flat index (SZI), which considers all drought factors such as precipitation, snowfall, snow water equivalent, steaming, soil moisture and runoff in high-cold areas.
"We found that the growth of high-altitude cypress shrubs was limited by moisture conditions early in the growing season, and that high temperatures increased moisture stress, which was not conducive to the growth of cypress." Researcher Liang Eryuan, author of the paper, said the study found that the Namu fault region experienced two longer periods of drought from 1637 to 1683 and 1708 to 1785, suggesting that cold conditions during period Xiaoice
could lead to a decrease in the water cycle, which in turn could lead to drought.