The results from a study led by Dr. Juzhi Hou, Dr. Fahu Chen, and Dr. Kejia Ji (Group of Alpine Paleoecology and Human Adaptation (ALPHA), State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment (TPESRE) , Institute of Tibetan Plateau Research, Chinese Academy of Sciences).
The research team obtained a high-resolution climate record of the past 2,000 years using varved sediments in Lake JiangCo on the central Tibetan Plateau. The hot and humid climate during the 7th-9th centuries AD and the subsequent cold and dry periods coincided with the rise and fall of the Tibetan Empire. Climate change is one of the possible reasons for the rise and fall of the Tibetan Empire.
During the preliminary investigation in the field, the researchers found that the varved sediment of JiangCo, a lake in the central Tibetan Plateau, is well preserved. Through early varve counting and other radiometric dating methods, the time interval of a gravity core of up to 1 meter covering the last 2,000 years has been determined.
Subsequently, high-resolution XRF elemental scans and carbonate carbon/oxygen isotope analysis were performed on the sediment, and temperature and precipitation records of the past 2000 years were reconstructed using biomarkers such as alkenones. . The results show that the 7th-9th century AD was an unusually hot and humid period.
Researchers have compared this period with historical literature and found that it coincides with the only unified local regime, the Tibetan Empire, that existed on the Tibetan Plateau at the time. The changes in hot and humid climate and cold and dry climate were related to changes in the foreign policy of the Tibetan Empire.
Combined with the ecological niche model, the researchers simulated the area of highland barley cultivation during the hot and humid period of the 7th-9th century AD and the following cold and dry period, which differed by about 10.88 million hectares. .
In the fragile ecological environment of the Tibetan Plateau, climate change is one of the factors restricting human activities. This latest research results show that hot and humid climates promote the development of agriculture and animal husbandry in the plains, while cold and dry conditions have a negative effect on agriculture and animal husbandry. .
Climate change played an important role in the rise and fall of the Tibetan Empire. Now, with the warming and humidification of the Tibetan Plateau, the study of human-environment interactions in the past has important implications for modern responses to climate change.
The findings are published in the journal Science Bulletin.
Juzhi Hou et al, Climate change underlies the rise and fall of the Tibetan Empire during 600–800 AD, Science Bulletin (2023). DOI: 10.1016/j.scib.2023.04.040
Provided by Science China Press
Citation: Climate change found to have fueled the rise and fall of the Tibetan Empire from 600 to 800 AD (2023, July 17) retrieved on 17 July 2023 from https://phys.org/news/ 2023-07-climate-fostered-fall -tibetan-empire.html
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