关键词: 塔里木盆地南缘, 历史时期, 环境变化

Abstract: Based on the high-resolution multi-proxies of climatic changes recorded in lacustrine sediments of the Niya section in the south margin of Tarim basin, the history of climate change has been reconstructed. During 2163-850 BC, the climate was characterized by relatively stable warm-dry conditions, afterwards it turned into a relatively cold-wet period and the cold-wet intensity consecutively increased phase by phase. An evident cold-wet period lasted from 50 BC to 500 AD and ended at about 550 AD. The abrupt climate events happened at about 550 AD and 1000 AD are of very important significance in climate changes of southern Xinjiang during the last 2.0 ka, which indicated that the climate was ever re-arranged greatly. During 850-1300 AD, corresponding to the Mediaeval Warm Period, the climate was dominated by alternation between cold-warm and wet-dry, but with not apparent warming characteristic. Especially during 1100-1200 AD, the stable warm-dry environment of this region was established after a series of climate change rapidly and frequently. Spectrum analysis has throw light on several evident climatic cycles of about 60 a, 15 a, 11 a recorded in the Niya section, which indicated that climate change in this area was possibly affected by solar forcing, and regional comparison shows that climate change during the past 4.0 ka recorded in Niya section has regional consistency.

Key words: south margin of Tarim Basin, historical time, environmental change