【摘要】 在青海省西南部青藏公路东南侧的通天河支流——布曲北岸 (33°4 4′4 5 .2″N,92°11′2 8.1″E) ,发现一条拔河 0～ 18m的湖相沉积剖面。湖相沉积物的 U系测年结果为 88.9～ 5 6 .2 ka,确定其沉积时代为晚更新世早中期。结合孢粉分析结果 ,本文探讨了青海省西部地区通天河及布曲流域晚更新世早中期的古植被与古气候。初步研究表明 ,在该剖面的下部和上部沉积期间 ,当地生长松、桦、冷杉等乔木和蒿等草本植物 ,气候比较温暖湿润。剖面中部沉积期间 ,蒿、藜、禾本科和麻黄等草原植被明显增多 ,气候凉爽干燥。剖面沉积期间气候曾经历过温暖湿润和凉爽干燥的波动。植被与气候的变化具有从末次间冰期晚期经末次冰期早冰段到末次冰期间冰段中期的特征更多还原

【Abstract】 A section of lacustrine deposits of the Late Pleistocene was discovered in the Buqu Basin of the Changjiang (Yangtze) River source. The lacustrine deposits have U-series ages of 88.9 ka to 56.2 ka. Based on the U-series dating and sporo-pollen analysis, this paper presents a discussion on the paleovegetation and paleoclimate of the Buqu Basin and its adjacent regions during the interval 88.9~56.2 ka BP of the Late Pleistocene. A preliminary study shows that the evolution of vegetation and climate has experienced features of the late stage of the last interglaciation through the early stage of the last glaciation to the middle stage of the interglaciation of the last glaciation.更多还原