中文摘要：

通过河西走廊西部地区条湖剖面沉积物元素地球化学分析，结合高精度AMS^14C测年，探讨研究区～11400—1060 cal BP期间的气候环境演变过程。研究结果显示～11400～9400 cal BP期间，条湖处于高水位且流域内化学风化作用较强，气候条件相对温暖湿润；～9400—8100 cal BP期间，湖泊水位下降，化学风化作用减弱，指示了干旱的气候条件；～8100—5800calBP气候相对湿润，其中最湿润时段出现在-8100—7200calBP之间；-5800-4800 cal BP期间，气候转干-4800 cal BP以后人类活动增强，导致区域荒漠化加剧。

英文摘要：

A 210-cm-long laminated sediment core was collected from Tiaohu Lake in the western Hexi Corridor, and used to investigate the climate and environmental changes during -11400-1060 cal BP, based on elemental geochemistry and precise AMS-t4C dating. The level of Tiaohu Lake is high with intensified chemical weathering in the area indicating relatively warm and humid conditions from -11400 to 9400 cal BP. The lake level dropped and the intensity of chemical weathering weakened, suggesting dry conditions between -9400 and 8100 cal BP. During -8100-5800 cal BP, the climate was relatively wet in the study area. One of the most humid periods occurred between 8100-7200 cal BP in the Holocene. The climate became dry in the area between -5800 and 4800 cal BP. After -4800 cal BP, increased human activities resulted in the severity level of desertification in the study area.