Holocene Climate and Environmental Changes Reconstructed from Elemental Geochemistry in the Western Hexi Corridor
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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 eal 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；～8100-5800 cal BP气候相对湿润,其中最湿润时段出现在～8100-7200 cal BP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.
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-14C 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.
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