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中文摘要：
风沙活动记录的研究对于人们了解气候环境变迁有着重要意义。风成砂层的稳定出露可以作为风沙活动及沙漠形成的最直接证据,因而通过对风成砂-黄土-古土壤序列地层剖面进行对比分析,即可还原地质历史时期风沙活动历史与环境演化。通过对比青藏高原南部、柴达木盆地、共和盆地、青海湖盆地等地区风成沉积剖面的岩性变化,结合14C测年、热释光和光释光测年结果,建立了青藏高原地区全新世以来风沙活动演化历史。青藏高原全新世在11.0kaBP左右开始进入全新世,环境逐渐转向暖湿;9.0kaBP左右出现了一次强烈的风沙活动事件;7.7～4.6ka BP14C大部分地区为暖湿环境,而藏南地区有较大范围风成砂沉积,风沙活动强烈。全新世晚期区域性差异较大,但整体环境恶化,风沙活动增强。
英文摘要：
By comparing the lithological changes of aeolian sections in southern Tibetan Plateau,Qaidam Basin,Gonghe Basin,Qinghai Lake basin and other regions,combined with the 14C dating,the thermoluminescence（TL） and optically stimulated luminescence（OSL） dating,the time series of desert evolution in Tibetan Plateau was established during the Holocene.According to the 14C,TL and OSL dating of 31 aeolian sections,Holocene began at 11.0 ka BP in Tibetan Plateau and the climate became warm/humid;A strong dune activity event were observed around 9.0 ka BP.Palaeosol were widely distributed at 7.7~4.6ka BP,it suggests that the climate was optimum at this time.While in the southern Tibetan Plateau,aeolian deposits were widely distributed,which means the climate was cold/dry.There are great regional differences in Tibetan Plateau at the late holocene,the overall climate deteriorated and dune activity increased.Meanwhile,the existing problems were discussed and the future research direction of the climate change was proposed.
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