河西走廊东段湖泊旋回及其古气候意义

以河西走廊东段石羊河尾闾青土湖为例，通过对志云村剖面沉各气候记录的研究，证实季风边缘是年以上时间尺度的气候变化，具有暖湿，冷干的阶段性特征。自６０００ａＢＰ以来，河西走廊东段渗湖泊回经历了四次湖退和三次湖进过程。除最后一次湖退直至干涸受人类活动影响较大外，其它主要是气候阶段性变化的结果。

Lake Cycle and Its Paleoclimatic Significance in Eastern Hexi Corridor

A preliminary study on the advance and retreat of Qingtu Lake, Hexi Corridor and the sedimentary chimatic records of Zhiyun Village profile has been made through comprehensive analysis. The study shows that the modes characteristics of climatic change in Eastern Hexi Corridor was provided with the corresponding relationship of warm-moist and cold-dry during the scale longer than hundreds of years. As a result of periodicity of climatic change and human activities, Qingtu Lake cycle has undergone a cycle since 600aBP with four lake-retreat and three lake- advance stages. In brief, the evolution of lakes in Eastern Hexi Corridor is characterized by sedimentary continuity, faster sedimentary rate and higher resolution, which not only can indicate the paleoenvironmental and climatic change in Holocene, but also can reflect the intensity of Eastern Asia monsoon.