青海托索湖地区第四纪晚期孢粉组合特征及古气候变迁

东昆仑托索湖地区第四纪晚期的湖相层中含丰富的孢粉化石，根据湖相沉积的各层段不中不同类型的植物孢粉组合特征，大致可划贫出５个植被演化阶段，从孢粉在这５个阶段中的垂向分布情况来看，本区第四纪晚期的古气候曾发生过多次波动，从变化趋势上看，早期气候相对较湿热，后期逐渐变得干冷；从变化幅度上看，早期气候波动则晚期变则相对较明显。

LATE QUATERNARY SPOROPOLLEN ASSOCIATION AND PALAEO-CLIMATIC EVOLUTION IN TUOSUOHU AREA, QINGHAI PROVINCE

The palyno_fossils are abundant in the Quaternary lacustrine facies layer in the Tuosuohu area, Eastern Kunlun. These palyno_fossils can be classified as five stages of vegetation covers in line with different kinds of plant sporopollens that occurred in their corresponding layers and sections of the lacustrine facies sediments. In terms of the vertical distribution of the sporopollens in these five associations, the palaeo_climate in the Quaternary in this region once experienced several changes. In terms of the changing trend, the climate in the early period was relatively humid and hot, while that in the late period gradually turned dry and cold. In terms of changing magnitude, the climate in the early period did not change greatly, but that in the late period changed relatively dramatically.