亚洲内陆干旱区是与亚洲季风区密切关联的一个环境系统,其形成演化与青藏高原的隆起和全球变化等因素密切相关,揭示其干旱化过程和趋势具有重大的理论和现实意义。文章通过对亚洲内陆干旱区柴达木盆地中央鸭湖剖面孢粉和盐类化学指标的初步研究,表明5.3Ma时湖泊周围已分布着以蒿属、藜科、麻黄、禾本科等为主的草原,气候已经变干,由此期较高的氯离子、硫酸根离子及碳酸钙含量表明湖泊演化处于沉积碳酸盐和少量硫酸盐阶段;3.4Ma后草本植物含量略有增加,但离子含量普遍降低,推测气候季节性增强;2.6Ma后耐旱植物花粉含量与盐度指标均呈现明显长期增加趋势,气候快速向更干旱方向发展。 Asia’s arid zone is an environmental system closely linked to the Asian monsoon zone. Its formation and evolution are closely related to the uplift and global changes of the Qinghai-Tibet Plateau. It is of great theoretical and practical significance to reveal the process and trend of its aridification. Based on the preliminary studies on the sporopollen and salt chemical indexes in the central Yahu section of the central Qaidam basin in the inland arid region of Asia, it is shown that the main species of Artemisia, Chenopodiaceae, Ephedra, Of the steppes, the climate has dried up, and the higher chloride, sulfate and calcium carbonate contents indicate that the lake evolution is in the stage of sedimentary carbonate and a small amount of sulfate. After 3.4Ma, the herbaceous plants slightly increased, but the ions The content generally decreased and the climate was presumed to be seasonally enhanced. After 2.6 Ma, the pollen content and salinity of drought-tolerant plants all showed a significant long-term increase trend, and the climate developed rapidly to arid.