黄土高原南部晚更新世黄土古土壤与气候变迁

本文对黄土高原南部晚更新世黄土地层作了详细划分。根据武功、洛川黄土剖面构地层结构、地球化学和孢粉分析，确定了形成的黄土荒漠草原和平草原寒冷干旱环境，形成的古土壤落叶阔叶林或森林草原温暖湿润环境。阐明晚更新世黄土高原南部有六个土壤、植被和气候演他阶段，并将其归纳为约四万年为周期的三个暖湿—冷干气候变化旋回，与地层剖面上交替出现的三层古土壤与三层黄土相对应。通过与我国东部和北半球各地不同类型古气候记录的对比，证明黄土高原南部晚更新世黄土记录的气候变化规律在北半球具有普遍性。

LOESS-PALAEOSOIL AND CLIMATIC CHANGES ON SOUTH-ERN LOESS PLATEAU IN LATE PLEISTOCENE

A detailed subdivision is made in the Late Pleistocene loess-palaeosoil on Southern Loess Plateau in this paper. By means of stratigraphical structure, sporopollen analysis and geoche-mical analysis in the loess strata, we recognize six stages of vegetation, soil and climatic changes as well as loess-palaeosoil which belong to thiec climatic cycles, each with a duration of about 40000 years. Meanwhile, comparing with the different Palaeoclimatic records of Northern Hemisphere, three climatic cvcles recorded on Southern Plateau seem universal in Northern Himisphere.