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首页> 外文期刊>Journal of geographical sciences >Desert-steppe migration on the Loess Plateau at about 450 kaBP
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Desert-steppe migration on the Loess Plateau at about 450 kaBP

机译：黄土高原约450 kaBP的荒漠草原迁移

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摘要

According to the field investigation, observation by an electronic microscope and x-ray identification and chemical analysis, desert-steppe migration in the Loess Plateau at about 450 kaBP was studied. The data show that gypsum illuvial horizon indicating the desert-steppe environment developed in the early stage of the formation of the fifth layer loess in Shaoling tableland in Chang'an and Bailu tableland in Xi'an of Shaanxi are situated in the southern Loess Plateau. This indicates that remarkable drying occurred, a large-scope migration of desert steppe took place toward south and the climate zone migrated 5 degrees in latitude to south which is the largest migration range indicated by geochemical indexes. The desert-steppe and more wild environment distributed widely on the Loess Plateau at that time. The development of gypsum also indicates that the climate changed at 450 kaBP from monsoon climate to nonmonsoon climate in the Loess Plateau, and the region was not affected by summer monsoon and was in the cold and dry environment of nonmonsoon climate. Annual mean precipitation was about 200 mm, 400 mm less at that time than at present.
机译：根据野外调查，电子显微镜观察，X射线鉴定和化学分析，研究了黄土高原约450 kaBP的荒漠草原迁移。资料表明，表明长沙少岭平原第五层黄土形成早期和陕西西安白鹿平原形成的荒漠草原环境的石膏逆流层位在黄土高原南部。这表明发生了明显的干旱，沙漠草原向南大范围迁移，气候带向南向北纬5度迁移，这是地球化学指标所显示的最大迁移范围。当时荒漠草原和更多的野生环境在黄土高原上广泛分布。石膏的发育也表明，黄土高原地区的气候从季风气候向非季风气候变化了450 kaBP，该地区不受夏季风影响，处于非季风气候的干冷环境。年平均降水量约为200毫米，比当时少400毫米。

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