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Desert-steppe migration on the Loess Plateau at about 450 kaBP

Journal of Geographical Sciences 2005年第1期15卷 115-122页

作者： ZHAOJingbo GeographyDepartmentofShaanxiNormalUniversity Xi＇an710062China／／StateKeyLaboratoryofLoessandQuaternaryInstituteofEarthEnvironmentCASXi＇an710054China

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.

关键词： the Loess Plateau gypsum arid climate large-scale migration of desert-steppe

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Progress of loess research in China

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Journal of Geographical Sciences 2004年第S1期14卷 59-63页

作者： ZHAO Jingbo1,2, HUANG Chunchang1(1. Department of Geography, Shaanxi Normal University, Xi'an 710062, China 2. State Key Laboratory of Loess and Quaternary, Institute of Earth Environment, CAS, Xi'an 710075, China) Department of Geography Shaanxi Normal UniversityXi'an 710062China State KeyLaboratory of Loess and Quaternary Institute of Earth EnvironmentCASXi'an 710075China Department of Geography Shaanxi Normal UniversityXi'an 710062China

Progress in Chinese loess research made in recent 15 years was introduced in this paper, including mainly distribution and paleoenvironment significance of Chinese loess, new development of loess formation age, red-brown paleosol types and environmental change, loess-paleosol sequence and climate cycles, monsoon strength change during last interglacial and last glacial periods in the Loess Plateau, climate events, and source areas of loess and material.

关键词： Chinese loess paleosols loess age monsoon strength climate events material source

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