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Holocene History of Desertification along the Woodland-Steppe Border in Northern China

Published online by Cambridge University Press:  20 January 2017

Hongyan Liu ,
Lihong Xu  and
Haiting Cui
Hongyan Liu
Affiliation:
Laboratory for Earth Surface Processes, Department of Geography, Peking University, Beijing, 100871, People's Republic of China
Lihong Xu
Affiliation:
Laboratory for Earth Surface Processes, Department of Geography, Peking University, Beijing, 100871, People's Republic of China
Haiting Cui
Affiliation:
Laboratory for Earth Surface Processes, Department of Geography, Peking University, Beijing, 100871, People's Republic of China
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Abstract

The woodland-steppe ecotone of the southeastern Inner Mongolian Plateau in northern China is located at the northwestern limit of the Pacific monsoon influence, where the landscape may have been a sensitive recorder of past climatic changes. Physical, chemical, and biological analyses of AMS 14C-dated sediment sequences from two lakes of this region were used to reconstruct the Holocene vegetation and desertification history and distinguish four periods: (1) a cold and humid period from 10000 to 8000 14C yr B.P., (2) a warm and humid period from 8000 to 5900 14C yr B.P., (3) a warm and dry period from 5900 to 2900 14C yr B.P., and (4) a cool and dry period from 2900 14C yr B.P. to the present. The increased aridity during the middle Holocene was likely caused by increased winter temperatures and enhanced winter evaporation. The transition from a humid to an arid climate after ∼5900 14C yr B.P. coincided with enhanced aeolian activity, and deciduous woodlands were replaced by pine woodlands and then by steppes in response to the climatic deterioration. These transitions led to the present desertification. The records suggest that a simple association of thermal and moisture conditions, such as warm/wet or cold/dry, may be misleading.

Keywords

landscape developmentmonsoonInner Mongoliawoodlandssteppesecotone, eolianpaleoclimate
Type
Research Article
Information
Quaternary Research , Volume 57 , Issue 2 , March 2002 , pp. 259 - 270
Copyright
University of Washington

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