Environmental change in Bashang Region historical periods

The Bashang region is a typical vulnerable eco-environmentalzone. Our analysis of paleodunes, paleosol profiles, and lake changes taking place during last ten thousands years indicated that:(1) 10-6.9 ka B.P. was a post-glacial temperature-increasing stage, in which lakes had their high water level; (2) 6.9-3.0 ka B. P. was a large warm stage, during which four paleosol layers were developed and climate fluctuation has assumed 4-5 smallcold-humid and cold-dry alternations. Since 5.4 ka B.P, the lakestended to gradually shrink; and by 2.1 ka B.P., water level has fallen by 2.7 m; (3) since 3.0 ka B. P. a general trend of the region was to change into a dry, warm-dry and cold-dry environment.

作 者： SHENG Xue-bin SUN Jian-zhong Liu Yun-xia FENG Jiang-bin   作者單位： SHENG Xue-bin,SUN Jian-zhong,Liu Yun-xia(Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences,)

FENG Jiang-bin(Research Institute of Environmental Conservation Science of Beijing,) 

刊 名： 環(huán)境科學學報(英文版)  ISTIC SCI 英文刊名： ENVIRONMENTAL SCIENCES  年，卷(期)： 2001 13(2)  分類號： X171  關(guān)鍵詞：  

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