摘要
The Bashang region is a typical vulnerable eco-environmental zone. 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 small cold-humid and cold-dry alternations. Since 5.4 ka B. P, the lakes tended 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.
The Bashang region is a typical vulnerable eco-environmental zone. 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 small cold-humid and cold-dry alternations. Since 5.4 ka B. P, the lakes tended 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.
基金
The National Natural Science Foundation of China(No.49872094andNo.40072097)
