title: Environmental change in Bashang region historical periods.
abstract: 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.
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
authors.forename: X B
authors.initials: XB
authors.lastname: Sheng
authors.forename: J Z
authors.initials: JZ
authors.lastname: Sun
authors.forename: Y X
authors.initials: YX
authors.lastname: Liu
authors.forename: J B
authors.initials: JB
authors.lastname: Feng
mesh_terms: D000383:Agriculture; D005075:Biological Evolution; D002681:China; D002980:Climate; D004602:Elements; D004777:Environment; D005618:Fresh Water / Q000737:chemistry; D019015:Geologic Sediments / Q000032:analysis; D010944:Plants / Q000737:chemistry; D012987:Soil / Q000032:analysis; D013696:Temperature; D013997:Time Factors
chemical_list: D004602:Elements; D012987:Soil