The significance of lake sediments geochemistry in environmental reconstruction of south Hongshan Lake, northwestern Tibetan Plateau During the past 150 years

摘要

A 107cm piston-core (SHC-2) was drilled at the site with water depth of 5m in south Hongshan Lake, northwest Tibet in 1998. Based upon the 0.72cm/a of modern sedimentary rate that was tested by 210_Pb method and also calibrated by 137_Cs method as well as the lcm interval sample cutting level, a lake sedimentary record of 150-yr old and with a resolution of 1.4 yrs was obtained.