关键词: 孟津, 中全新世, 环境变化, 人类活动

Abstract: A holocene paleosol-loess sediment profile and lacustrine sediment profile were found in Mengjin, Henan province. The authors investigated the stratum in this area and analysed samples from the paleosol-loess sediment profile to study middle Holocene environmental change in Mengjin as well as its impact on human activity. Based on particle-size analysis and magnetic susceptibility, CaCO₃ measurement of the paleosol-loess sediment profile, together with the comparison between the paleosol-loess sediment profile and the lacustrine sediment profile, it was concluded that during 5660-7020aBP and 3755-4610aBP, an ancient lake and paleosol were formed in this area, climate was wet and warm; The climate fluctuated during 4610-5660aBP, the ancient lake shrank to sporadic bogs, and the paleosol ceased to develop; During 3055-3755aBP, the ancient lake shrank and dried up, and loess began to accumulate, the climate turned to cold and dry. Human began to lived on the paleosol during late Henan Longshan period, because the lake level was high in this period; During Erlitou period, however, as the ancient lake withered away, human activities expanded gradually to lower land; when the ancient lake dried up, human became to live on lacustrine sediment.

Key words: Mengjin, Middle Holocene, environmental change, human activity