内蒙古黄旗海全新世中晚期环境演变的沉积记录

Middle-Late Holocene Environmental Changes Recorded by Lacustrine Sediments from Huangqihai Lake,Inner Mongolia

通过对内蒙古中部黄旗海湖泊沉积特征、粒度及孢粉组合等指标的综合分析,重建了该地区全新世中晚期以来的环境变化过程,将黄旗海4360 a BP以来气候环境变化分为7个阶段,其中有三次显著的干冷事件分别发生在2400-2140 a BP,1510-1270 a BP和590-280 a BP期间;三次较温暖湿润时期为3840-2400 a BP,2140-1510 a BP,1270-590 a BP。与区域上全新世晚期以来的环境演变过程基本一致。

Based on the analyses of sedimentary character,grain size,and pollen-spore assemblage of Huangqihai Lake,Inner Mongolia,the climatic and environmental change sequence since middle-late Holocene was reconstructed.Seven climatic and environmental change phases have been identified during the last 4360 a BP.The results showed that there were three cold periods： 2400-2140 a BP,1510-1270 a BP,and 590-280 a BP,and three warm periods： 3840-2400 a BP,2140-1570 a BP and 1270-590 a BP.These events are consistent with those happened in other parts of the north China area.