地质通报2016，Vol.35Issue(6)：953-962,10.
内蒙古查干淖尔湖2000a以来气候环境演变的沉积记录
Sedimentary record of environmental evolution since ca 2000 cal yr B P ago in Qehan Lake, Inner Mongolia
摘要
Abstract
A 97cm long lacustrine section from Qehan Lake, situated in eastern Inner Mongolia, was used to reestablish the environ⁃ment and climate changes since the last 2070cal a BP. The chronological framework was built on seven AMS14C ages. On the basis of pollen-spore characteristics and grain size distribution, three environmental stages can be recognized. From 2070~1150cal a BP, this interval was featured by high total pollen concentration, with the dominance of Artemisia and Chenopodiaceae;lacustrine sediments were mainly composed of silt and each fraction presented quite low amplitudes of increases, indicating the weak hydrological condi⁃tions and high lake level;this period was characterized by a warm, cool and slightly humid climate. During the period of 1150~825cal a BP, the total pollen concentration significantly decreased and the pollen percentages of xerophyte, especially Ephedra, reached the maximum;the coarse particle content showed obviously increase, sugge sting strong hydrodynamic conditions and low lake level;so in this period, the climate was cold and dry,especially from 940cal a BP to 870cal a BP. Since 825cal a BP, the climate mainly tend⁃ed to become warm and slightly humid with the occurrence of cold and dry oscillations. Solar activities might have been the domi⁃nant force that drove the climate changes in Qehan Lake area since 2000 years ago.关键词
2000a/孢粉/粒度/气候变化/查干淖尔/内蒙古Key words
2000a/pollen/grain size/climate change/Qehan Lake/Inner Mongolia分类
资源环境引用本文复制引用
江南,王永,董进,杨劲松,田飞,刘瑾,汤文坤..内蒙古查干淖尔湖2000a以来气候环境演变的沉积记录[J].地质通报,2016,35(6):953-962,10.基金项目
中国地质调查局项目 （）
