鲁北平原东部巨淀湖岩心沉积物记录的全新世环境演变  

Holocene environmental evolution recorded by core sediments of Judian Lake in the east of Lubei Plain,Shandong Province

作　　者：邹春辉 赵强 毛龙江[1,3] Zou Chun-Hui;Zhao Qiang;Mao Long-Jiang(Institute of the History of Science and Technology,Nanjing University of Information Science and Technology,Nanjing 210044,China;School of Water Conservancy and Environment,University of Jinan,Jinan 250022,China;College of Marine Science,Nanjing University of Information Science and Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学科学技术史研究院,江苏南京210044 [2]济南大学水利与环境学院,山东济南250022 [3]南京信息工程大学海洋科学学院,江苏南京210044

出　　处：《古地理学报》2020年第6期1209-1220,共12页Journal of Palaeogeography：Chinese Edition

基　　金：国家自然科学基金项目(编号:41771218,41471160)资助。

摘　　要：鲁北平原东部巨淀湖处于中国北方季风区,对全球气候变化响应敏感,为研究海岸带地区过去的气候环境演变提供了丰富的湖泊沉积资料。通过对巨淀湖钻孔岩心沉积物孢粉鉴定、粒度分析和AMS14C年代测定,探讨了鲁北平原地区8900 cal a BP以来的气候环境演变过程。结果表明:8900—7625 cal a BP,气温较高,降水丰沛,气候较暖湿;7625—6810 cal a BP,气候整体呈变凉变干的趋势;6810—4435 cal a BP,温度回升,降水增加,显示了全新世中期整体温暖湿润的气候特征;4435—3150 cal a BP,气候整体寒冷湿润,其间也存在小幅的冷暖波动。中全新世期间5450—5280 cal a BP和4160—4090 cal a BP出现了明显冷干事件,这与中国乃至全球范围内的地质气候记录存在一致性,究其原因可能是受到太阳辐射变化导致的赤道辐合带南移、大洋海表温度变化以及地表植被的反馈作用的共同影响。Judian Lake in the east of Lubei Plain is located in the monsoon area of northern China,which is sensitive to global climate change and provides abundant lake sedimentary data for the study of the past climate and environment evolution in the land-sea interaction area.Based on the sporopollen identification,grain size analysis and AMS 14C dating of core sediments from the drilling hole of the Judian Lake,the evolutional process of climate and environment since 8900 cal a BP in the northern Lubei Plain was discussed.The results show that:8900-7625 cal a BP,the temperature and precipitation increased and the climate changed from cold-dry to warm-wet;7625—6810 cal a BP,the overall climate was becoming cooler and drier;6810—4435 cal a BP,the temperature rose and the precipitation increased,showing an overall warm and humid climate in the middle Holocene;4435—3150 cal a BP,the climate was generally cold and humid with some low-amplitude fluctuations of cold and warm.During the middle Holocene,there were two obvious cold and dry events in 5450—5280 cal a BP and 4160—4090 cal a BP,which was consistent with the geological and climatic records in China and even in the world.It may be due to the southward movement of the equatorial convergence zone caused by the change of solar radiation,the change of ocean surface temperature and the feedback of surface vegetation.

关 键 词：巨淀湖 全新世 粒度 孢粉 环境演变 

分 类 号：P532[天文地球—古生物学与地层学] P941.78[天文地球—地质学]