河北省文安洼湿地晚全新世环境变迁的孢粉记录

LATE HOLOCENE POLLEN RECORDS OF THE ENVIRONMENTAL CHANGES IN THE WENANWA WETLAND OF HEBEI PROVINCE,NORTH CHINA

通过对河北省文安洼湿地沉积物孢粉组合特征、粒度的综合分析,重建了该地区晚全新世以来气候环境变化过程。研究结果表明,该地区晚全新世以来气候总体由凉湿转变为冷干,具体可以分为3个阶段:3 200-2 010cal.a B.P.以湿润气候为主;2 010-1 280cal.a B.P.气候偏冷干;1 280cal.a B.P.以来气候进一步冷干。小冰期以来(556-160cal.a B.P.),中华卷柏孢子持续高含量,伴随粗颗粒物质>63μm含量的上升,表明小冰期以来,文安洼流域气候波动较大,雨水、干旱、洪水并存。

Based on the comprehensive analysis of pollen,grain size and 14 C dating of the sediments in the Wenanwa wetland of Hebei Province,North China,the regional climate and environmental changes were reconstructed the Late Holocene.The results show that the climate has changed from cool-wet to cold-dry in the region,can be subdivided into three stages.During the first stage,from 3 200 cal.a B.P.to 2 010 cal.a B.P.,it was with moist.The climate gradually turned to cold-dry from 2 010 cal.a B.P.to 1 280 cal.a B.P.during the second stage;and became further cold and dry after 1 280 cal.a B.P.during the third stage.Since the ice age（556-160 cal.a B.P.）,the content of Selaginella sinensis（Desv.）Spring spore has continuously increased,with an increasing coarse particle content（63μm）,which indicates a much fluctuated climate with coexisting drough and floods in this area since the ice age.