冰消期以来宣化盆地的植被与环境

在河北省宣化盆地黄家堡附近,作者通过对具有放射性碳测年支持的孢粉剖面的研究,揭示了该区14000aBP以来的植被和气候变化。在14000aBP~9000aBP间,宣化盆地是以油松为主的针阔混交林草原景观,海拔较高的山上还有云杉、冷杉组成的暗针叶林生长,推测当时的气候条件温凉湿润;至9000aBP~2400aBP间,宣化盆地的古植被演变成以蒿为主的草原景观,在水分、土壤条件较好的地方生长着由柳、榆、栎、桦等组成的落叶阔叶林,推测当时的气候温和湿润;2400aBP以后,宣化盆地的植被演变成以藜科为主的荒漠化草原景观,气候以凉干为特征。 

VEGETATION AND ENVIRONMENTAL CHANGES IN THE XUANHUA BASIN OF HEBEI PROVINCE SINCE POSTGLACIAL

With the support of ¹⁴C dating,pollen analysis on Huangjiabu sections in Xuanhua Basin reflect the changes of palaeobotany and palaeoclimate. During 14000~9000aBP the vegetation in the Basin was conifer and broad-leaves forests dominated by Pinus and grassland. In some high mountains,there was coniferous forest composed of Abies and Picea,the climate was cool and wet. In 9000~2400aBP the vegetation changed into grassland dominated by Artemisia,while some deciduous broad-leaves trees such as Salix,Ulmus,Quercus and Betula also grown on some areas with suitable moisture and soil condition,the climate was warm and little dry. After 2400aBP the vegetation became desert grassland dominated by Chenopodiaceae,at the same time,the climate became cool and dry.