甘青地区末次冰消期以来植被与气候演化的孢粉记录对比分析

Vegetation and Climate Changes Based on the Pollen Records in Gansu-Qinghai Area since the Last Deglaciation

中文关键词:  甘青地区  末次冰消期  孢粉纪录  环境变化  A/C值

英文关键词:Gansu-Qinghai area  Last deglaciation  Pollen record  Environmental change  A/C ratio

中文摘要:

      选用甘青地区达连海、青海湖、苏家湾、大地湾4个典型高分辨率的钻孔资料进行对比分析，阐明了该地区末次冰消期以来气候变化规律与主要气候事件，初步探讨了该地区植被纬向时空演化规律。结果显示末次冰消期大致开始于15．2—14．6ka BP之间，冰消期期间该地区气候表现为冷暖波动频繁，气候不稳定，植被类型由东向西为草原-荒漠化草原。全新世早期阶段10．4—8．2kaBP气候表现为温干，植被类型由东向西为疏林草原-草原。全新世中期8．2—4．3kaBP气候温暖湿润，植被发育良好，由东向西出现森林-森林草原植被。4．3kaBP以后该地区气候总体向凉千方向发展，3．9～3．4kaBP期间陇中地区气候波动较显著，植被类型草原-森林草原交替出现。晚全新世后期2．3～0kaBP气候冷干，从东到西发育草原-荒漠化草原植被。

英文摘要:

      The paper analyses the high resolution pollen records of Dalianhai lake, Qinghai lake, Sujiawan and Dadiwan sediment in Gansu-Qinghai area since the last deglaciation. And disscuses the climate change, cold-dry climate incidents and vegetation distribution from east to west in this area. It is shown that the late glacial began between 15.2 - 14. 6 ka BP, the climate was cold and humid during the early period, cold and dry during the late period, and totally unstable;meadows-desert steppe vegetation developod from east to west. In early Holocene the climate was temperate and dry, shrub meadows-meadow appeared in this area. During the middle Holocene climate was warm and wet, conifer and broad-leavod deciduous mixed forest developed. Climate became cold and dry since 3.9 - 3.4 ka BP. In early period climate was relatively warm and wet, meadows-shrub meadow vegetation developed in east of the area;in late period（2. 3 -0 ka BP） climate was dry and cold, vegetation involved to meadows-desert steppe.