基于若尔盖高原湿地唐克剖面孢粉记录的古气候重建  

HOLOCENE POLLEN RECORD IN THE TANGKE PEAT PROFILE OF SICHUAN AND ITS PALAEOCLIMATIC SIGNIFICANCE

作　　者：郭春晓[1] 罗璠[2] 罗传秀[3] 冯甦[1] 孙群[1] 杨志荣[1] 张杰[1] 

机构地区：[1]四川大学生命科学学院生物资源与生态环境教育部重点实验室,成都610064 [2]西南民族大学生命科学与技术学院,成都610041 [3]中国科学院南海海洋研究所,广州510301

出　　处：《古生物学报》2012年第3期351-358,共8页Acta Palaeontologica Sinica

基　　金：国家“十一五”科技支撑计划项目(2007BAC18B02,2007BAC18B03);四川省科技厅重点支持项目(2008SZ0209)联合资助

摘　　要：对青藏高原东北部若尔盖高原湿地唐克泥炭剖面TK1采样点按10cm间距作孢粉分析,依据主要孢粉类型的百分比关系,以及加速器质谱(AMS)14C测年数据,将剖面孢粉组合大致分为上下两个带。在下带,莎草科均在65%—75%之间变化,表明了相当稳定的气候条件。结合若尔盖表土孢粉数据和唐克泥炭剖面孢粉数据,首次定量重建了唐克7940cal.aBP以来的古气候变化规律:7940—6420cal.aBP,年均温0.72—1.48℃,年降水量650.34—662.29mm;6420—3790cal.aBP,年均温0.56—1.62℃,年降水量647.79—662.34mm;3790—1580cal.aBP,年均温0.54—1.65℃,年降水量647.40—657.71mm;1580cal.aBP至现在,年均温1.45—1.73℃,年降水量661.86—666.41mm。相应于气候变化,沼泽发育也依次经历了4个时期变化,即沼泽化过程发展期—沼泽大发展期—沼泽发育波动期—沼泽再度大发展期。The Holocene palynoflora of the Tangke peat section from Zoige on the Zoige plateau of northern Sichuan was analysed in order to reconstruct the palaeovegetation and palaeoclimate. Combined with AMS^14C and data from surface soil pollen material, palaeoclimatic parameters were reconstructed quantitatively. In the basal zone, the content of Cyperaeeae is in the range 65 %-75%, indicating stable climate conditions. It was revealed that from 7 940 cal. a BP, the palaeoclimate parameters were divided into two broad intervals, the basal one made up of the three zones A-C in Text figures 3, 4, the upper one represented by the single zone D.

关 键 词：孢粉分析 定量重建 古气候 全新世 若尔盖高原 

分 类 号：Q914[天文地球—古生物学与地层学]