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通过对西藏羊湖地区ZK1和卡拉苏代牙剖面(IP16)的孢粉分析和总有机碳(TOC)、元素含量分析等,建立了羊湖地区近1.4万年以来的孢粉组合带、重建当时的植被类型及古气候演变序列。结果显示:该时期经历了5次植被类型的更替,即草原型→疏林草原型→草原型→疏林草原型→草原型,与之相对应的气候经历了5次波动(2个半旋回), 即11 220 a.B.P.左右的第一气候旋回:由干旱→半干旱半湿润转化;8 970a.B.P.左右的第二气候旋回,同样由干旱→半干旱半湿润转化,然后进入半个气候旋回,即干旱气候期,推测今后有可能进入半干旱半湿润气候期。
Based on the sporo-pollen analysis, total organic carbon (TOC) and elemental content analysis of the ZK1 and Karashuode dentification sections (IP16) in the Yanghu Lake region of Tibet, spore-pollen assemblages in the Yanghu area for nearly 14,000 years were established and reconstructed The vegetation types at that time and the sequence of paleoclimate evolution. The results showed that there were five alternations of vegetation types in this period, that is, the steppe → the steppe steppe → the steppe → the steppe steppe → the steppe. The corresponding climate experienced five fluctuations ), Ie, the first climatic cycle around 11 220 aBP: arid → semi-arid semi-humid conversion; the second climatic cycle around 8 970a.BP, also transformed from arid → semi-arid sub-humid and then into half a climatic cycle, That is, arid climate, speculated that the future may enter the semi-arid and semi-humid climate.