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地理科学  2011 

光释光测年和孢粉分析揭示的晚冰期以来科尔沁沙地演化过程

, PP. 695-701

Keywords: 科尔沁沙地,光释光测年,孢粉分析,沙地演化

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Abstract:

利用光释光测年技术对科尔沁沙地的7个风成砂-砂质古土壤剖面进行年代测试,结合地层和孢粉分析得到晚冰期以来科尔沁沙地的演化过程如下16~10kaB.P.,风成砂出现,沙地活化;10~3kaB.P.,砂质古土壤发育,沙地固定;约3kaB.P.前后,风成砂出现,沙地活化;3kaB.P.至今,多层弱发育砂质古土壤和风成砂的交替出现,指示晚全新世科尔沁沙地的多次固定与活化;从约4~2kaB.P.,沙地环境由草甸草原逐渐退化为典型草原。分析表明,3kaB.P.以前科尔沁沙地的演化完全受气候变化的控制,之后(尤其是辽代以后)人类活动的影响日益增强。

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