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黄土高原地区晚中新世以来陆地植被C3/C4植物相对丰度演化研究进展

DOI: 10.11867/j.issn.1001-8166.2012.03.0284, PP. 284-291

Keywords: 黄土高原,晚中新世以来,C3/C4植物,碳酸盐,动物化石,有机质

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Abstract:

晚中新世以来陆地生态系统中C3/C4植物相对丰度的演化历史是国际地学界关心的热点问题。我国黄土高原地区也有数个剖面开展了相关的研究,然而基于土壤碳酸盐碳同位素的研究结果在C4植物扩张开始的时间、过程、区域和全球一致性、C4植物相对丰度的空间梯度等主要的地质历史事实以及该区域C4植物扩张的主要驱动因素等方面的认识均存在较大的差异,这可能表明了代用指标本身存在的问题。而来自动物化石的碳同位素研究结果与碳酸盐碳同位素研究结果同样差异比较大,认为直到第四纪时期,C4植物才成为区域植被当中一个重要组分。从代用指标可靠性以及时间分辨率2个方面考虑,建议在后续的研究工作中,大力加强有机质碳同位素方面的研究,进一步查明黄土高原地区晚中新世以来C4植物扩张的历史和可能的驱动机制。

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