收稿日期: 2011-09-18
修回日期: 2012-02-18
网络出版日期: 2012-03-10
基金资助
教育部科学技术研究重点项目“黄土高原中部地区晚中新世以来C3/C4植物相对丰度变化及其驱动机制”（编号：109151）；兰州大学中央高校基本科研业务费自由探索面上项目“秦安大地湾全新世黄土黑碳研究”（编号：lzujbky-2010-117）；中国地质科学院地质力学研究所基本科研业务费项目“EA3000元素分析仪的调试及其在第四纪环境研究中的应用”（编号：DZLXJK200903）资助.
Reviews on the Reconstructed C3/C4 Variations since the Late Miocene in the Chinese Loess Plateau
Received date: 2011-09-18
Revised date: 2012-02-18
Online published: 2012-03-10
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。
李朝柱，张晓，许元斌，饶志国 . 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[J]. 地球科学进展, 2012 , 27(3) : 284 -291 . DOI: 10.11867/j.issn.1001-8166.2012.03.0284
The study of the variations of C3/C4 relative abundance in terrestrial ecosystem since the Late Miocene has been the “hotspot” of international community of geosciences during the past decades. In the Chinese Loess Plateau, several profiles have been studied to get the knowledge of past C3/C4 variations since the Late Miocene in this area. However, stable carbon isotopic data of pedogenic carbonate from this area have many inconsistencies in different aspects, such as: the beginning time of C4 expansion, the process of C4 expansion, the consistency of regional and global C4 expansion, and spatial gradient of C4 relative abundance and the main driven factor of C4 expansion in this area. This may reveal the internal unreliability of carbon isotopic composition of pedogenic carbonate as an indicator of past C3/C4 variations in this area. At the mean time, carbon isotopes of animal fossil from Linxia Basin of this area are remarkably different with carbon isotopes of pedogenic carbonate, which indicated that C4 plants became a significant fraction of local ecosystemm, which only existed in the Quaternary. Considering the reliability and timescale resolution of proxy indicator, we suggest that studies on organic matters should be reinforced in ongoing works in the future, in order to make the fact and driven mechanics of terrestrial C3/C4variations since the Late Miocene in the Chinese Loess Plateau clear.
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