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地球科学进展  2012, Vol. 27 Issue (3): 284-291    DOI: 10.11867/j.issn.1001-8166.2012.03.0284
综述与评述     
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
李朝柱1,张晓2,许元斌2,饶志国2*
1.中国地质科学院地质力学研究所,北京100081;
2.兰州大学西部环境教育部重点实验室,甘肃兰州730000
Reviews on the Reconstructed C3/C4 Variations since the Late Miocene in the Chinese Loess Plateau
Li Chaozhu1, Zhang Xiao2, Xu Yuanbin2, Rao Zhiguo2
1.Institute of Geomehanics, Chinese Academy of Geological Sciences, Beijing100081, China;2. Key Laboratory of Western China′s Environmental Systems, Ministry of Education, Lanzhou University, Lanzhou730000, China
 全文: PDF(1460 KB)  
摘要:

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。

关键词: 黄土高原晚中新世以来C3/C4植物碳酸盐动物化石有机质    
Abstract:

 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/C4variations since the Late Miocene in the Chinese Loess Plateau clear.

Key words: Chinese Loess Plateau    Since the Late Miocene    C3/C4 abundance    Carbonate    Animal fossil    Organic matter
收稿日期: 2011-09-18 出版日期: 2012-03-10
:  P59  
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.

通讯作者: 饶志国(1978-),男,湖南长沙人,副教授,主要从事地球化学与第四纪地质研究.       E-mail: raozhg@lzu.edu.cn
作者简介: 李朝柱(1979-),男,云南昆明人,助理研究员,主要从事第四纪地质研究. E-mail:lichzh@163.com
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引用本文:

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.

Li Chaozhu, Zhang Xiao, Xu Yuanbin, Rao Zhiguo. Reviews on the Reconstructed C3/C4 Variations since the Late Miocene in the Chinese Loess Plateau. Advances in Earth Science, 2012, 27(3): 284-291.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2012.03.0284        http://www.adearth.ac.cn/CN/Y2012/V27/I3/284

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