青藏高原北部植物叶片碳同位素组成特征的环境意义

doi:10.11867/j.issn.1001-8166.2004.05.0749

地球科学进展 ›› 2004, Vol. 19 ›› Issue (5): 749 -753. doi: 10.11867/j.issn.1001-8166.2004.05.0749

所属专题：青藏高原研究——青藏科考虚拟专刊；

青藏高原北部植物叶片碳同位素组成特征的环境意义

刘光x琇 ^1,2;陈拓 ¹;安黎哲 ^1,2;王勋陵 ²;冯虎元 ²

中国科学院寒区旱区环境与工程研究所，甘肃兰州 730000；兰州大学生命科学学院，甘肃兰州 730000

收稿日期:2003-09-02 修回日期:2004-03-18 出版日期:2004-12-20
通讯作者: 刘光琇（1962-），男，甘肃民勤人，项目研究员，主要从事寒区生态环境与全球变化研究. E-mail:E-mail：liugx@ns.lzb.ac.cn

THE ENVIRONMENTAL SIGNIFICANCE OF STABLE CARBON ISOTOPE COMPOSITION OF MODERN PLANT LEAVES IN THE NORTHERN PART OF THE TIBETAN PLATEAU

LIU Guang-xiu ^1,2，CHEN Tuo ¹，AN Li-zhe ^1,2，WANG Xun-ling ²，FENG Hu-yuan ²

1．Cold and Arid Regions Environmental and Engineering Research Institute，Lanzhou 730000,China;2.School of Life Science，Lanzhou University, Lanzhou 730000,China

Received:2003-09-02 Revised:2004-03-18 Online:2004-12-20 Published:2004-10-01

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测定了青藏高原北部13个地点101份草本植物叶片碳同位素组成（δ 13 C值）。研究结果表明，与其它地区相比，青藏高原北部植物叶片δ 13 C值相对较高，并且在海拔 4161 m的西大滩仍有植物δ 13 C值落在C4植物区，说明青藏高原的地理特殊性以及植物适应环境的策略。随海拔的升高，植物叶片δ 13 C值也随之升高，但变化程度具有物种的依赖性。唐古拉山南边植物叶片δ 13 C值明显高于北边植物叶片δ 13 C值，分析表明植物叶片δ 13 C值南北分布的这种格局主要是由降水的差异决定的。

关键词: 植物叶片, 海拔, 碳同位素组成, 青藏高原（北部）

The Tibetan plateau is an important place for global changes studies owing to its ecological fragility and climatic sensitivity. The stable carbon isotope compositions in plant leaves can be used to provide information on the origin of carbon in soil organic matter and paleo-ecological evolutions due to the good relationship between the stable carbon isotope compositions and water use efficiency in plants or plant productivity to some extent. However, the knowledge about the pattern of spatial distribution of stable carbon isotope compositions of plant leaves in the Tibetan plateau is less available.
A total of 101 samples used in this study was collected from 13 sites in the northern part of the Tibetan plateau. The analyzed results show that foliar δ¹³C values in the northern Tibet , with an average of -26．89‰, were higher than other mountain regions in the world. Interestingly, C4 plants were found at the elevation of 4 161 m, where there was usually no C4 species distribution. The foliar δ¹³C values increased with increasing altitude, however, the amplitude of increase was dependent on species. Furthermore, compared with plants grown in the northern part of Tanggula mountains, there were significantly higher δ¹³C values at the southern part. The analysis revealed that the differences of δ¹³C values between the northern and southern part of Tanggula mountains were mainly ascribed to precipitation.

Key words: Carbon isotope composition, The Tibetan plateau, Altitude.

中图分类号:

Q948

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