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J Integr Plant Biol, 2003, 45 (11): 1291-1296, Research Article
No C4 Plants Found at the Haibei Alpine Meadow Ecosystem Research Station in Qinghai, China: Evidence from Stable Carbon Isotope Studies
YI Xian-Feng *, YANG Yue-Qin, ZHANG Xiao-Ai, LI Lai-Xing, ZHAO Liang
doi:
Abstract

Using the measurement of stable carbon isotopes in leaves as a tool to investigate photosyn-thetic pathway of 102 plant species grown at an alpine meadow ecosystem, at the foot of the Qilian Mountain, Qinghai, China. The results indicate that the δ13C values of plants have a narrow range from -28.24 to -24.84 , which means that none of the species examined belongs to C4 and crassulaceous acid metabolism (CAM) photosynthetic pathway and all of these species perform photosynthesis through the C3 pathway. This is likely due to a long-term adaptation to environments at the alpine meadow ecosystem.

海北高寒草甸生态系统研究定位站没有发现C 4 植物——来自于稳定性碳同位素的证据
易现峰 杨月琴  张晓爱  李来兴  赵 亮
(1 . 中国科学院兰州地质研究所气体地球化学国家重点实验室,兰州 730000;
2.中国科学院西北高原生物研究所,西宁 810001)


摘要: 通过对海北高寒草甸生态系统研究站25个科、70个属、102种植物叶片的稳定性碳同位素的测定,以确定植物群落的光合型。结果表明,所测定的102种植物的稳定性碳同位素比值(δ13C)介于-28.24‰ 和-24.84‰ 之间,说明这102种植物均属于C3植物,无C4植物或CAM植物。植物这种光合型的分布与该生态系统中的环境因子密切相关,是低温、强辐射等环境因素长期作用的结果,也反映了植物对这种特殊环境的适应。
关键词: δ13C;光合途径;高寒草甸;青藏高原

通讯作者。 现在地址:中国科学院西北高原生物研究所,西宁 810001。E-                       mail:<yxfeng1975@sohu.com>。

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