高山植物叶片δ^(13)C的海拔响应及其机理  

Response of leaf δ^(13)C to altitudinal gradients and its mechanism

作　　者：史作民[1,2] 程瑞梅[1,2] 刘世荣[1,2] 

机构地区：[1]中国林业科学研究院森林生态环境与保护研究所 [2]国家林业局森林生态环境重点实验室,北京100091

出　　处：《生态学报》2004年第12期2901-2906,共6页Acta Ecologica Sinica

基　　金：国家重点基础研究发展规划资助项目 ( G2 0 0 2 CB1115 0 5 ) ;国家自然科学基金面上资助项目 ( 3 0 2 710 71) ;国家"十五"攻关资助项目( 2 0 0 1BA5 10 B0 6) ;国家林业局森林生态环境重点实验室基金 ;中国林业科学研究院基金~~

摘　　要：植物 1 3C的分辨研究已成为植物生态学和全球碳循环研究的核心问题之一。植物 1 3C的分辨是环境和生物因子共同作用的综合结果 ,海拔梯度变化不仅可以造成植物生存环境的变化 ,而且还可以造成植物形态和生理特征的变化 ,因此 ,高山植物 1 3C分辨随海拔的变化为深入揭示植物 1 3C分辨的环境和生物因子的作用机理提供了非常理想的研究条件。在简单介绍植物 1 3C分辨基本理论的基础上 ,对目前国际上高山植物 1 3C分辨的海拔响应研究进行了述评。重点介绍了随海拔变化的大气 1 3C组成、温度、气压、水分等环境因子和植物叶片的气孔导度、羧化效率、氮含量和叶肉细胞导度等生物因子对高山 C3植物 1 3C分辨的影响 ,指出高山植物 1 3C分辨的海拔响应机理仍存在一些不确定性 。Study on ^(13)C discrimination by plants has been becoming one of the core issues in plant ecology and global carbon cycling. The plant ^(13)C discrimination is an integrative result of the interactions of environmental and biological factors. Environmental conditions of alpine plants change with altitude and this may result in morphological and physiological changes of alpine plants as well. So, changes of alpine plant ^(13)C discrimination along with altitude provide an ideal indication for examining the interacting effects of environmental and biological factors on the ^(13)C discrimination by the plants. Based on brief introduction about the basic theory of plant ^(13)C discrimination, the paper systematically reviewed international relevant studies on the response of alpine plant ()^(13)C discrimination to altitudinal gradients and its mechanism. Effects of environmental factors along with altitudinal gradient on alpine plant ^(13)C discrimination were discussed, such as carbon isotope composition of the atmosphere, atmospheric temperature, air pressure and water relations. At the same time, effects of some biological factors were covered as well, such as leaf stomatal conductance (g_s), carboxylation efficiency (CE), N content, and mesophyll conductance (g_m). Although many environmental and biological factors have effects on the alpine plant ^(13)C discrimination, the response of the discrimination to altitudinal gradients can not be solely interpreted by each of their effects. So, there still are some uncertainties on the interpretation of mechanisms of the interacting effects of environmental and biological factors on alpine plant ^(13)C discrimination. The review provides a good knowledge for directing the relevant studies in China.

关 键 词：高山植物 碳同位素比例 海拔响应 叶肉细胞导度 机理 

分 类 号：Q944[生物学—植物学]