中文摘要：

简要介绍了国内外关于植物δ13C对海拔梯度响应规律的研究情况,叙述了植物叶片δ13C对海拔梯度响应的内在机理。重点介绍了随海拔变化的气压、温度、降水（湿度）、光照等环境因子和植物的叶片厚度、比叶重（LMA）、氮含量、气孔密度、气孔导度等生物因子对高山植物δ13C的影响作用。由于各因子的多变性以及之间的相互作用,任何单一因子都不足以决定植物δ13C的最终变化,也不能解释植物δ13C随海拔的变化趋势,这种趋势可能是众多因子综合作用的结果。最后对本领域取得的一些认识和结论进行了总结,并对存在的一些问题以及今后的研究方向提出了一些见解。

英文摘要：

Spatial variability in leaf carbon isotope composition（δ13C）provides an opportunity to evaluate plant-environment interactions and mechanisms of plant responses to different environmental factors,and can be helpful to obtain the paleoclimate information.The variation of leaf δ13C is not only determined by the genetic adaptation,but highly influenced by a series of factors in surrounding environments.Many studies have concluded that leaf δ13C would have a definite varying model,while an increase in leaf δ13C with the altitude has been observed in many plant species.Alpine environmental conditions are characterized as low temperature,low air pressure,low humidity,high irradiation and high wind speed,which result in the corresponding variation in physiological and morphological traits of plants,such as increase in leaf thickness and leaf nitrogen content,and,decrease in leaf height and biomass.This paper reviewed the recent research advances in the response of leaf δ13C to altitudinal gradient,and discussed the inherent mechanisms of this trend from both abiotic and biotic aspects.For the abiotic factors,we emphasized on the effects of air pressure,temperature,precipitation（humidity）and irradiation.For the biotic factors,we discussed mainly the effects of leaf thickness,leaf mass per area,nitrogen content,stomatal density and stomatal conductance.However,variation in δ13C along altitudinal gradient can not be explained by any single factor,it rather may be a result of the interacting effects of many factors.Finally,we summarized the issues need to be solved in this field,and presented several directions for further research.