中国荒漠植物生态化学计量学特征与驱动因素

The Eco-stoichiometric Characteristics and Driving Factors of Desert Plants in China

化学计量学已成为生态学进行定量分析和研究的热点问题之一.通过对1995-2015年生态化学计量学研究成果的分析,对中国干旱半干旱荒漠生态区、高寒荒漠半荒漠生态区的荒漠植物生态化学计量学特征及其驱动因素已有的研究成果进行了系统研究.结果表明:(1)在荒漠生态系统中,N和P是主要的限制性营养元素,不同生活型植物的C、N、P含量均存在显著差异,C、N、P含量在3种生活型的大小顺序为草本>灌木>乔木;(2)荒漠区主要灌木植物叶片C:N:P化学计量比在整个生长季内的变化规律不同;单个荒漠植物物种叶片C、N含量及C:N的季节变异较小,叶片P含量及C:P和N:P季节变异较大;(3)荒漠植物叶片的生态化学计量学特征会随外界环境的变化而变化,同一生活型的植物也会表现出不同的生态化学计量学特征.该研究以期为维护荒漠生态系统平衡和生态脆弱区生物多样性保护提供理论指导与案例借鉴.

The chemometrics has already become one of the crucial issues of quantitative analysis and research in ecology. This study,by investigating eco-stoichiometric research results from 1995 to 2015 ,carried out a systematic analysis of the existing achievements with eco-stoiehiometric char- acteristics and their driving factors influencing desert plants in arid and semi-arid desert ecological region as well as in alpine desert and semi-arid desert ecological region. The results demonstrated that： 1） In desert ecosystem,N and P were the major limiting nutrient elements,and there are sig- nificant differences in the content of C,N and P in different plant life form （herb〉shrub〉arbor in descending order of content of C,N and P） ; 2） The stoichiometric ratio of C： N：P in the leaves of major shrub plants in desert areas varied in the whole growing season,that is,there was a lower sea- sonal variation for the content of C, N as well as C. N in the leaves of the individual desert plant, while there was a higher seasonal variation in the P content of leaves,C：P and N. P; 3） The eco- stoichiometry characteristics in leaves of desert plants varied according to the environment. Even same plants also showed different eco-stoichiometry characteristics. This studies will provide theo- retical guidance and reference for the maintenance of desert ecosystem balance as well as the protec- tion of the species variety in ecologically fragile zones.