天山中段植物叶片碳氮磷化学计量及其海拔变化特征  

Leaf C,N and P Chemometries and Their Altitudinal Variations in the Central Tianshan Mountains

作　　者：杨思琪 赵旭剑 森道 沈海花[3] 韩文轩 

机构地区：[1]中国科学院新疆生态与地理研究所干旱区生物地理与生物资源重点实验室,新疆乌鲁木齐830011 [2]中国农业大学资源与环境学院生态科学与工程系,北京100193 [3]中国科学院植物研究所植被与环境变化国家重点实验室,北京100093

出　　处：《干旱区研究》2017年第6期1371-1379,共9页Arid Zone Research

基　　金：科技部国家重点基础研究发展计划项目(2014CB954202);中国科学院"西部之光"人才培养引进计划;新疆自治区高层人才引进项目;国家自然科学基金(41173083)资助

摘　　要：海拔影响生态系统的生物地球化学过程和格局等诸多性质。研究干旱区植物叶片碳氮磷化学计量特征及其与海拔的关系,有助于揭示干旱区生态系统化学计量特征的空间格局变化规律,并预测其对全球变化的响应。通过对天山南北植物叶碳(C)氮(N)磷(P)计量特征的比较研究,分析海拔对其的影响。结果表明:天山中段植物叶C、N和P的平均含量分别为(414.3±47.3)、(21.4±8.1)、(1.39±0.64)mg·g-1,叶C∶N、C∶P和N∶P的均值分别为18.7±7.3、288.6±133.9、15.4±5.8。天山以北和天山以南的叶N含量和C∶N差异不显著,天山以北的叶C和P含量显著大于天山以南,而叶C∶P和N∶P显著小于天山以南。相关分析表明天山以北和以南的叶C与N、P、N∶P无显著相关,天山以北的叶C与C∶P无显著相关,其余元素及其比值之间均显著相关。随着海拔升高,天山南北植物的叶化学计量特征表现出相似的变化趋势:叶P含量升高,而叶C含量和C∶P、N∶P降低;但叶N含量与海拔间无显著的线性关系。Altitude is an important driver on the spatial pattern of plant nutrient stoichiometry,and closely related to plant physiological processes and regional biogeochemical cycles. Study on the relationship between altitude and plant leaf nutrient stoichiometry contributes to forecast responses to global change. In this study,we explored the leaf C,N and P stoichiometric characteristics and their relationship with altitude in the north and south areas of the Tianshan Mountains. The results showed that average leaf C,N and P concentrations in the central Tianshan Mountains were（414. 3 ± 47. 3）,（21. 4 ± 8. 1） and（1. 39 ± 0. 64） mg·g-1,and the average leaf C∶N,C∶P and N∶ P were 18. 7 ± 7. 3,288. 6 ± 133. 9 and 15. 4 ± 5. 8,respectively. Leaf C and P concentrations were significantly higher in the north than those in the south of the Tianshan Mountains,but leaf C∶ P and N∶ P were significantly lower in the north than those in the south. There was no significant difference in leaf N and C∶ N between the two parts of the mountains. Nutrients and their ratios were significantly correlated with each other,except for C vs. C∶ P in the north and C vs. N,P and N∶ P in both parts. Leaf nutrients showed the similar altitudinal trends in plants sampled from both sides of the Tianshan Mountains： leaf P increased,and leaf C,C∶ P and N∶ P decreased with increasing altitude; but there was no significant linear relationship between leaf N and altitude in the study area. It was suggested that the different hydrothermal conditions and decoupling between elements contribute to the spatial patterns of leaf C,N and P stoichiometry at the two sides and along the altitudinal gradient of the Tianshan Mountains.

关 键 词：植物叶片 化学计量 海拔 养分参数 天山 

分 类 号：Q948.1[生物学—植物学]