西藏雅鲁藏布江流域中段砂生槐不同器官C、N、P化学计量特征  

Stoichiometric characteristics of carbon, nitrogen, and phosphorus in Sophora moorcroftiana shrubs in the middle reaches of the Yarlung Zangbo River, Xizang, China

作　　者：张欣茹 崔光帅 左振君 王忠[4,5] 杨柳 张林 ZHANG Xinru;CUI Guangshuai;ZUO Zhenjun;WANG Zhong;YANG Liu;ZHANG Lin(Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China;University of Chinese Academy of Sciences,Beijing 100049,China;College of Urban and Environmental Sciences,Peking University,Beijing 100871,China;College of Life Sciences,Wuhan University,Wuhan 430072,Hubei,China;College of Science,Tibet University,Lhasa 850000,Xizang,China;Key Laboratory of Biological Resources and Biosafety,Institute of Plateau Biology Research,Xizang autonomous region,Lhasa 850000,Xizang,China)

机构地区：[1]中国科学院青藏高原研究所,北京100101 [2]中国科学院大学,北京100049 [3]北京大学城市与环境学院,北京100871 [4]武汉大学生命科学学院,湖北武汉430072 [5]西藏大学理学院,西藏拉萨850000 [6]西藏自治区生物资源与生物安全重点实验室/西藏自治区高原生物研究所,西藏拉萨850000

出　　处：《草业科学》2024年第8期1824-1833,共10页Pratacultural Science

基　　金：西藏自治区基地与人才计划项目(XZ202401JD0025);西藏自治区自然科学基金项目(XZ202301ZR0027G);第二次青藏高原综合科学考察研究项目(2019QZKK0301)。

摘　　要：理解植物各器官化学计量特征的分布格局对于揭示其养分分配策略及生态适应性具有重要意义。砂生槐(Sophora moorcroftiana)在雅鲁藏布江中游地区水土保持的功能发挥中起着重要作用,然而目前对其化学计量特征的研究尚不清楚,在很大程度上限制了人们对其生态适应性以及对气候变化响应机制的理解。基于此,本研究以雅鲁藏布江流域中段代表性灌丛砂生槐为研究对象,在不同区域设置了18个灌丛样地,分别采集叶、枝和根,并分析不同器官样品碳(C)、氮(N)、磷(P)含量及其化学计量比。结果表明:1)不同器官的C、N、P及其化学计量特征存在显著差异,C和N含量在不同器官中的分配分别表现为枝>根>叶和叶>根>枝;P含量在叶中最高,在枝和根中无显著差异。2)叶与枝中的元素含量存在极显著相关性,尤其是N和P,而根中元素与叶和枝的相关性均不强。3)枝中N-P计量幂指数为0.67,叶中为0.65,而在根中N-P关系不显著。砂生槐不同器官C、N、P化学计量特征在一定程度上符合叶片养分含量稳定假说和生长速率假说,叶片中的元素含量相对稳定且N、P含量较高。本研究结果有助于深入理解砂生槐的养分分配策略及其对环境的适应机制,并可为高原灌丛恢复和管理提供理论指导。The stoichiometry of plant organs reveals their nutrient partitioning strategies and ecological adaptability.Sophora moorcroftiana plays an important role in soil and water conservation in the middle reaches of the Yarlung Zangbo River;however, few studies have analyzed its stoichiometric characteristics, which limits our understanding of its ecological adaptability and response mechanisms to climate change. In this study, we collected leaf, branch, and root samples from S. moorcroftiana at 18 sampling sites in the middle reaches of the Yarlung Zangbo River and analyzed carbon (C), nitrogen (N), and phosphorus (P) concentrations and their stoichiometric ratios. The results showed that C ꞉ N ꞉ P stoichiometry was significantly different among the different organs, and the distribution of C and N concentrations were as follows: branch > root > leaf, and leaf > root > branch, respectively;P concentration was the highest in the leaves and not significantly different in the branches and roots. A highly significant correlation was observed between the nutrient concentrations, especially N and P, in the leaves and branches;however, the root concentrations did not correlate strongly with either leaf or branch concentrations. The N vs. P scaling exponent was 0.67 in the branches and 0.65 in the leaves, but not significant in the roots. The C ꞉ N ꞉ P stoichiometry in different organs of S. moorcroftiana was consistent with the hypothesis of stability of leaf nutrient content and growth rate hypothesis to some extent;the nutrient content in the leaves was relatively stable, with high N and P contents. The results of this study enrich our understanding of the nutrient partitioning strategies and adaptation mechanisms of S. moorcroftiana to the environment and provide guidance for shrub restoration and management.

关 键 词：豆科灌木 养分分配 幂指数 地理格局 生态化学计量 

分 类 号：S793.9[农业科学—林木遗传育种]