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植物生态学报 >

2017 , Vol. 41 >Issue 1: 126 - 135

DOI: https://doi.org/10.17521/cjpe.2016.0031

研究论文

青藏高原东部窄叶鲜卑花碳、氮、磷化学计量特征

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  • 1中国科学院成都生物研究所, 中国科学院山地生态恢复与生物资源利用重点实验室, 生态恢复与生物多样性保育四川省重点实验室, 成都 610041
    2成都理工大学材料与化学化工学院, 成都 610059
    3西华师范大学生命科学学院, 四川南充 637009
    4中国科学院西北高原生物研究所, 西宁 810008
    5中国科学院青藏高原研究所, 北京 100101
* 通信作者Author for correspondence (E-mail:sunzhiqiang1956@sina.com)

收稿日期: 2016-01-17

  录用日期: 2016-09-21

  网络出版日期: 2017-01-23

基金资助

中国科学院战略性先导科技专项(XDA05050303)、科技部科技基础性工作专项(2015FY110300)、国家自然科学基金(31570476、31400424)和中国科学院西部之光(Y4C2021)

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Stoichiometric characteristics of carbon, nitrogen and phosphorus of Sibiraea angustata shrub on the eastern Qinghai-Xizang Plateau

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  • 1Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China;
    2 College of Material and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China;

    3The School of Life Science, China West Normal University, Nanchong, Sichuan 637009, China

    4Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China
    and
    5Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
KANG Jing-yao(1991-), E-mail: kangjingyao_nj@163.com。

Received date: 2016-01-17

  Accepted date: 2016-09-21

  Online published: 2017-01-23

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摘要

为了探究青藏高原东部窄叶鲜卑花(Sibiraea angustata)灌木不同器官碳(C)、氮(N)、磷(P)含量的分配格局及其生态化学计量特征, 该文采用分层随机抽样方法布设样地, 选择16个窄叶鲜卑花灌丛样地, 分别采集窄叶鲜卑花灌木根、茎、叶、当年枝和果等植物器官样品, 并分析样品C、N、P含量及其计量比。结果表明: C、N、P在不同器官中的含量分别表现为茎>当年枝>果>根>叶; 叶>果>当年枝>茎>根; 果>叶>当年枝>根>茎。窄叶鲜卑花各器官中C含量相对稳定, N、P含量变异系数较大, 在根部的变异系数最大。在不同器官中N:P的范围为7.12-12.41, 其值变化不大, N:P变异系数的最小值在当年枝中, 说明N:P在当年枝中的内稳性较高。在该灌木植物体中C与N之间、C与P之间呈极显著的负相关关系, C对N、P具有稀释作用; N与P呈极显著正相关关系, N与P间具有较好的耦合协同性。分析发现: 窄叶鲜卑花不同器官C、N、P化学计量特征在一定程度上符合内稳态理论和生长速率理论, 其元素分配与器官所执行的功能密切相关; 同时指出在物种水平上应当谨慎使用生态化学计量比来判断养分的限制情况。

关键词： 窄叶鲜卑花; 生态化学计量学; 植物器官; 青藏高原

本文引用格式

贺合亮, 阳小成, 李丹丹, 尹春英, 黎云祥, 周国英, 张林, 刘庆 . 青藏高原东部窄叶鲜卑花碳、氮、磷化学计量特征[J]. 植物生态学报, 2017 , 41(1) : 126 -135 . DOI: 10.17521/cjpe.2016.0031

Abstract

Aims Little is known about the stoichiometric characteristics of carbon (C), nitrogen (N) and phosphorus (P) in plateau shrubs across China. Sibiraea angustata is a typical and representative shrub species on the eastern Qinghai- Xizang Plateau, and exploring its C, N and P distribution patterns and stoichiometric properties in different organs (including root, shoot, leaf, twig and fruit) would help us better understand the mechanisms of C, N and P cycling and balance in the S. angustata dominated shrub ecosystem.
Methods Sixteen sampling sites were selected on the eastern Qinghai-Xizang Plateau by the stratified sampling method. The height and coverage of the dominant shrubs, latitude, longitude and altitude of the sites were recorded. Three 5 m × 5 m plots were selected at each site. At least 128 biological samples of plant organs of S. angustata were collected and measured, respectively. The C and N concentrations of plant samples were analyzed using an elemental analyzer (2400 II CHNS). The P concentration was analyzed using the molydate/ascorbic acid method after H2SO4-H2O2 digestion.
Important findings The C, N and P concentrations of different organs followed the order of: shoot (495.07 g·kg-1) > twig (483.37 g·kg-1) > fruit (480.35 g·kg-1) > root (468.47 g·kg-1) > leaf (466.33 g·kg-1); leaf (22.27 g·kg-1) > fruit (19.74 g·kg-1) > twig (7.98 g·kg-1) > shoot (4.54 g·kg-1) > root (4.00 g·kg-1) and fruit (2.85 g·kg-1) > leaf (1.92 g·kg-1) > twig (0.96 g·kg-1) > root (0.52 g·kg-1) > shoot (0.45 g·kg-1), respectively. The ranges of the coefficient of variation (CV) for C, N and P concentrations were 1.71%-4.44%, 14.49%-25.50% and 11.46%-46.15%, respectively. Specifically, the C concentration was relatively high and stable, and the maximum CV values for N and P were found in roots. The N:P value of different organs varied from 7.12-12.41 and the minimum CV for N:P was found in twig, which indicated that N:P in twig had higher internal stability. In addition, correlation analysis indicated that the C concentration was significantly negatively correlated with N and P concentrations and correlation coefficients were -0.407 and -0.342, respectively. However, N concentration had dramatically positive correlation with P concentration and the correlation coefficient was 0.814. These results also could indicate that the C, N and P stoichiometric characteristics in the S. angustata shrub accorded with the homeostatic mechanism and growth rate hypothesis to some extent, the distributions of C, N and P concentrations were closely related to the function of the organs and it should be prudent to use ecological stoichiometric ratios to judge the condition of nutrient limitation at the species level.

Key words： Sibiraea angustata; ecological stoichiometry; plant organs; Qinghai-Xizang Plateau

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