植物生态学报 ›› 2017, Vol. 41 ›› Issue (4): 461-470.doi: 10.17521/cjpe.2016.0231

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鄱阳湖沙山单叶蔓荆不同器官碳、氮、磷化学计量特征

周红艳1, 吴琴1, 陈明月1, 匡伟1, 常玲玲1, 胡启武1,2,*()   

  1. 1江西师范大学地理与环境学院, 南昌 330022
    2鄱阳湖湿地与流域研究教育部重点实验室, 南昌 330022
  • 收稿日期:2016-07-05 接受日期:2017-02-14 出版日期:2017-04-10 发布日期:2017-05-19
  • 通讯作者: 胡启武 E-mail:huqiwu1979@gmail.com
  • 基金资助:
    江西省教育厅科技落地计划项目“鄱阳湖沙化土地与水土流失治理技术推广与示范”;国家自然科学基金(31460129和31600371)

C, N and P stoichiometry in different organs of Vitex rotundifolia in a Poyang Lake desertification hill

Hong-Yan ZHOU1, Qin WU1, Ming-Yue CHEN1, Wei KUANG1, Ling-Ling CHANG1, Qi-Wu HU1,2,*()   

  1. 1School of Geography and Environment, Jiangxi Normal University, Nanchang 330022, China
    and
    2Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education (Jiangxi Normal University), Nanchang 330022, China
  • Received:2016-07-05 Accepted:2017-02-14 Online:2017-04-10 Published:2017-05-19
  • Contact: Qi-Wu HU E-mail:huqiwu1979@gmail.com

摘要:

在鄱阳湖湖滨沙山沿沙化梯度测定了单叶蔓荆(Vitex rotundifolia)花、叶、枝条、匍匐茎、细根的碳(C)、氮(N)、磷(P)含量, 以阐明单叶蔓荆各器官C、N、P含量及化学计量比的分配格局, 探讨养分元素及其化学计量之间的关联及对沙化程度的响应。结果表明: (1)单叶蔓荆各器官C、N、P含量变化范围分别为386.28-449.47 mg·g-1、11.40-25.37 mg·g-1、0.89-1.54 mg·g-1。各器官中以花的N、P含量最高。(2)沙化程度仅对C、N含量及C:P影响显著, 而器官是影响单叶蔓荆C、N、P含量及化学计量比的主导因子; 单叶蔓荆基于质量的N、P含量之间的关系在不同沙化程度区未发生策略位移现象, N:P化学计量比具有保守性特征, 没有随沙化程度与器官的改变而发生显著变化。(3)单叶蔓荆各器官的相关性主要集中在地上部分, 其中枝条与匍匐茎之间的关系最为密切, 二者之间的C、N、P含量及C:N、C:P化学计量比均表现为显著性相关。

关键词: 鄱阳湖, 沙山, 植物器官, 养分, 化学计量比

Abstract:
Aims The objectives were to clarify the responses of C, N and P stoichiometry of Vitex rotundifolia to desertification, and determine the C, N and P stoichiometric relationships among the organs.
Methods In this study, different organs (e.g. flowers, leaves, twigs, creeping stems, fine roots) of V. rotundifolia were sampled along a desertification gradient in a typical Poyang Lak sandy hill. Subsequently, C, N and P contents of various organs were measured.
Important findings The results showed nutrient contents in different organs ranged from 386.28 to 449.47 mg·g-1 for carbon, 11.40 to 25.37 mg·g-1 for nitrogen and 0.89 to 1.54 mg·g-1 for phosphorus, respectively. C, N and P contents differed significantly among the five organs. The maximum N and P content were found in flowers, whereas the minimums were observed in twigs and creping stems. Moreover, desertification intensity only significantly affected C, N and C:P. C:N and N:P ratios maintained relatively stable. Except N:P, the other nutrient elements and associated stoichiometry significantly differed among the organs. Hence, organs, rather than desertification intensity mainly controlled the C, N and P content and their stoichiometry variability. Although there was a positive correlation between mass-based N content (Nmass) and P content (Pmass) across the three desertification zones, the Nmass-Pmass relationship in V. rotundifolia did not shift. Irrespective desertification intensity and organs, N:P stoichiometry of V. rotundifolia was well constrained. In addition, significant correlations of C, N and P contents among organs were mainly found in the above-ground parts, especially between twigs and creeping stems.

Key words: Poyang Lake, desertification hill, plant organ, nutrient, stoichiometry