生物多样性 ›› 2022, Vol. 30 ›› Issue (5): 21414.  DOI: 10.17520/biods.2021414

• 研究报告: 植物多样性 • 上一篇    下一篇

冠层垂直高度对植物叶片功能性状的影响: 以鼎湖山南亚热带常绿阔叶林为例

罗恬1, 俞方圆1,*(), 练琚愉2,3,*(), 王俊杰4, 申健5, 吴志峰1, 叶万辉2,3   

  1. 1.广州大学地理科学与遥感学院, 广州 510006
    2.中国科学院华南植物园退化生态系统植被恢复与管理重点实验室, 广州 510650
    3.南方海洋科学与工程广东省实验室(广州), 广州 511458
    4.深圳大学生命与海洋科学学院, 广东深圳 518060
    5.广东省农业科学院农业资源与环境研究所, 广州 510640
  • 收稿日期:2021-10-16 接受日期:2022-02-18 出版日期:2022-05-20 发布日期:2022-04-20
  • 通讯作者: 俞方圆,练琚愉
  • 作者简介:lianjy@scbg.ac.cn
    * E-mail: yfy@gzhu.edu.cn;
  • 基金资助:
    国家自然科学基金(41901060);中国科学院战略性先导科技专项(XDB31030000)

Impact of canopy vertical height on leaf functional traits in a lower subtropical evergreen broad-leaved forest of Dinghushan

Tian Luo1, Fangyuan Yu1,*(), Juyu Lian2,3,*(), Junjie Wang4, Jian Shen5, Zhifeng Wu1, Wanhui Ye2,3   

  1. 1 School of Geography and Remote Sensing, Guangzhou University, Guangzhou 510006
    2 Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650
    3 Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458
    4 College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, Guangdong 518060
    5 Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640
  • Received:2021-10-16 Accepted:2022-02-18 Online:2022-05-20 Published:2022-04-20
  • Contact: Fangyuan Yu,Juyu Lian

摘要:

植物功能性状能够反映植物对环境变化的响应, 从而影响生态系统功能。叶片是植物功能性状的重要研究对象, 但随着树冠垂直高度的增加, 植物叶片功能性状的变化规律仍不清楚。为了更好地解释植物对所处环境的响应机制, 本研究以鼎湖山南亚热带常绿阔叶林6个优势树种为研究对象, 对这些树种不同冠层高度的叶片比叶面积(SLA)、叶绿素相对含量(SPAD)、叶干物质含量(LDMC)、叶片碳含量(LCC)、叶片氮含量(LNC)、叶片磷含量(LPC)、叶片氮磷比(N : P)、等效水厚度(EWT)、氮平衡指数(NBI)、类黄酮含量(FLAV)共10个功能性状指标进行比较分析。结果表明: (1)随树冠垂直高度的增加, 叶干物质含量、类黄酮含量、等效水厚度和叶片磷含量呈增加趋势, 比叶面积和氮平衡指数呈减小趋势; 在冠层垂直方向上, 类黄酮含量与氮平衡指数、比叶面积与等效水厚度呈极显著负相关, 叶片氮含量与叶片磷含量呈极显著正相关。(2)不同树种叶片功能性状差异显著, 可能受植物自身特性和群落树种演替进程的影响。(3)叶片功能性状的种内差异沿垂直层次呈现不同的变化趋势。其中, 67%的树种的类黄酮含量随树冠垂直高度增加而显著增加, 67%的树种的氮平衡指数随树冠垂直高度增加而显著减小。南亚热带常绿阔叶林不同树种叶片功能性状随树冠垂直高度增加产生的变化, 反映了植物对光环境的适应以及对水资源和能量利用的不同策略。

关键词: 鼎湖山塔吊样地, 植物功能性状, 优势树种, 垂直结构, 物种共存

Abstract

Aims: Plant functional traits, which reflect the adaptation mechanisms of plants to their environment, are important for ecosystem function. Leaves are the main photosynthetic organs of plants and the primary research object of functional traits. However, there are few studies about the variation of leaf functional traits with the increase of canopy vertical height. Taking a lower subtropical evergreen broad-leaved forest of Dinghushan as example, our study aims to detect the changes of leaf functional traits with the canopy vertical height, and explore the influence of canopy vertical height on leaf functional traits.

Methods: Six dominant species from a subtropical evergreen broad-leaved forest in the Dinghushan National Nature Reserve and a total of 10 leaf functional traits of these species at different canopy heights were compared and analyzed in this study. Leaf functional traits include specific leaf area (SLA), chlorophyll relative content (SPAD), leaf dry matter content (LDMC), leaf carbon content (LCC), leaf nitrogen content (LNC), leaf phosphorus content (LPC), leaf N : P (N : P), equivalent water thickness (EWT), nitrogen balance index (NBI), and flavonoids content (FLAV).

Results: The results revealed that: (1) With the increase of canopy vertical height, LDMC, FLAV, EWT, and LPC exhibited an increasing trend, while SLA and NBI exhibited a decreasing trend. There was a significant correlation between leaf traits and vertical height, as exemplified by FLAV and NBI, SLA and EWT with a negative correlation, while LNC and LPC were positively correlated. (2) Leaf traits showed significant discrepancy among different tree species, which might be affected by the plant’s own characteristics and the succession process of species in the community. (3) The intraspecific variation of leaf traits demonstrated different trends along vertical layers. With the increase of canopy vertical height, 67% of species displayed a significant increase in FLAV, while the NBI of 67% of species decreased significantly.

Conclusion: The variation of leaf traits with the increase of canopy vertical height in the subtropical evergreen broad-leaved forest reflects the adaptation of plants to the light environment and the utilization of water resources and energy.

Key words: Dinghushan tower crane plot, plant functional traits, dominant plants, vertical structure, species coexistence