植物生态学报 ›› 2025, Vol. 49 ›› Issue (7): 1128-1143.DOI: 10.17521/cjpe.2024.0165  cstr: 32100.14.cjpe.2024.0165

• 研究论文 • 上一篇    下一篇

北京山区三种林下灌木水力结构、叶片功能性状及其环境适应策略

张箫荻1,*, 王晓霞1,*, 章毓文2, 侯靖雨1, 石骁鹏1, 和璐璐1, 刘亚栋1, 薛柳3, 何宝华3, 段劼1,**()   

  1. 1北京林业大学林学院, 北京林业大学林木资源高效生产全国重点实验室, 北京 100083
    2芬兰赫尔辛基大学大气与地球系统研究所, 农业与林业学院森林科学系, 赫尔辛基 00014, 芬兰
    3北京市西山试验林场管理处, 北京 100093
  • 收稿日期:2024-05-21 接受日期:2024-10-09 出版日期:2025-07-20 发布日期:2024-10-11
  • 通讯作者: **段劼, E-mail: duanjie@bjfu.edu.cn
  • 作者简介:第一联系人:

    *同等贡献

Hydraulic architecture, leaf functional traits and environmental adaptation strategies of three understory shrubs in Beijing mountainous areas

ZHANG Xiao-Di1,*, WANG Xiao-Xia1,*, ZHANG Yu-Wen2, HOU Jing-Yu1, SHI Xiao-Peng1, HE Lu-Lu1, LIU Ya-Dong1, XUE Liu3, HE Bao-Hua3, DUAN Jie1,**()   

  1. 1College of Forestry, State Key Laboratory of Efficient Production of Forest Resources, Beijing Forestry University, Beijing 100083, China
    2Faculty of Agriculture and Forestry, Institute for Atmospheric and Earth System Research, University of Helsinki, Helsinki 00014, Finland
    3Beijing Xishan Experimental Forest Farm, Beijing 100093, China
  • Received:2024-05-21 Accepted:2024-10-09 Online:2025-07-20 Published:2024-10-11
  • About author:First author contact:

    *Contributed equally to this work

摘要:

深入研究3种典型林下灌木物种黄荆(Vitex negundo)、扁担杆(Grewia biloba)和蒙桑(Morus mongolica)木质部水力性状和叶片功能性状, 了解根、茎、枝、叶木质部长距离水分传输系统特征, 可以揭示其对环境的适应策略, 从而为森林植被管理和恢复提供理论依据。该研究通过野外和室内实验测定叶片功能性状(叶面积、净光合速率、叶水势等), 对3种灌木物种的根、茎、枝的木质部解剖结构(导管直径、导管密度等)进行切片观察, 计算水力性状(比导水率、水力脆弱性指数)。研究结果表明: (1) 3种灌木叶片形态、水力及功能性状差异显著; 黄荆叶面积小而比叶质量大, 比叶质量、净光合速率最大; 扁担杆叶脉体积最大、净光合和蒸腾速率最小; 蒙桑叶面积、正午叶水势最大。(2) 3种灌木根、茎、枝木质部导管特征与水力性状差异显著; 黄荆输水效率地上部分大于地下部分; 扁担杆木质部各部位输水效率保持平衡, 抗栓塞性最强; 蒙桑各部位输水效率均保持较高水平, 抗栓塞性最弱。(3)相关性分析表明, 3种灌木木质部水力性状影响着大部分叶片结构性状及水力性状的变化。(4)主成分分析表明, 扁担杆趋向于保守的慢对策, 蒙桑趋向于耗水型的快对策, 黄荆的适应策略介于二者之间。

关键词: 灌木, 水力结构, 木质部, 水分传输, 导管, 叶片功能性状, 适应策略

Abstract:

Aims In-depth research on the hydraulic traits of plant xylem and leaf functional traits would be helpful to reveal their adaptation strategies to the environment, providing a theoretical basis for vegetation management and restoration.
Methods This study focuses on three typical shrub species in the mixed Pinus-Quercus forests of Beijing mountains areas: Vitex negundo, Grewia biloba, and Morus mongolica. Leaf functional traits (e.g., leaf area, net photosynthetic rate, leaf water potential, etc.) are determined through outdoor measurements and indoor experiments, while the xylem anatomical structure of the roots, stems, and branches of the three shrub species (e.g., vessel diameter, vessel density, etc.) is observed through sectioning, and hydraulic traits (e.g., specific hydraulic conductivity, hydraulic vulnerability index) are calculated, so as to understand the plant hydraulic structure and leaf functions and to reveal the adaptation strategies of these three shrub species to the shaded understory environment.
Important findings (1) Significant differences in leaf morphology, hydraulics, and functional traits were observed among the three shrubs; Vitex negundo had smaller leaf area but greater specific leaf mass, with the highest specific leaf mass and net photosynthetic rate; Grewia biloba had the largest vein volume but the lowest net photosynthesis and transpiration rates; Morus mongolica had the largest leaf area and midday leaf water potential. (2) Notable differences were found in the xylem vessel characteristics and hydraulic traits of the roots, stems, and branches of the three shrubs; Vitex negundo’s aboveground water transport efficiency exceeded that of its underground part; Grewia biloba maintained a balanced water transport efficiency across all xylem parts, with the strongest resistance to embolism; Morus mongolica maintained high water transport efficiency in all parts, with the weakest resistance to embolism. (3) Correlation analysis indicated that the xylem hydraulic traits of the three shrubs influence most of the variations in leaf structural traits and hydraulic traits. (4) Principal component analysis reveals that Grewia biloba tends towards a conservative slow strategy, Morus mongolica leans towards a water-consuming fast strategy, and Vitex negundo’s adaptation strategy lies between the former two.

Key words: shrub, hydraulic structure, xylem, water transport, vessel, leaf functional traits, adaptation strategies