植物生态学报 >

2025 , Vol. 49 >Issue 12: 2119 - 2136

DOI: https://doi.org/10.17521/cjpe.2025.0182

研究论文

高山灌木扩张梯度下植物叶片与根系酚类物质的响应特征

  • 宋思宇 ,
  • 杜飘 ,
  • 林琴 ,
  • 齐祥 ,
  • 杜柯芋 ,
  • 李聪 ,
  • 陈亚梅 ,
  • 黄尤优 ,
  • 刘洋
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  • 1长江上游森林生态与保育四川省重点实验室, 成都 611130
    2四川农业大学林学院, 成都 611130
    3四川峨眉山森林生态系统国家定位观测研究站, 四川乐山 614000
    4高山生态系统长期定位研究站, 四川阿坝 624000
    5西南野生动植物资源保护教育部重点实验室, 四川南充 637009
*刘洋(sicauliuyang@163.com)，ORCID：0000-0002-4795-9169

收稿日期: 2025-05-20

  录用日期: 2025-08-25

  网络出版日期: 2025-09-23

基金资助

国家自然科学基金(32371850);国家自然科学基金(41901224);四川省科技计划资助项目(2025YFHZ0168)

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Response characteristics of phenolic compounds in plant leaves and roots along an alpine shrub encroachment gradient

  • SONG Si-Yu ,
  • DU Piao ,
  • LIN Qin ,
  • QI Xiang ,
  • DU Ke-Yu ,
  • LI Cong ,
  • CHEN Ya-Mei ,
  • HUANG You-You ,
  • LIU Yang
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  • 1Forest Ecology and Conservation in the Upper Reaches of the Yangtze River Key Laboratory of Sichuan Province, Chengdu 611130, China
    2College of Forestry, Sichuan Agricultural University, Chengdu 611130, China
    3Sichuan Mt. Emei Forest Ecosystem National Observation and Research Station, Leshan, Sichuan 614000, China
    4Long-term Research Station of Alpine Ecosystems, Aba, Sichuan 624000, China
    5Key Laboratory of Southwest China Wildlife Resources Conservation, Ministry of Education, Nanchong, Sichuan 637009, China

Received date: 2025-05-20

  Accepted date: 2025-08-25

  Online published: 2025-09-23

Supported by

National Natural Science Foundation of China(32371850);National Natural Science Foundation of China(41901224);Sichuan Science and Technology Program(2025YFHZ0168)

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摘要

随着气候变化的加剧, 全球高海拔和高纬度地区的灌木扩张现象日益显著。然而, 高山地区灌木扩张过程中植物防御性化学物质(如总酚和缩合单宁)含量的变化规律及其驱动机制尚不明确。该研究以青藏高原东缘的川西高山灌丛-草甸交错带为研究区域, 沿灌木扩张梯度选取对照(盖度0%)、轻度扩张(盖度<30%)、轻中度扩张(盖度30%-45%)、中重度扩张(盖度45%-60%)和重度扩张(盖度>60%)样地, 采用空间代替时间的方法, 分析了灌木扩张对植物防御性化学物质含量的影响及其与环境因子(如海拔、土壤pH、含水量等)的关系。结果表明: (1)灌木扩张显著增加了川西高山灌丛-草甸交错带的灌丛数量、高度、体积和加权密度; (2)与草本植物和红毛花楸(Sorbus rufopilosa)相比, 高山杜鹃(Rhododendron lapponicum)在灌木扩张过程中表现出较高的酚类物质含量; (3)群落水平物种组成的变化对植物酚类物质变异的影响显著高于物种内个体间表型可塑性的种内变异; (4)植物叶片与根系的酚类物质含量均与其碳氮比显著相关, 而土壤因子影响较小, 支持了碳-养分平衡假说。该研究揭示了灌木扩张对植物防御物质的正向影响, 并为全球变化背景下的生态系统管理和植物保护提供了重要的理论依据。

关键词： 灌木扩张; 酚类物质; 种内性状变异; 碳氮比; 碳-养分平衡假说

本文引用格式

宋思宇 , 杜飘 , 林琴 , 齐祥 , 杜柯芋 , 李聪 , 陈亚梅 , 黄尤优 , 刘洋 . 高山灌木扩张梯度下植物叶片与根系酚类物质的响应特征[J]. 植物生态学报, 2025 , 49(12) : 2119 -2136 . DOI: 10.17521/cjpe.2025.0182

Abstract

Aims With the intensification of climate change, shrub expansion or encroachment in high-altitudes and high-latitude has become increasingly significant. However, the patterns and driving mechanisms of changes in plant defensive chemicals such as total phenols and condensed tannins during such shrub expansion processes in alpine regions remain poorly understood.

Methods Taking the alpine shrub-meadow transition zone or ecotone in western Sichuan on the eastern Qingzang Plateau as the study area, sample plots were established along a shrub expansion gradient including control (0% coverage), light expansion (<30% coverage), light-moderate expansion (30%-45% coverage), moderate-heavy expansion (45%-60% coverage), and heavy expansion (>60% coverage). The impact of shrub expansion on the content of plant defensive chemical compounds and their relationships with environmental factors such as altitude, soil pH, and moisture content was analyzed by a space-for-time substitution approach.

Important findings The results showed that: (1) Shrub expansion significantly increased the density, height, volume, and weighted density of shrubs in the alpine shrub-meadow transition zone of western Sichuan; (2) Compared to herbaceous plants and Sorbus rufopilosa, Rhododendron lapponicum exhibited higher levels of phenolic compounds during the shrub expansion process; (3) Changes in species composition at the community level had a significantly greater impact on the variation in plant phenolic compounds than intraspecific variation resulting from phenotypic plasticity among individuals; (4) Concentrations of phenolic compounds in both plant leaves and roots showed significant correlations with their carbon to nitrogen ratios, while soil factors had a relatively minimal effect, supporting the Carbon-nutrient Balance Hypothesis. This study sheds light on the positive impact of shrub expansion on plant defense compounds and provides critically theoretical underpinnings for ecosystem management and plant conservation in the context of global change.

Key words： shrub encroachment; phenolic compounds; intraspecific trait variation; carbon to nitrogen ratio; Carbon-nutrient Balance Hypothesis

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