植物生态学报 ›› 2026, Vol. 50 ›› Issue (2): 244-255.DOI: 10.17521/cjpe.2025.0079  cstr: 32100.14.cjpe.2025.0079

• 研究论文 • 上一篇    下一篇

长期氮添加对北方森林林下植物功能性状的影响

汪子轩1,2,3, 邢爱军1,2, 陈子歆1,2,3, 沈海花1,2,3,*(), 方精云1,4   

  1. 1 中国科学院植物研究所植被与环境变化重点实验室, 北京 100093
    2 国家植物园, 北京 100093
    3 中国科学院大学, 北京 100049
    4 北京大学城市与环境学院, 生态研究中心, 植被结构功能与建造全国重点实验室, 北京 100871
  • 收稿日期:2025-03-10 接受日期:2025-07-09 出版日期:2026-02-28 发布日期:2026-04-01
  • 通讯作者: *沈海花(shen.haihua@pku.edu.cn)
  • 基金资助:
    国家自然科学基金(31988102);国家自然科学基金(32301390)

Effects of long-term nitrogen addition on understory plant functional traits in a boreal forest

WANG Zi-Xuan1,2,3, XING Ai-Jun1,2, CHEN Zi-Xin1,2,3, SHEN Hai-Hua1,2,3,*(), FANG Jing-Yun1,4   

  1. 1 Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
    2 China National Botanical Garden, Beijing 100093, China
    3 University of Chinese Academy of Sciences, Beijing 100049, China
    4 Institute of Ecology, College of Urban and Environmental Sciences, State Key Laboratory for Vegetation Structure, Function and Construction, Peking University, Beijing 100871, China
  • Received:2025-03-10 Accepted:2025-07-09 Online:2026-02-28 Published:2026-04-01
  • Contact: *SHEN Hai-Hua (shen.haihua@pku.edu.cn)
  • Supported by:
    National Natural Science Foundation of China(31988102);National Natural Science Foundation of China(32301390)

摘要:

植物功能性状反映资源获取的权衡机制, 依据性状的组合可将植物划分为资源获取型和资源保守型。氮是植物生长的必需元素, 氮沉降的增加将通过改变生态系统氮循环, 进而对植物性状和资源获取策略产生影响。然而, 有关氮沉降与植物性状和策略的研究多集中于乔木层, 对林下植物群落, 尤其是北方森林中的研究较为匮乏。该研究依托兴安落叶松(Larix gmelinii)林13年的氮添加实验, 从物种和群落水平探讨氮添加对林下植物性状的影响, 并分析植物资源利用策略的变化。研究结果表明, 氮添加促进了获取型植物(如柴桦(Betula fruticosa)和小叶章(Deyeuxia angustifolia))的株高、比叶面积和相对盖度; 而抑制了保守型植物(如越橘(Vaccinium vitis-idaea))的株高、相对盖度和光合速率, 表明氮添加有利于获取型策略植物的生长。在群落水平上, 氮添加显著促进了群落平均性状中的叶氮含量、比叶面积和株高, 显著降低了叶磷含量, 这些群落平均性状的变化主要由种内变异引起。相反, 氮添加并没有显著改变大多数性状的功能分散度, 其变化主要与种间变异有关。更重要的是, 群落性状的变化表明, 氮添加促使北方森林林下植物群落的资源利用策略从保守型转变成获取型。综上所述, 该研究揭示了长期氮添加背景下北方森林林下植物群落资源利用策略的变化及其与植物群落组成和生长响应的关系。

关键词: 北方森林, 氮沉降, 植物性状, 资源利用策略, 种间变异, 种内变异

Abstract:

Aims Plant functional traits reflect the trade-off mechanism for resource acquisition, and plants can be classified as resource-acquisitive and resource-conservative based on their trait combinations. Nitrogen (N) is essential for plant growth, and increased N deposition can affect plant traits and resource acquisition strategies by altering the ecosystem N cycle. However, most studies on the effects of N deposition on plant traits and strategies have focused on the tree layer, with relatively little research on understory plant communities, especially in boreal forests.

Methods This study relied on a thirteen-year of N addition experiments in Larix gmelinii forests to explore the effects of N addition on understory plant traits at the species and community levels, and to analyse changes in plant resource use strategies.

Important findings The results showed that N addition promoted plant height, specific leaf area and relative cover of acquisitive species (e.g. Betula fruticosa and Deyeuxia angustifolia), while it suppressed the plant height, relative cover and photosynthetic rate of conservative plants (e.g. Vaccinium vitis-idaea), suggesting that N addition favoured the growth of plants with acquisitive strategies. At the community level, N addition significantly promoted leaf N content, specific leaf area, and plant height; and significantly reduced leaf phosphorus content in community-weighted mean traits, and these changes were mainly caused by intraspecific variation. In contrast, N addition did not significantly change the functional dispersion of most traits, and these changes were mainly related to interspecific variation. More importantly, the changes in community traits reflect that N addition has shifted in the resource use strategy of boreal forest understory plant communities from conservative to acquisitive. In summary, this study reveals how long-term N addition changes resource use strategies of boreal forest understory plant communities and their relationship with plant community composition and growth response.

Key words: boreal forest, nitrogen deposition, plant trait, resource use strategy, intraspecific variation, interspecific variation