植物生态学报 ›› 2026, Vol. 50 ›› Issue (2): 362-373.DOI: 10.17521/cjpe.2025.0161  cstr: 32100.14.cjpe.2025.0161

• 研究论文 • 上一篇    下一篇

塞罕坝地区优势造林树种叶片化学计量特征及其环境驱动

田地1(), 迟小龙1, 石亮2,*(), 刘宵含1, 赵常提1, 吴梅1, 张玉忠3, 高永亮4   

  1. 1 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 中国科学院地理科学与资源研究所, 北京 100101
    3 内蒙古自治区赤峰市克什克腾旗浩来呼热苏木人民政府林业工作站, 内蒙古赤峰 025349
    4 内蒙古克什克腾旗桦木沟林场, 内蒙古赤峰 025349
  • 收稿日期:2025-05-06 接受日期:2025-11-29 出版日期:2026-02-28 发布日期:2026-04-01
  • 通讯作者: *石亮 (shiliang0330@igsnrr.ac.cn)
  • 基金资助:
    国家重点研发计划(2022YFD2201600);中国科协青年人才托举工程(2021QNRC001)

Stoichiometric characteristics of dominant afforestation tree species and their environmental drivers in Saihanba region

TIAN Di1(), CHI Xiao-Long1, SHI Liang2,*(), LIU Xiao-Han1, ZHAO Chang-Ti1, WU Mei1, ZHANG Yu-Zhong3, GAO Yong-Liang4   

  1. 1 State Key Laboratory of Efficient Production of Forest Resources, Beijing Forestry University, Beijing 100083, China
    2 Institute of Geographic Sciences and Resources, Chinese Academy of Sciences, Beijing 100101, China
    3 Forestry Work Station of Haolaihure Sumu (Sub-district) People’s Government, Hexigten Banner, Chifeng, Nei Mongol 025349, China
    4 Huamugou Forest Farm, Hexigten Banner, Chifeng, Nei Mongol 025349, China
  • Received:2025-05-06 Accepted:2025-11-29 Online:2026-02-28 Published:2026-04-01
  • Contact: *SHI Liang (shiliang0330@igsnrr.ac.cn)
  • Supported by:
    National Key R&D Program of China(2022YFD2201600);Young Elite Scientists Sponsorship Program by the China Association for Science and Technology(2021QNRC001)

摘要:

植物叶片化学计量特征与其光合作用、水分利用等生理生态功能密切相关。同一生境内不同树种的叶片化学计量特征反映出树木对环境养分资源的差异化利用策略。中国塞罕坝地区广布华北落叶松(Larix gmelinii var. principis-rupprechtii)和樟子松(Pinus sylvestris var. mongholica)人工林, 由于人工林传统经营中养分管理等方面的基础薄弱, 导致目前普遍存在生产力低、生态系统服务功能不强等问题。为了从树木养分利用的视角, 为半干旱区人工营林树种选择、生态系统提质增效提供理论依据, 该研究在塞罕坝地区设置野外调查固定样地, 采集了两种优势树种的叶片和土壤样品, 测定了其碳(C)、氮(N)和磷(P)含量及其化学计量比, 结合冗余分析和混合效应模型, 解析了两个树种叶片化学计量特征及其环境驱动。结果表明: 1)华北落叶松林土壤C、N和P含量高于樟子松林, 华北落叶松叶片N和P含量以及N含量相关养分计量比的种内变异均高于樟子松, 而叶片C含量低于樟子松; 2)在叶片化学计量特征的环境因子驱动方面, 土壤养分含量的影响力超过了大气水热因子, 土壤总碳含量解释了其变异的57.39%, 其次是年平均气温, 解释了其变异的15.77%; 3)随年平均气温升高, 华北落叶松叶片P含量下降, C:P和N:P显著上升, 而樟子松叶片化学计量特征无显著变化。可见, 塞罕坝地区的樟子松通过保持相对稳定的叶片N-P计量特征, 在适应胁迫环境时遵循“保守型”策略; 而华北落叶松则依赖较高的叶片N、P浓度和C:P、N:P, 呈现随环境条件而变化的“活跃型/获取型”策略。该研究明确了华北落叶松和樟子松叶片化学计量特征的差异, 为进一步开展养分调控树木生长实验, 解析两树种生理生态过程的养分调控机制提供了理论支撑。

关键词: 华北落叶松, 樟子松, 半干旱区, 叶片化学计量特征, 环境因子

Abstract:

Aims The stoichiometric characteristics of plant leaves are closely linked to their physiological and ecological functions, such as photosynthesis and water-use efficiency. Among tree species within the same habitat, variations in leaf stoichiometry reflect distinct strategies for utilizing environmental and nutritional resources. In China’s Saihanba region, extensive plantations of Larix gmeliniivar. principis-rupprechtii and Pinus sylvestrisvar. mongholica exhibit declining productivity and weakened ecosystem services, largely due to a lack of theoretical knowledge to inform traditional nutrient management. The objective of this study was to clarify the adaptive divergence and driving factors controlling the nutrient-use patterns of the dominant species used for afforestation projects and to use this knowledge to provide scientific guidance for tree species selection and ecosystem enhancement in semi-arid regions.

Methods We established permanent field plots in the Saihanba region and collected leaf and soil samples from both dominant species in these plots to measure their carbon (C), nitrogen (N), and phosphorus (P) content. We used Redundancy analysis (RDA) and mixed-effects models to identify key environmental drivers of variations in their leaf stoichiometry.

Important findings 1) Total soil C, N and P contents in the L. gmeliniivar. principis-rupprechtii forest were higher than those in the P. sylvestris var. mongholica forest. The total N and P contents in the leaves of L. gmeliniivar. principis-rupprechtii, as well as the intraspecific variation in N-related nutrient stoichiometric ratios, were all higher than those of P. sylvestris var. mongholica, while the leaf C content was lower than that of P. sylvestris var. mongholica; 2) In terms of the environmental factors driving the stoichiometric characteristics of leaves, the influence of soil nutrient content surpassed that of atmospheric variables. Total soil C content accounted for 57.39% of the variation, followed by the mean annual air temperature, which explained 15.77% of the variation; 3) With rising mean annual air temperature, leaf P content of L. gmeliniivar. principis-rupprechtiidecreased and leaf C:P and N:P ratios increased significantly. These findings suggest that P. sylvestris var. mongholica adopts a “conservative strategyˮ by maintaining relatively stable leaf N and P concentrations and constant N:P ratios as an adaptation to low-resource environments, while L. gmeliniivar. principis-rupprechtii employs an “active/acquisition strategyˮ characterized by higher N, P concentrations and flexible C:P and N:P ratios responsive to environmental shifts. This study elucidates the stoichiometric divergence between the two tree species, offering a theoretical foundation for future experiments on nutrient regulation and mechanistic exploration of their eco-physiological processes.

Key words: Larix gmelinii var. principis-rupprechtii, Pinus sylvestris var. mongholica, semi-arid region, leaf stoichiometric trait, environmental factor