植物生态学报 >

2025 , Vol. 49 >Issue 9: 1515 - 1526

DOI: https://doi.org/10.17521/cjpe.2024.0383

研究论文

藏东南色季拉山高山树线乔灌地上-地下养分分配策略

  • 陈刚刚 ,
  • 朱思洁 ,
  • 郭亮娜 ,
  • 付芳伟 ,
  • 刘昱灼 ,
  • 李江荣
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  • 1西藏农牧学院高原生态研究所, 西藏林芝 860000
    2中国科学院青藏高原研究所, 北京 100101
    3西藏农牧学院西藏高原森林生态教育部重点实验室, 西藏林芝 860000
    4西藏林芝高山森林生态系统国家野外科学观测研究站, 西藏林芝 860000
    5西藏自治区高寒植被生态安全重点实验室, 西藏林芝 860000
*李江荣 (ljrong06@xza.edu.cn)

收稿日期: 2024-10-26

  录用日期: 2025-03-21

  网络出版日期: 2025-03-21

基金资助

西藏自治区科技计划项目(XZ202301JD0001G)

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Aboveground and belowground nutrient allocation strategies for trees and shrubs at alpine treeline in Sygera Mountains of the southeastern Qingzang Plateau

  • CHEN Gang-Gang ,
  • ZHU Si-Jie ,
  • GUO Liang-Na ,
  • FU Fang-Wei ,
  • LIU Yu-Zhuo ,
  • LI Jiang-Rong
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  • 1Research Institute of Xizang Plateau Ecology, Xizang Agricultual & Animal Husbandry University, Nyingchi, Xizang 860000, China
    2Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
    3Key Laboratory of Forest Ecology in Xizang Plateau, Ministry of Education, Xizang Agricultual & Animal Husbandry University, Nyingchi, Xizang 860000, China
    4National Field Scientific Observation and Research Station for Alpine Forest Ecosystems in Nyingchi, Xizang, Nyingchi, Xizang 860000, China
    5Key Laboratory of Alpine Vegetation Ecological Security in Xizang, Nyingchi, Xizang 860000, China

Received date: 2024-10-26

  Accepted date: 2025-03-21

  Online published: 2025-03-21

Supported by

Xizang Autonomous Region Science and Technology Plan Project(XZ202301JD0001G)

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摘要

通过探究藏东南色季拉山高山树线优势树种方枝柏(Juniperus saltuaria)及雪层杜鹃(Rhododendron nivale)灌木在不同互作强度下的植物体地上-地下养分分配策略, 为该地区的生态保护及生态修复提供理论依据及支持。该研究以色季拉山高山树线方枝柏群落(乔木层盖度60%)、方枝柏优势的群落(乔木层盖度20%)、雪层杜鹃优势的群落(灌木层盖度56%)、雪层杜鹃群落(灌木层盖度75%)为研究对象, 于2022年8月采集4种植物群落中的优势种的叶、根及树冠范围内的土壤, 测定所得样品的养分元素含量, 通过生态化学计量及偏最小二乘法路径模型(PLS-PM)分析不同互作强度下的方枝柏、雪层杜鹃地上-地下养分及化学计量特征变化, 进而明确色季拉山高山树线地区两种优势乔灌植物在不同互作强度下的养分策略差异。结果显示: (1)方枝柏群落叶片碳(C)含量高于方枝柏优势群落, 氮(N)、磷(P)、钾(K)含量则相反; 方枝柏群落根系C含量低于方枝柏优势群落, N、P、K含量则相反。雪层杜鹃优势群落叶片C、K含量高于雪层杜鹃群落, N、P含量则相反; 雪层杜鹃优势群落根系C、N含量高于雪层杜鹃群落, P、K含量则相反; 4种植物群落叶片C、N、P、K含量远高于根系。(2)与方枝柏群落相比, 方枝柏优势群落更偏好将养分输送至叶片, 这种养分策略属激进类型; 与雪层杜鹃群落相比, 雪层杜鹃优势群落则将养分更多地输送至根系, 这种养分策略显得较为保守。研究区植物群落对土壤养分存在正向作用机制。

关键词： 高山树线; 乔灌互作; 养分策略权衡; 生态化学计量; 植物群落; 养分限制

本文引用格式

陈刚刚 , 朱思洁 , 郭亮娜 , 付芳伟 , 刘昱灼 , 李江荣 . 藏东南色季拉山高山树线乔灌地上-地下养分分配策略[J]. 植物生态学报, 2025 , 49(9) : 1515 -1526 . DOI: 10.17521/cjpe.2024.0383

Abstract

Aims By investigating aboveground and belowground nutrient allocation strategies of dominant tree species (i.e., Juniperus saltuaria and Rhododendron nivale) under different interaction intensities at the alpine treeline of Sygera Mountains, we aim to provide theoretical basis and support for ecological protection and restoration for alpine zone.
Methods This study focuses on the J. saltuaria community (Canopy coverage of the arbor layer: 60%), the J. saltuaria dominated community (Canopy coverage of the arbor layer: 20%), the R. nivale dominated community (Coverage of the shrub layer: 56%), and the R. nivale community (Coverage of the shrub layer: 75%) at the alpine treeline of Sygera Mountains. In August 2022, leaves, roots, and soil within the canopy range of dominant species in these four plant communities were collected. The nutrient element content of the samples was measured, and the aboveground and belowground nutrient and other stoichiometric characteristics of J. saltuaria and R. nivale under different interaction intensities were analyzed using ecological stoichiometry and Partial Least Squares Path Model (PLS-PM). We aimed to clarify the differences in nutrient strategies of the two dominant tree and shrub species under varying interaction intensities at the alpine treeline of Sygera Mountains.
Important findings The results showed that (1) leaf carbon (C) content in the J. saltuaria community was higher than that in the J. saltuaria dominated community, while nitrogen (N), phosphorus (P), and potassium (K) contents were opposite; root C content in the J. saltuaria community was lower than that in the J. saltuaria dominated community, while N, P, and K contents were higher. In the R. nivale dominated community, leaf C and K contents were higher than those in the R. nivale community, whereas N and P contents were lower; root C and N contents were higher in the R. nivale dominated community, while P and K contents were lower. In all four plant communities, leaf C, N, P, and K contents were significantly higher than in roots. (2) Compared to the J. saltuaria community, the J. saltuaria dominated community preferred to allocate more nutrients to leaves, representing an aggressive nutrient strategy. In contrast, the R. nivale dominated community transported more nutrients to roots compared to the R. nivale community, reflecting a more conservative nutrient strategy. Additionally, a positive feedback mechanism exists between plant communities and soil nutrients in the study area.

Key words： alpine treeline; tree-shrub interaction; nutrient allocation strategy; ecological stoichiometry; plant community; nutrient restriction

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