植物生态学报 ›› 2026, Vol. 50 ›› Issue (4): 859-869.DOI: 10.17521/cjpe.2025.0119  cstr: 32100.14.cjpe.2025.0119

• 研究论文 • 上一篇    下一篇

青藏高原灌丛化与氮添加对土壤线虫群落及功能性状的交互作用

张安宁1, 肖亚宁2, 赵霞2, 张淼1, 崔瀚文2, 陈书燕1,*(), 安黎哲1,3,*()   

  1. 1 兰州大学生命科学学院, 兰州 730000
    2 兰州大学生态学院, 兰州 730000
    3 北京林业大学林木资源高效生产全国重点实验室, 北京 100083
  • 收稿日期:2025-04-02 接受日期:2025-09-09 出版日期:2026-04-20 发布日期:2026-06-25
  • 通讯作者: *陈书燕, chenshy@lzu.edu.cn;
    安黎哲, anlizhe@bjfu.edu.cn
  • 基金资助:
    国家自然科学基金(41830321);国家自然科学基金(32471559);国家自然科学基金(32460262和325B2066);甘肃省自然科学基金(24JRRA433);甘肃省自然科学基金(25JRRE015)

Interactions between shrub encroachment and nitrogen addition on nematode community and functional traits on Qingzang Plateau

ZHANG An-Ning1, XIAO Ya-Ning2, ZHAO Xia2, ZHANG Miao1, CUI Han-Wen2, CHEN Shu-Yan1,*(), AN Li-Zhe1,3,*()   

  1. 1 School of Life Sciences, Lanzhou University, Lanzhou 730000, China
    2 College of Ecology, Lanzhou University, Lanzhou 730000, China
    3 State Key Laboratory of Efficient Production of Forest Resources, Beijing Forestry University, Beijing 100083, China
  • Received:2025-04-02 Accepted:2025-09-09 Online:2026-04-20 Published:2026-06-25
  • Contact: *CHEN Shu-Yan, chenshy@lzu.edu.cn;
    AN Li-Zhe, anlizhe@bjfu.edu.cn
  • Supported by:
    National Natural Science Foundation of China(41830321);National Natural Science Foundation of China(32471559);National Natural Science Foundation of China(32460262);National Natural Science Foundation of China(325B2066);Natural Science Foundation of Gansu Province(24JRRA433);Natural Science Foundation of Gansu Province(25JRRE015)

摘要: 线虫是地下生物群落的重要组成部分, 在维持生态系统结构与功能中起着至关重要的作用。全球环境变化, 如灌丛化和氮沉降, 已成为生物群落结构和功能变化的重要驱动因素。不同环境因子会共同影响生物多样性, 而灌丛化和氮沉降间的交互作用对土壤线虫功能多样性的影响尚不清晰。该研究在青藏高原东缘开展了灌木移除和氮添加的控制实验, 使用核密度N维超体积法计算线虫功能多样性, 探究线虫对灌木、氮沉降及其交互作用的响应。结果表明: (1)灌木显著增加了线虫物种多样性并改变了其群落组成, 但该效应受氮添加影响较小。(2)灌木显著增加了线虫功能多样性, 而氮添加将削弱灌木对功能多样性的促进作用。(3)灌木改变了不同食性线虫多度占比, 显著增加了植食性、食细菌性和食真菌性线虫占比, 但显著降低了捕食性线虫占比。此外, 氮添加加剧了灌木对低营养级线虫的促进作用和对高营养级线虫的抑制作用。(4)相关性和冗余分析(RDA)表明, 植物生物量和土壤水分含量是影响线虫群落组成和功能性状的关键驱动因子。在灌丛化和大气氮沉降背景下, 线虫功能多样性将更加相似。

关键词: 土壤线虫, 功能多样性, 功能性状, 灌木效应, 氮添加, 青藏高原

Abstract:

Aims Nematodes are a key component of belowground communities that maintain ecosystem structure and function. Global environmental changes, such as shrub encroachment and nitrogen deposition, have become key drivers of changes in belowground community structure and function. While multiple environmental factors may jointly influence biodiversity, the interactive effects of shrub encroachment and nitrogen deposition on soil nematode functional diversity remain poorly understood.

Methods In this study, we conducted a controlled experiment involving shrub removal and nitrogen addition on the eastern edge of Qingzang Plateau. We used the kernel density N-dimensional hypervolumes method to calculate nematode functional diversity and explore the response of nematodes to shrubs, nitrogen deposition, and their interactions.

Important findings Shrubs significantly increased nematode taxonomic diversity and altered their community composition, but these effects were less affected by nitrogen addition. Shrubs significantly increased nematode functional diversity, while nitrogen addition mitigated this positive effect. Shrubs altered the abundance proportion of nematodes with different diets, significantly increasing the proportion of herbivorous, bacterivorous, and fungivorous nematodes, but significantly decreasing the proportion of predatory nematodes. Moreover, nitrogen addition exacerbated the positive effects of shrub on lower trophic level nematodes and the negative effects on higher trophic level nematodes. Correlation and redundancy analysis (RDA) indicated that plant biomass and soil moisture were key factors driving nematode community composition and functional traits. Our findings suggest that under future nitrogen deposition and shrub encroachment, nematode functional diversity will become more homogenized.

Key words: soil nematode, functional diversity, functional trait, shrub effect, nitrogen addition, Qingzang Plateau