植物生态学报 ›› 2024, Vol. 48 ›› Issue (5): 660-674.DOI: 10.17521/cjpe.2023.0244  cstr: 32100.14.cjpe.2023.0244

• 研究论文 • 上一篇    

不同草地类型土壤丛枝菌根真菌群落特征及其驱动因素

陈科宇(), 邢森, 唐玉, 孙佳慧, 任世杰, 张静, 纪宝明*()   

  1. 北京林业大学草业与草原学院, 北京 100083
  • 收稿日期:2023-08-19 接受日期:2023-12-21 出版日期:2024-05-20 发布日期:2023-12-21
  • 通讯作者: (baomingji@bjfu.edu.cn)
  • 基金资助:
    内蒙古自治区科技计划项目(2023KJHZ0021);第二次青藏高原综合科学考察研究项目(2019QZKK0304)

Arbuscular mycorrhizal fungal community characteristics and driving factors in different grassland types

CHEN Ke-Yu(), XING Sen, TANG Yu, SUN Jia-Hui, REN Shi-Jie, ZHANG Jing, JI Bao-Ming*()   

  1. School of Grassland Science, Beijing Forestry University, Beijing 100083, China
  • Received:2023-08-19 Accepted:2023-12-21 Online:2024-05-20 Published:2023-12-21
  • Contact: (baomingji@bjfu.edu.cn)
  • Supported by:
    Nei Mongol Autonomous Region Science and Technology Project(2023KJHZ0021);Second Tibetan Plateau Scientific Expedition and Research (STEP) Program(2019QZKK0304)

摘要:

丛枝菌根真菌(AMF)在草地生态系统中广泛分布, 对维持草地生态系统生产力和稳定性具有重要意义, 而中国天然草地生态系统AMF群落的分布特征及其驱动机制尚不明确。该研究以常见的18种草地类型为研究对象, 通过野外调查不同植物群落特征, 分析土壤理化性质和AMF群落特征, 探究中国草地生态系统不同草地类型土壤AMF群落特征及其驱动因素。结果表明, 近明球囊霉属(Claroideoglomus)、隔球囊霉属(Septoglomus)多孢囊霉属(Diversispora)、根孢囊霉属(Rhizophagus)、无梗囊霉属(Acaulospora)、球囊霉属(Glomus)和双型囊霉属(Ambispora)在不同草地类型AMF群落中占据优势地位(相对多度>15%)。不同草地类型AMF群落在物种组成和多样性上存在差异, 且紫花针茅(Stipa purpurea)草地AMF群落多样性和稀有可操作分类单元(OTU) (相对多度<0.1%的OTU)占比相对较高。结构方程模型表明, AMF群落多样性受植物群落多样性和土壤pH的显著影响, 而AMF群落组成受温度、土壤含水率和植物群落组成的显著影响。综上所述, 中国天然草地AMF资源丰富, 且不同草地类型AMF群落存在较大差异。草地生态系统植物群落特征对AMF群落特征具有强烈的驱动作用, 保护植物多样性对于维持土壤微生物群落稳定性具有重要意义。

关键词: 丛枝菌根真菌, 草地生态系统, 群落组成, 多样性, 驱动因素

Abstract:

Aims Arbuscular mycorrhizal fungi (AMF) are widely distributed in grassland ecosystems. They make great contribution to the productivity and stability of grassland ecosystems. Our purpose was to explore the AMF community distribution characteristics and driving mechanism in grassland ecosystems.

Methods This study was conducted in 18 different grassland types. We demonstrate the AMF community characteristics and driving factors by investigating plant community characteristics, analyzing soil physicochemical properties and AMF communities.

Important findings In different grassland types, the dominant genera of AMF community were Claroideoglomus, Septoglomus, Diversispora, Rhizophagus, Acaulospora, Glomus and Ambispora. In addition, there exist significant differences in speicies composition and diversity of AMF communities, and the AMF diversity and rare operational taxonomic unites (OTUs) in Stipa purpurea grassland was relatively higher than those of other grassland types. Results from the structural equation model showed that AMF community diversity was significantly influenced by plant community diversity and soil pH, and AMF community composition was significantly influenced by temperature, soil moisture content and plant community composition. To sum up, abundant AMF resources were contained within Chinese natural grassland, and the AMF community characteristics in different grassland types are significantly different. Meanwhile, plant communities have remarkable driving effect on AMF communities in grassland ecosystems. So protecting grassland plant diversity is of great importance for maintaining soil microbial community stability.

Key words: arbuscular mycorrhizal fungi, grassland ecosystem, community composition, diversity, driving factor