植物生态学报 ›› 2018, Vol. 42 ›› Issue (1): 126-132.DOI: 10.17521/cjpe.2017.0111

• 研究论文 • 上一篇    下一篇

黄帚橐吾种群扩张对土壤理化特性与微生物功能多样性的影响

石国玺1,2,王文颖1,蒋胜竞3,成岗3,姚步青2,冯虎元3,*(),周华坤2,*()   

  1. 1 青海师范大学生命与地理科学学院, 西宁 810008
    2 中国科学院西北高原生物研究所, 青海省寒区恢复生态学重点实验室, 西宁 810008
    3 兰州大学生命科学学院, 细胞活动与逆境适应教育部重点实验室, 兰州 730000
  • 出版日期:2018-01-20 发布日期:2018-01-18
  • 通讯作者: 冯虎元,周华坤
  • 基金资助:
    国家自然科学基金(31500427);国家自然科学基金(31572354);国家自然科学基金(31472135);青海省自然科学基金(2016-ZJ-957Q);青海省自然科学基金(2016-ZJ-910);青海省创新平台建设专项(2017-ZJ-Y20);国家重点研发计划(2016YFC0501901)

Effects of the spreading of Ligularia virgaurea on soil physicochemical property and microbial functional diversity

SHI Guo-Xi1,2,WANG Wen-Ying1,JIANG Sheng-Jing3,CHENG Gang3,YAO Bu-Qing2,FENG Hu-Yuan3,*(),ZHOU Hua-Kun2,*()   

  1. 1 College of Life Science and Geography, Qinghai Normal University, Xining 810008, China

    2 Key Laboratory of Restoration Ecology of Cold Area in Qinghai Province, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008

    3 Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou 730000, China
  • Online:2018-01-20 Published:2018-01-18
  • Contact: Hu-Yuan FENG,Hua-Kun ZHOU
  • Supported by:
    Supported by the National Natural Foundation of China(31500427);Supported by the National Natural Foundation of China(31572354);Supported by the National Natural Foundation of China(31472135);the Province Natural Foundation of Qinghai(2016-ZJ-957Q);the Province Natural Foundation of Qinghai(2016-ZJ-910);the Qinghai Innovation Platform Construction Project(2017-ZJ-Y20);the National Key Research and Development Project of China(2016YFC0501901)

摘要:

黄帚橐吾(Ligularia virgaurea)是高寒草甸退化的指示物种, 其种群扩张已严重影响了草地生态系统的经济服务功能, 但目前仍不明确土壤微生物是否参与了黄帚橐吾的种群扩张。该研究依托兰州大学高寒草甸试验站, 选择了4个不同密度的黄帚橐吾斑块, 分析了黄帚橐吾种群扩张对该草甸土壤微生物功能多样性的影响。结果显示: 黄帚橐吾种群扩张虽然提高了土壤微生物活性, 但降低了土壤速效氮浓度。各斑块间土壤微生物Shannon指数、碳源利用种类、均一度指数均无显著差异, 但高密度斑块的土壤微生物碳源利用结构与对照斑块有显著差异。表明黄帚橐吾分布地土壤微生物功能多样性的改变所引起的土壤氮素限制是黄帚橐吾种群数量急剧增加的机制之一。

关键词: 青藏高原, 黄帚橐吾, 种群扩张, 土壤微生物群落, 功能多样性

Abstract:

Aims Ligularia virgaurea is an indicator species of alpine meadow degradation. Recently, the vast spreading of L. virgaurea has brought the serious economic loss of grassland ecosystem, but it remains unclear whether soil microbes involve in the spreading of L. virgaurea.

Methods We chose four patches with different density of L. virgaurea to measure the influence of spreading of L. virgaurea on the functional diversity of soil microbial community in the Qinghai-Xizang Plateau.

Important findings The spreading of L. virgaurea increased soil microbial activity, but reduced soil available nitrogen concentration. The Shannon index, utilization number of carbon resource and evenness index of soil microbial community displayed no significant differences among patches, but the utilization structure of carbon resource in high density patch was significantly different from control patch. Our findings indicate that the limitation of soil nitrogen caused by the changing functional diversity of soil microbial community in the distributed sites is one of the mechanisms for the vast spreading of L. virgaurea in alpine meadow ecosystem.

Key words: Qinghai-Xizang Plateau, Ligularia virgaurea, population spreading, soil microbial community, functional diversity