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首页> 外文期刊>Journal of soils & sediments >Response of rhizosphere microbial communities to plant succession along a grassland chronosequence in a semiarid area
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Response of rhizosphere microbial communities to plant succession along a grassland chronosequence in a semiarid area

机译：半干旱地区沿草原慢素植物流域植物连续的反应

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摘要

Purpose: Changes in microbial communities during natural succession in semiarid areas have been widely studied but their association with plant and soil properties remains elusive. In the present study, we investigated plant characteristics, rhizosphere soil variables, and microbial communities along a chronosequence of grasslands forming on abandoned farmland on the Chinese Loess Plateau.Materials and methods: Rhizosphere samples were collected from the early-stage dominant plant Artemisia capillaris from farmland abandoned for 5, 10, and 15 years and from the late-stage dominant plant Artemisia sacrorum from farmland abandoned for 10, 15, 20, and 30 years. Microbial community composition, including bacteria and fungi, was determined by high-throughput sequencing. Microbial succession rates represented by temporary turnover were assessed using the slope (w value) of linear regressions, based on log-transformed microbial community similarity over time.Results and discussion: Cover and aboveground biomass of A. capillaris tended to decrease, whereas those of A. sacrorum increased during the succession. Although the rhizosphere bacteria of A. capillaris transitioned from Proteobacteria-dominant to Actinobacteria-dominant, the bacteria of A. sacrorum exhibited the opposite trend. Bacterial and fungal community diversity tended to increase logarithmically with increasing plant aboveground biomass, indicating that an increase in plant biomass could lead to enhanced rhizosphere microbial diversity, but the rate of enhancement decreased gradually. A lower temporary turnover rate of bacterial and fungal communities in the rhizosphere than that in the bulk soil indicated a higher successional rate of the rhizosphere microbial community. Levels of soil nutrients, such as organic carbon, nitrate nitrogen, and ammonium nitrogen, were closely associated with the abundance and diversity of bacterial and fungal communities, indicating their critical role in shaping the rhizosphere microbial community.Conclusions: Our results indicate a close association between plant succession and rhizosphere microbial succession in a semiarid area. Plants affect the microbial communities possibly by changing the nutrient input into the rhizosphere.
机译：目的：在半干旱地区自然继承过程中的微生物群落的变化已被广泛研究，但它们与植物和土壤性质的关联仍然难以捉摸。在本研究中，我们沿着中国黄土高原遗弃农田的格兰兰成长的植物特征，根际土壤变量和微生物社区。材料和方法，从早期的占优势植物Artemisia Capillaris收集根际样品农田被遗弃5,10和15年，并从阶下的占优势植物从农田遗弃10,15,20和30年的aremisia sacrorum。通过高通量测序测定微生物群落组合物，包括细菌和真菌。使用线性回归的斜率（W值）评估由线性回归的斜率（W值）表示的微生物连续率，基于随时间的对数转换的微生物群落相似性。结果和讨论：封面和地上的A. Capillaris倾向于减少，而那些A.在继任期间，饱满的匆匆增加。虽然A.辣椒的根际细菌从Proteobacteria占优势的植物显性，但A. Sacrorum的细菌表现出相反的趋势。细菌和真菌群落多样性倾向于随着植物上面的地上生物量增加，表明植物生物质的增加可能导致无根际微生物多样性增强，但增强速度逐渐减少。根际细菌和真菌社区的临时周转率低于散装土壤的细菌和真菌社区表明了根际微生物群落的继承率较高。土壤营养素等水平与细菌和真菌社区的丰富和多样性密切相关，表明它们在塑造根际微生物群落中的关键作用。结论：我们的结果表明了一个密切的关联半干旱地区植物连续和根际微生物连续。植物可能通过将营养输入改变为根际的营养素来影响微生物群落。

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  • 来源
    《Journal of soils & sediments》 |2019年第5期|2496-2508|共13页
  • 作者

    Song Zilin; Liu Guobin; Zhang Chao;

  • 作者单位

    Northwest A&F Univ State Key Lab Soil Eros & Dryland Farming Loess P Yangling 712100 Shaanxi Peoples R China|Northwest A&F Univ Coll Nat Resources & Environm Yangling 712100 Shaanxi Peoples R China;

    Northwest A&F Univ State Key Lab Soil Eros & Dryland Farming Loess P Yangling 712100 Shaanxi Peoples R China|Chinese Acad Sci & Minist Water Resources Inst Soil & Water Conservat Yangling 712100 Shaanxi Peoples R China;

    Northwest A&F Univ State Key Lab Soil Eros & Dryland Farming Loess P Yangling 712100 Shaanxi Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Grassland; Microbial community; Rhizosphere; Succession;

    机译：草原;微生物群落;根际;继承;

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