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Root traits and soil micro-organisms as drivers of plant–soil feedbacks within the sub-arctic tundra meadow
Journal of Ecology ( IF 5.5 ) Pub Date : 2021-11-17 , DOI: 10.1111/1365-2745.13814
Clydecia M. Spitzer 1 , David A. Wardle 2 , Björn D. Lindahl 3 , Maja K. Sundqvist 1 , Michael J. Gundale 1 , Nicolas Fanin 4 , Paul Kardol 1
Affiliation  

  1. Plant–soil feedback (PSF) results from the influence of plants on the composition and abundance of various taxa and functional groups of soil micro-organisms, and their reciprocal effects on the plants. However, little is understood about the importance of fine root traits and root economic strategies in moderating microbial-driven PSF.
  2. We examined the relationships between PSF and 11 chemical and morphological root traits from 18 sub-arctic meadow plant species, as well as the soil microbial community composition which we characterized using phospholipid fatty acids (PLFAs) and high-throughput sequencing. We also investigated the importance of the root economics spectrum in influencing PSF, because it indicates plant below-ground economic strategies via trade-offs between resource acquisition and conservation.
  3. When we considered the entire root economics spectrum, we found that PSFs were more negative when root trait values were more acquisitive across the 18 species. In addition, PSF was more negative when values of root nitrogen content and root forks per root length were higher, and more positive when root dry matter content was higher. We additionally identified two fungal orders that were negatively related to PSF. However, we found no evidence that root traits influenced PSF through its relationship with these fungal orders.
  4. Synthesis. Our results provide evidence that for some fine root traits, the root economics spectrum and some fungal orders have an important role in influencing PSF. By investigating the roles of soil micro-organisms and fine root traits in driving PSF, this study enables us to better understand root trait–microbial linkages across species and therefore offers new insights about the mechanisms that underpin PSFs and ultimately plant community assembly.


中文翻译:

根性状和土壤微生物作为亚北极苔原草甸植物-土壤反馈的驱动因素

  1. 植物-土壤反馈(PSF)是植物对土壤微生物的各种分类群和功能群的组成和丰度的影响,以及它们对植物的相互影响的结果。然而,对于细根性状和根经济策略在调节微生物驱动的 PSF 中的重要性知之甚少。
  2. 我们检查了 PSF 与 18 种亚北极草甸植物物种的 11 种化学和形态根性状之间的关系,以及我们使用磷脂脂肪酸 (PLFA) 和高通量测序表征的土壤微生物群落组成。我们还调查了根经济谱在影响 PSF 中的重要性,因为它通过资源获取和保护之间的权衡表明植物地下经济战略。
  3. 当我们考虑整个根经济学谱时,我们发现当根性状值在 18 个物种中更具获取性时,PSF 更负。此外,根氮含量和每根长根叉的值越高,PSF越负,而根干物质含量越高,PSF越正。我们还发现了两种与 PSF 负相关的真菌目。然而,我们没有发现根系特征通过与这些真菌目的关系影响 PSF 的证据。
  4. 合成。我们的研究结果证明,对于一些优良的根性状,根经济谱和一些真菌目在影响 PSF 方面具有重要作用。通过调查土壤微生物和细根性状在驱动 PSF 中的作用,本研究使我们能够更好地了解不同物种的根性状 - 微生物联系,从而为支持 PSF 和最终植物群落组装的机制提供新的见解。
更新日期:2021-11-17
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