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Contribution of root traits to variations in soil microbial biomass and community composition

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Abstract

Aims

It is well known that plant root-microbe interactions are critical drivers of ecosystem processes such as soil carbon and nutrient cycling; however, considerable uncertainties exist about how root chemical and morphological traits influence soil microbial community composition.

Methods

We used 13 tree species grown in field monocultures in subtropical China to explore the ecological linkages between leaves, leaf litter, and root chemical and morphological traits associated with plant growth and nutrient-acquisition strategies, as well as soil microbial biomass, the fungi to bacteria (F/B) ratio, and Gram-positive to Gram-negative bacteria (GP/GN) ratio.

Results

The combination of above- and belowground traits captured a greater proportion of variations in soil microbial biomass and community composition than did aboveground traits alone. Individually, root traits explained more variations of the F/B and GP/GN ratios than did the individual effects of aboveground leaf or leaf litter traits. All distinct microbial biomass groups and F/B ratios decreased with the specific root length, whereas the F/B ratio increased, and the GP/GN ratio decreased with root tissue density.

Conclusions

Our study highlighted the importance of the functional traits of plant roots in determining the microbial biomass and community composition in forest ecosystems. The combination of leaf and root traits may improve our understanding of the mechanisms that underly plant-microbe interactions toward the sustainable management of forest ecosystems.

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Acknowledgements

We gratefully acknowledge Bingbing Zhang, Tao Wang, Junqian Yang, Yifan Liang, and Lei Wang for their assistance with field sampling. This research was supported by the National Science Fund for Distinguished Young Scholars (31625007), the National Natural Science Foundation of China (31570604 and 31600495), and Natural Science Foundation of Fujian Province (2018J01714).

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Authors and Affiliations

  1. State Key Laboratory of Subtropical Mountain Ecology (Funded by Ministry of Science and Technology and Fujian Province), Fujian Normal University, Fuzhou, 350007, China

    Xiaohua Wan, Zhiqun Huang & Han Y. H. Chen

  2. School of Geographical Science, Fujian Normal University, 350007, Fuzhou, China

    Xiaohua Wan, Zhiqun Huang & Han Y. H. Chen

  3. Faculty of Natural Resources Management, Lakehead University, 955 Oliver Road, Thunder Bay, ON, Canada

    Xinli Chen & Han Y. H. Chen

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  1. Xiaohua Wan
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Correspondence to Zhiqun Huang.

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Wan, X., Chen, X., Huang, Z. et al. Contribution of root traits to variations in soil microbial biomass and community composition. Plant Soil 460, 483–495 (2021). https://doi.org/10.1007/s11104-020-04788-7

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