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Effects of soil nitrogen availability on rhizodeposition in plants: a review

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Abstract

Background

Soil contains the majority of terrestrial carbon (C), forming the foundation for soil fertility and nutrient cycling. One key source of soil C is root-derived C, or rhizodeposits, which signal and sustain microbes that cycle nutrients such as nitrogen (N). Although N availability can affect rhizodeposition both quantitatively and qualitatively, these effects remain poorly understood due to conflicting results among studies.

Scope

Here, we review studies examining the influence of soil N availability on rhizodeposition. We conduct a quantitative analysis of the response of various rhizodeposition C pools to N availability, and assess methodological aspects potentially underlying the highly variable results among studies. We also review impacts of N availability on the composition and quality of rhizodeposits.

Conclusions

Effects of N on rhizodeposition were strongly dependent upon the specific C pools considered and the units for reporting those pools. N additions increased nearly all rhizodeposit C pools when expressed on a per plant basis, and decreased rhizodeposition per unit fixed C for several C pools, while no rhizodeposition C pools were significantly altered when expressed per unit root mass. Nevertheless, N effects were generally mixed due to a combination of variation in experimental methods and species-specific responses. Overall, our review indicates several key challenges for better understanding the mechanistic links between N availability, plant physiology, and microbial function. Identifying such links would substantially improve our ability to predict C- and N-dynamics in changing ecosystems.

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Acknowledgements

This research was supported by the Office of Science (BER), U.S. Department of Energy, grant no. DE-SC0014108. We would also like to acknowledge three anonymous reviewers for their constructive feedback which greatly improved the quality of this manuscript.

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Correspondence to Alan W. Bowsher.

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The authors declare that they have no conflict of interest.

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Responsible Editor: Eric Paterson

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Bowsher, A.W., Evans, S., Tiemann, L.K. et al. Effects of soil nitrogen availability on rhizodeposition in plants: a review. Plant Soil 423, 59–85 (2018). https://doi.org/10.1007/s11104-017-3497-1

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  • DOI: https://doi.org/10.1007/s11104-017-3497-1

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