Abstract
Background
Rhizodeposition is the release of organic compounds from plant roots into soil. Positive relationships between rhizodeposition and soil microbial biomass are commonly observed. Rhizodeposition may be disrupted by increasing drought however the effects of water stress on this process are not sufficiently understood.
Scope
We aimed to provide a synthesis of the current knowledge of drought impacts on rhizodeposition. The current scarcity of well-defined studies hinders a quantitative meta-analysis, but we are able to identify the main effects of water stress on this process and how changes in the severity of drought may produce different responses. We then give an overview of the links between rhizodeposition and microbial communities, and describe how drought may disrupt these interactions.
Conclusions
Overall, moderate drought appears to increase rhizodeposition per gram of plant, but under extreme drought rhizodeposition is more variable. Concurrent decreases in plant biomass may lessen the total amount of rhizodeposits entering the soil. Effects on rhizodeposition may be strongly species-dependant therefore impacts on soil communities may also vary, either driving subsequent changes or conferring resilience in the plant community. Advances in the study of rhizodeposition are needed to allow a deeper understanding of this plant-soil interaction and how it will respond to drought.
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Acknowledgments
This research was supported by the European FP7 S-Clima project PIEF-GA-2013-626234, the European Research Council Synergy grant ERC-2013-726 SyG-610028 IMBALANCE-P, the Spanish Government project CGL2013-48074-P and the Catalan Government project SGR 2014- 274.
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Preece, C., Peñuelas, J. Rhizodeposition under drought and consequences for soil communities and ecosystem resilience. Plant Soil 409, 1–17 (2016). https://doi.org/10.1007/s11104-016-3090-z
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DOI: https://doi.org/10.1007/s11104-016-3090-z