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A widespread nitrogen-fixing invader experiences negative soil feedbacks despite enhancing the abundance of beneficial soil microbes

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Abstract

Background and aims

Plant-soil feedbacks may determine the long-term success of introduced species. Here we examined plant-soil feedbacks of a globally invasive shrub, Cytisus scoparius (hereafter Cytisus), which associates with multiple guilds of microbial mutualists and dominates harvested Douglas-fir forests in the Pacific Northwest.

Methods

We studied Cytisus root nodulation, mycorrhizal colonization, and growth in two greenhouse experiments. First, we compared invaded to uninvaded field soils. Then we did a soil conditioning experiment with Cytisus (in both invaded and uninvaded field soil) compared to soil conditioned by Douglas-fir.

Results

Cytisus grown in invaded soils had 67% more root nodules and 72% more AMF colonization than uninvaded soil. Conditioning uninvaded soil with Cytisus increased root nodules by 14% and mycorrhizal colonization by 55%, compared to Douglas-fir conditioned soil. Despite the increased abundance of mutualists, Cytisus grown in Cytisus-conditioned soils were 41% smaller than in uninvaded soil.

Conclusions

Cytisus increased the abundance of its microbial mutualists in soils, but overall plant-soil feedback was still negative, likely driven by soilborne pathogens, nutrient depletion, and/ or reduced benefits of mutualists. Our results do not support the idea that the high densities reached by Cytisus in its invaded range are caused by positive plant-soil feedbacks.

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Acknowledgements

We would like to thank Michelle and Dick Grove, Kyle Gern, Gregory Gilbert, and the UCSC greenhouse staff for assistance, Erin Aiello for creating our experimental design schematic, and to Karen Tanner and Zack Shearin for comments on the manuscript. This work was supported by NSF grants DEB 1354985 to KAH, IMP, and SG and DEB 1655896 to IMP.

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Correspondence to Elizabeth J. Davis.

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Responsible Editor: François Teste.

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Davis, E.J., Grove, S., Haubensak, K.A. et al. A widespread nitrogen-fixing invader experiences negative soil feedbacks despite enhancing the abundance of beneficial soil microbes. Plant Soil 462, 257–271 (2021). https://doi.org/10.1007/s11104-020-04804-w

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  • DOI: https://doi.org/10.1007/s11104-020-04804-w

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