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Plant–Soil Feedbacks Contribute to the Persistence of Bromus inermis in Tallgrass Prairie

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Abstract

As invasive plants become a greater threat to native ecosystems, we need to improve our understanding of the factors underlying their success and persistence. Over the past 30 years, the C3 nonnative plant Bromus inermis (smooth brome) has been spreading throughout the central grasslands in North America. Invasion by this grass has resulted in the local displacement of natives, including the tallgrass species Panicum virgatum (switchgrass). To determine if factors related to resource availability and plant–soil interactions were conferring a competitive advantage on smooth brome, field plots were set up under varying nitrogen (N) levels. Plots composed of a 1:1 ratio of smooth brome and switchgrass were located in a restored tallgrass prairie and were randomly assigned one of the following three N levels: (a) NH4NO3 added to increase available N, (b) sucrose added to reduce available N, and (c) no additions to serve as control. In addition, soil N status, soil respiration rates, plant growth, and litter decomposition rates were monitored. Results indicate that by the 2nd year, the addition of sucrose significantly reduced available soil N and additions of NH4NO3 increased it. Further, smooth brome had greater tiller density, mass, and canopy interception of light on N-enriched soils, whereas none of these characteristics were stimulated by added N in the case of switchgrass. This suggests that smooth brome may have a competitive advantage on higher-N soils. Smooth-brome plant tissue also had a lower carbon–nitrogen (C:N) ratio and a higher decomposition rate than switchgrass and thus may cycle N more rapidly in the plant–soil system. These differences suggest a possible mechanism for the persistence of smooth brome in the tallgrass prairie: Efficient recycling of nutrient-rich litter under patches of smooth brome may confer a competitive advantage that enables it to persist in remnant or restored prairies. Increased N deposition associated with human activity and changing land use may play a critical role in the persistence of smooth brome and other N-philic exotic species.

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Acknowledgements

Financial support came from the Clare Boothe Luce Endowment at Creighton University and the National Science Foundation’s Long Term Ecological Research Program (DEB 96328510) at Konza Prairie Research Natural Area. We thank Mary Heffron, Corey Rife, Dan Deatsch, Emily Kathol, and Leanne Vigue Miranda for field and laboratory assistance.

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  1. Erin M. Goergen

    Present address: Ecology, Evolution, and Conservation Biology Graduate Group, Natural Resources and Environmental Science, University of Nevada-Reno, 1000 Valley Road, Reno, Nevada, 89512, USA

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  1. Department of Biology, Creighton University, Omaha, Nebraska, 68178, USA

    Mary Ann Vinton & Erin M. Goergen

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Correspondence to Mary Ann Vinton.

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Vinton, M.A., Goergen, E.M. Plant–Soil Feedbacks Contribute to the Persistence of Bromus inermis in Tallgrass Prairie. Ecosystems 9, 967–976 (2006). https://doi.org/10.1007/s10021-005-0107-5

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