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Soil resource heterogeneity competitively favors an invasive clonal plant over a native one

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Abstract

Soil resource heterogeneity can affect plant growth and competitive ability. However, little is known about how soil resource heterogeneity affects competitive interactions between invasive and native plants. We conducted an experiment with an invasive clonal plant Alternanthera philoxeroides and a coexisting native one Alternanthera sessilis. The experiment was a randomized design with three factors, i.e. two species (A. philoxeroides and A. sessilis), two interspecific competition treatments (with and without) and five soil treatments (three homogeneous treatments and two small-scale heterogeneous treatments consisting of two patches of 10 cm × 15 cm and with different initial planting positions). Irrespective of competition, increasing soil resource availability increased the growth of A. philoxeroides. Increasing soil resource availability also increased the growth of A. sessilis without competition, but had no impact with competition. Irrespective of competition, soil resource heterogeneity increased biomass and ramet production of A. philoxeroides, and such effects were independent of initial planting position. For A. sessilis, however, soil resource heterogeneity only increased ramet production when the initial plant was grown in the low-resource patch without competition. Our results suggest that both high soil resource availability and small-scale soil resource heterogeneity can increase the relative competitive ability of the invasive plant A. philoxeroides when grown with its native congener A. sessilis. These findings may partly explain the invasion success of this clonal species in area with high soil resource availability and heterogeneity caused by e.g. nitrogen deposition, fertilization and disturbance.

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Acknowledgements

We thank Cheng-Fu Wei for assistance with the experiment, and the handling editor and two anonymous reviewers for their insightful comments on an earlier version of the manuscript. This research was supported by the National Key Research and Development Program of China (2017YFC0505903), NSFC (41871077, 31870610). Innovative Transdisciplinary Program "Ecological Restoration Engineering" of the Beijing Municipal Education Commission, and the Ten Thousand Talent Program of Zhejiang Province (2018R52016).

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JQG, FHY, WYY conceived and designed the experiments. WYY and XYZ performed the experiments. JFL, JQG, FHY analyzed the data. JFL, JQG, FHY wrote the manuscript; other authors provided editorial advice.

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Correspondence to Jun-Qin Gao or Fei-Hai Yu.

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The authors declare that they have no conflict of interest.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Communicated by Brian J. Wilsey.

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Liang, JF., Yuan, WY., Gao, JQ. et al. Soil resource heterogeneity competitively favors an invasive clonal plant over a native one. Oecologia 193, 155–165 (2020). https://doi.org/10.1007/s00442-020-04660-6

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  • DOI: https://doi.org/10.1007/s00442-020-04660-6

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