Abstract
Aims
Resident plants can exert allelopathic effects on introduced exotic plants, and resistance to exotic plant invasions usually increases with diversity and density of the resident plant communities. We hypothesize that allelopathic effects increase with increasing diversity and density of the community, and thereby contribute to the community’s resistance against invaders.
Methods
To test these hypotheses, we conducted two greenhouse experiments in which we grew five individuals of the exotic invasive plant Solidago canadensis in pots without residents and in artificially assembled resident plant communities either with two levels of diversity (4 or 8 resident plant species) or two levels of density (8 or 32 individuals, representing 8 species). We used activated carbon as the allelopathy-neutralizer treatment in both the diversity and the density experiment.
Results
In the absence of activated carbon, S. canadensis grew worse in the presence of residents, and when diversity or density of the residents increased. These negative effects, however, largely disappeared in the presence of activated carbon, and at the highest resident density S. canadensis even performed better with than without activated carbon.
Conclusions
Low invasibility of species-rich and dense plant communities is likely to be at least in part associated with increased allelopathy. Our study provides the first evidence that increasing allelopathy could be a mechanism underlying the diversity and density effects on community invasibility.
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Acknowledgements
The work was supported by the National Key Research and Development Program of China (2016YFC1201100) and NSFC (31570413).
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FHY and MvK conceived the ideas and designed methodology; LN collected the data; FHY and LN analysed the data; MOA and MT led the writing of the manuscript. All authors contributed critically to the drafts and gave final approval for publication.
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Adomako, M.O., Ning, L., Tang, M. et al. Diversity- and density-mediated allelopathic effects of resident plant communities on invasion by an exotic plant. Plant Soil 440, 581–592 (2019). https://doi.org/10.1007/s11104-019-04123-9
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DOI: https://doi.org/10.1007/s11104-019-04123-9