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Mixed evidence for plant–soil feedbacks in forest invasions

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Abstract

Plant–soil feedbacks (PSFs) are plant-mediated changes to soil properties that ultimately influence plant performance, and can, thus, determine plant diversity, succession, and invasion. We hypothesized that PSFs influence invasion processes and that PSF mechanisms are largely driven by changes in soil properties produced by specific plant species. To test these hypotheses, we studied the effects of different soils collected from under common plant species on the growth of the invasive plant Phytolacca americana. We found that PSFs may interfere with invasion resistance because P. americana seedlings showed reduced growth (lower biomass) in soils collected from underneath some native species compared with soils collected from underneath P. americana and two non-native plants. We then selected eight co-occurring native and non-native plant species, and examined PSF dynamics and mechanisms in a pairwise conditioned soil greenhouse experiment. Plant species-specific conditioning effects regarding soil nutrients and enzyme activities were observed. Phytolacca americana had a high ability to use soil N, which may be related to its high invasion ability. Soil P was significantly lower in Quercus acutissima-conditioned soil, indicating that low P availability in Q. acutissima forests may enhance resistance to plant invasion. However, surprisingly, some native plants did not produce PSF effects that decreased the relative performance of invasive plants, nor did the invasive plants produce PSF effects that increased their own performance. We speculate that these PSF findings from greenhouse experiments cannot be extrapolated to field conditions because the litter and allelochemicals of some plants may be important for invasion resistance.

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Acknowledgements

We thank XY Xian, CX Zheng, and J Zhang for the laboratory support. We sincerely appreciate the suggestions from the two anonymous reviewers and Dr. Sarah Emery. This study was supported by the National Natural Science Foundation of China (31770581; 31300465), the Shandong Province Higher Educational Science and Technology Program (J17KA128), the Taishan Scholars Youth Expert Program (tsqn201812097), and the Shandong Provincial Agricultural Elite Varieties Project (2016LZGC038).

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YPH and QQH conceived and designed the study. WW and PZ performed the experiments and collected the data. WW, PZ, and YPH wrote the manuscript. WW, PDC, YPH, and XFB designed and performed the data analyses. QQH and GYN reviewed and improved the manuscript. All authors participated in the data interpretation and revised the manuscript.

Corresponding author

Correspondence to Yuping Hou.

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The authors declare that they have no conflict of interest.

Additional information

Communicated by Katherine Gross.

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Supplementary material 1 (DOC 37 kb)

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Wei, W., Zhu, P., Chen, P. et al. Mixed evidence for plant–soil feedbacks in forest invasions. Oecologia 193, 665–676 (2020). https://doi.org/10.1007/s00442-020-04703-y

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  • DOI: https://doi.org/10.1007/s00442-020-04703-y

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