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Impact of a native invasive weed (Microstegium ciliatum) on regeneration of a tropical forest

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Abstract

Infestations of invasive plants can hinder forest regeneration in biodiversity hotspots in tropical Asia. Microstegium ciliatum is a native grass in parts of tropical and subtropical Asia. To assess impacts of Microstegium on secondary forest succession in its native range, a field experiment was undertaken in abandoned agricultural settlements in Cuc Phuong National Park, Vietnam from 2016 to 2018. Plots were established across 6 sites under low, medium and high tree canopy levels. In manipulated plots, M. ciliatum was killed with a grass-specific herbicide and invading vines were cut in a subset of plots; control plots were untreated. The results show that in its native range Microstegium can be invasive with impacts on forest restoration. Application of herbicide reduced the cover of M. ciliatum from 85 to 3% and increased the diversity and number of tree seedlings within the 2 years of the experiment. There was no difference in tree seedling abundance between the herbicide and herbicide + vine cutting treatments, but the number of tree seedling species was significantly higher in the latter in the 2nd year after treatments were applied under the medium canopy. The overstory influenced forest regeneration in the manipulated plots as there was a greater number of tree seedlings and species in plots under medium and high-density canopies. The results suggest that management of the native invasive grass under tree canopies will facilitate forest restoration after disturbance from agriculture and lead to the early recruitment of mid and late successional forest species.

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Acknowledgements

The study was conducted with the financial support of an Australian Awards Scholarship and Small Grant for Early Career Researchers funded by School of Veterinary and Life Sciences, Murdoch University. We thank Cuc Phuong National Park staff for their support whilst undertaking fieldwork.

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Correspondence to T. T. A. Truong.

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Appendix

Appendix

Summary of ANOVA test

See Tables 2, 3, 4 and 5.

Table 2 ANOVA test of linear mixed effect models for the effects of canopy, treatment and their interaction on the cover of M. ciliatum. Bold values denote statistical significance at the p < 0.05 level
Table 3 ANOVA test of linear mixed effect models for the effects of canopy, treatment and their interaction on number of tree seedlings and number of species. Bold values denote statistical significance at the p < 0.05 level
Table 4 Importance value index (IVI) of tree species in study sites in Cuc Phuong National Park
Table 5 Number of tree seedling species in experiment plots over three years and their descriptions

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Truong, T.T.A., Andrew, M.E., Hardy, G.E.S.J. et al. Impact of a native invasive weed (Microstegium ciliatum) on regeneration of a tropical forest. Plant Ecol 222, 173–191 (2021). https://doi.org/10.1007/s11258-020-01097-y

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