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Influence of two co-occurring invasive plant species on resident woody species and surface soil properties in Chipinge Safari Area, Zimbabwe

  • Norman Mahla
  • Donald MlamboEmail author
Research Article
  • 1 Downloads

Abstract

Savanna ecosystems contain multiple invasive woody plant species yet most ecological studies focus largely on single invader species. This study investigated the combined and single impacts of Lantana camara L. (sensu lato) and Dichrostachys cinerea (L.) Wight & Arn. on soil nutrient concentrations and resident woody species structure and diversity in Chipinge Safari Area, Zimbabwe. We laid 60 sample plots of 30 × 20 m in patches invaded by L. camara (L-invaded), D. cinerea (D-invaded), L. camara and D. cinerea (mixed) and in patches lacking both species (control). Soil C and N in mixed plots were twice greater than in L- or D-invaded (monoculture) plots and three times greater than in control plots. Soil P, K and pH did not differ between mixed and monoculture plots but were significantly higher compared to control plots. Soil moisture decreased on average by 64% in mixed and monoculture plots compared to control plots. Woody plant height, diameter, basal area as well as density of trees, shrubs and seedlings showed no significant difference between mixed and monoculture plots. The distributions of resident woody plant diameter and height conformed to the reverse “J” structure in control plots and bell-shaped structure in mixed and monoculture plots. The results suggest that co-invasion effects of L. camara and D. cinerea on resident woody vegetation and ecosystem functions can be greater or neutral than impacts of either invader species in isolation. We suggest that co-invaded sites should be prioritized for invasive plant management over single species invaded sites.

Keywords

African savanna Invasive plants Riverine vegetation Soil nutrients Species diversity Species richness 

Notes

Acknowledgements

The authors would like to thank the Zimbabwe Parks and Wildlife Management Authority for allowing them to carry out the study at CSA.

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Copyright information

© International Society for Tropical Ecology 2019

Authors and Affiliations

  1. 1.Department Forest Resources & Wildlife Management, Faculty of Applied ScienceNational University of Science &TechnologyBulawayoZimbabwe

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