Influence de la liane envahissante Sericostachys scandens Gilg & Lopr. (Amaranthaceae) sur la diversité des espèces végétales ligneuses du Parc National de la Kibira au Burundi | Influence of the invasive liana Sericostachys scandens Gilg & Lopr. (Amaranthaceae) on the floristic diversity of the woody community in the Kibira National Park in Burundi
2020
Habonayo, Richard | Azihou, Akomian Fortuné | Dassou, Gbèwonmèdéa Hospice | Havyarimana, François | Adomou, Aristide Cossi | Habonimana, Bernadette
This study aims to (1) estimate the effect of Sericostachys scandens density on the species richness of woody species development stages, and (2) evaluate the variation in floristic composition of woody species development stages according to S. scandens density within the Kibira National Park (KNP) in Burundi. The abundance of this liana and other woody species (regeneration, juvenile and adult trees) was measured in 100 plots of 50 m × 50 m each, evenly distributed in invaded and non-invaded areas. A negative binomial regression was performed to test the effect of liana density on the species richness of each development stage of woody plant species. A multivariate analysis of the variance on dissimilarity matrix (ADONIS) was performed to test the variation of the floristic composition of woody communities according to the density of the invading liana. Liana density negatively affects regeneration (t = −10.170; p < 0.0001), juvenile (t = −4.346; p < 0.0001) and adult trees (t = −7.740; p < 0.0001). The invasion by S. scandens causes variation in the floristic composition of juvenile (p = 0.02) and adult trees (p = 0.01). Future studies should identify the woody species having the highest local extirpation probability owing to the expansion of S. scandens.
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