Structural attributes of lantana-invaded forest plots in Achanakmar-Amarkantak Biosphere Reserve, Central India

Abstract

Vegetation of lantana-invaded forest plots in the Achanakmar-Amarkantak Biosphere Reserve has been analysed. Only 20 out of the 126 plots examined were found infested with lantana (Lantana camara L.). These plots were divided into low lantana density and high lantana density groups. Ordination using Principal Component Analysis on the structural attributes of the vegetation separated the plots into low altitude and high altitude groups, but did not separate lower lantana density plots from higher lantana density plots. ANOVA also indicated no significant differences in the community-level structural attributes between lower and higher lantana density plots. Nevertheless, species-level differences were evident. Some species were more abundant and showed better regeneration potential in lower lantana density plots, while others did so in higher lantana density plots. However, time-series observations on permanent plots and experimental studies on competitive and allelopathic interactions in natural field plots are warranted for ascertaining the impact of lantana invasion and for ascribing the cause and effect relationships which, at present, remain speculative. Such studies will help identify and maintain ecological barriers to lantana invasion in order to promote conservation and biodiversity in the reserves.