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Edge effects on plant diversity in tropical forest ecosystems at Periyar Wildlife sanctuary in the Western Ghats of India

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Abstract

Forest resource conservation has been widely accepted as a key to sustain the local and regional economic development. The forest edges are affected by anthropogenic activities including deforestation, forest fragmentation, selective logging, extraction of non-timber forest products, collection of medicinal plants, recreations, hydroelectric projects and its associated developmental activities, which alter the biodiversity. The present study intends to evaluate the edge effect on vegetation structure and species compositions in the tropical forest ecosystems at Periyar Wildlife Sanctuary in the Western Ghats. High species richness (number of species) and Shannon’s diversity indices were observed in the site III (completely undisturbed forest) compared to site I (adjacent to the village/ edge of the forest, which is next to the teak plantation, severely disturbed forest) and site II (in between the undisturbed forest and moderately disturbed forest) while density of tree species showed greater value in site II. Single species such as Tectona grandis (IVI of 80) and Terminalia paniculata (IVI of 112) were the dominant tree species in site I and site II, respectively, whereas, in site III Terminalia bellirica, Bishofia javanica and Syzgium gardneri shared the dominance. Perturbation leads to alien plant invasion particularly Lantana camara, Eupatorium odoratum and Ageratum conizoides. Site II is at forest transition level because the site is dominated by both natural species as well as plantation species such as Tectona grandis. This site seems to be a buffer zone on natural forest and plantations. Further studies are required to analyse the real patterns of regeneration and dynamic change due to human impact by long term monitoring with the establishment of permanent plots.

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  1. Department of Ecology and Environmental Sciences, School of Life Sciences, Pondicherry University, Puducherry, India

    Somaiah Sundarapandian & Pascal J. Karoor

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Sundarapandian, S., Karoor, P.J. Edge effects on plant diversity in tropical forest ecosystems at Periyar Wildlife sanctuary in the Western Ghats of India. Journal of Forestry Research 24, 403–418 (2013). https://doi.org/10.1007/s11676-013-0373-6

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