Gaps created due to harvesting is expected to support the regeneration of native plant species. But it is widely criticized that regeneration felling under the shelterwood system promotes the monoculture of Shorea robusta, as its dominancy is very high in the regeneration layer. In this context, this study measured the plots with regeneration felling (managed plots) and nearby unmanaged plots to assess the differences in plant species richness and density in regeneration layers, and analysed with the canopy of managed plots before the harvesting. The results suggest that shelterwood system increases plant species richness and regeneration density, but lowers Shannon Diversity Index due to the dominance of S. robusta individuals. It also confirms that canopy opening enables regeneration to establish as sapling promoting both species richness and density at sapling layers. It informs that recent canopy openings promote the regeneration of light demander species and their colonization. When individuals gain certain heights, it influences the penetration of light in the forests floor and promote the regeneration of shade tolerant and moderately shade tolerant species. Hence, species richness increases with the age of gaps as it creates multiple layers.
목차
Abstract Introduction Materials and Methods Study area Data collection Data analysis Results and Discussion Conclusions Acknowledgements References