Vegetation structure and species diversity in community managed Sal (Shorea robusta) forest of Tanahun district, Nepal

Abstract

Vegetation structure and species diversity were studied in four community managed Shorea robusta forests in midhill of Tanahun district, Nepal. These forests have been managed for 6 to 21 years by communities. A stratified random sampling method, using square quadrats was used for vegetation and soil sampling. Altogether 100 quadrats were sampled to determine the Importance Value Index (IVI) of tree species, species diversity and soil attributes. Soil was collected from each quadrat and their physiochemical characteristics (Soil pH, organic carbon, total nitrogen, available phosphorus and potassium) were analyzed. Altogether 36 and 35 tree species were recorded in MCF and LCF forest respectively. Tree density was higher in MCF forest and shrub density was higher in LCF forest.. Regeneration was assessed by density-diameter curve. The density diameter curve of the tree population of sal on MCF and LCF forests indicates reversed J-shaped structure and show sustainable regeneration. High priority had been given for the conservation of sal in both forests. Regeneration of codominant species Schima wallichi was sustainable in both forests. The study found that these community forests are moving toward promoting limited timber yielding species that have high economic value.. The species diversity index of species was higher in MCF forest than in LCF forest. This study helps in the formation of effectual forest management and conservation strategies.