Abstract
Ecological status of flora in Great Himalayan National Park (Wildlife Sanctuary-Sainj) was undertaken to evaluate the plant biodiversity of Great Himalayan National Park Conservation Area (GHNP-CA) in Kullu district representing the biogeography zone-24 in North West Himalaya. A total of 832 plant species belonging to 427 genera and 128 families of higher plants were recorded within GHNP. During the vegetation survey of Wildlife Sanctuary, Sainj in different altitudinal zones, 28 species of trees were recorded. Some species of trees viz. Picea smithiana, Pinus wallichiana and Abies pindrow, are dominant species between the altitudes from 1500 to 3500 m. whereas, the species, Prunus cerasoides, Morus alba, Hippophae salicifolia and Prunus species are sparsely present in this area. The altitude from 3000-3500m, showed the highest concentration of dominance and species diversity. The altitude from 1500-2000m showed the highest richness and the highest evenness between altitude 2500-3000 m. It is also concluded that total number of species decreased with increase in elevation and diversity index value was high in lower elevation in comparison to higher elevation.
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