Vegetation ecology of the Similipal biosphere reserve, Orissa, India

Abstract

Vegetation analysis of the forest ecosystem of Similipal Biosphere Reserve (SBR) was carried out at 10 sites to study changes in structure and composition in plant community distributed in the core (undisturbed) and buffer (disturbed) areas of the reserve. The study reveals a higher number of herbs and shrubs and a lower number of trees in the buffer area indicating greater anthropogenic disturbance. Total tree basal area varied from 48.7 to 78.61 m2 ha-1 in the buffer area and 81.4 to 104.9 m2ha -1 in the core area. The density of saplings and seedlings was nearly equal both at the disturbed and undisturbed sites. However, the rate of conversion of saplings to trees was greater at undisturbed sites. The lower rate of conversion at disturbed sites is due to the removal of seedlings of most of the tree species. The high herb diversity (2.14 - 3.50) and low tree diversity (2.14 - 2.98) in buffer area is a result of Environmental openings providing greater opportunity for the recruitment of herbs and shrubs. The presence of only a few individuals of major tree species in larger diameter classes and more in young diameter classes in buffer areas indicate that the plant community was subjected to disturbance and are in the regenerating stage. Greater fluctuation in the species / genus ratio in the herbaceous species at sites of the buffer area in comparison to core area has led to variation in developmental status of plant communities among the core and buffer areas of the reserve. However, the presence of the seedlings of dominant tree species in the buffer area may help in the restoration of the plant communities in the long-run, provided protection means are strengthened and biotic stress reduced. © 2008, Penkala Bt.