Density

The Bala-fort forest is located in the Sariska Tiger reserve in Alwar, Rajasthan (27o4’ to 28o4’ N and 76o7’ to 77o13’ E). It is a tropical dry deciduous forest with dense ground vegetation. The influence of spatial heterogeneity and soil nutrients was evaluated on the distribution and growth of selected common herb and shrubs on the west facing hill slope in this forest. The density of herb Achyranthes aspera was highest among the four selected species (3320 stems 100m-2) in the valley and lowest (1970 stems100m-2) in the middle part of the slope. Among the shrubs Justicia adhatoda exhibited highest density (42 stems 100m-2) in the valley, Grewia flavescens 34 stems 100m-2 at the base and Capparis sepiaria 17 stems 100m-2 in the valley. According to frequency, Capparis sepiaria exhibited clumped dispersion whereas the other three selected species showed uniform dispersion on the west facing hill slope in this forest. Achyranthes aspera exhibited lowest biomass (0.17 kg 100m-2) whereas Justicia adhatoda, Grewia flavescens and Capparis sepiaria showed 6.4, 6.6 and 2.5 kg 100m-2 total biomass respectively, in the study site. The growth of Achyranthes aspera and Justicia adhatoda in different micro-environments did not respond to four selected elements (Sodium, Potassium, Calcium and Phosphorus) whereas Grewia flavescens exhibited higher growth at low percentage of four elements. Capparis sepiaria showed higher growth at higher percentage than at lower percentage of selected elements. The results obtained indicate that distribution and growth of selected plant species was regulated by the elevation of slope, density of tree species and soil nutrients in this forest.