IMPACT OF DISTURBANCE ON PHYTODIVERSITY IN UNDISTURBED AND DISTURBED CATCHMENT AREAS OF SERLUI RIVER IN VICINITY OF SERLUI-B HYDEL PROJECT, MIZORAM, NORTH-EAST INDIA
The present study was conducted to assess the phytodiversity and economical importance of plant species in the undisturbed and disturbed zones of Serlui-B hydel project which is being constructed on Serlui river in Kolasib district of Mizoram, India. The present study records a total of 82 species belonging to 41 families and 71 genera from both the selected study sites. 70 species belonging to 39 families and 63 genera were found in the undisturbed site whereas 37 species belonging to 16 families and 34 genera were observed in the disturbed site. The similarity index calculated was found to be 0.24 between the undisturbed and disturbed stands. Effect of disturbance along the disturbance gradient and a decrease in species diversity and distribution was recorded. Construction of dam has led to removal of majority of the dominant tree species with secondary growth. The results also indicate that the species dominant at the disturbed site maybe tolerant to stress and able to survive under such harsh influence of disturbance. On the other hand, species sensitive to the disturbance shows poor growth rate and some species were totally eliminated from the disturbed site due to the increased stress caused due to the degree of disturbance.
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