The present study attempts to determine rainfall erosivity in Aizawl District, Mizoram by applying the Modified Fournier Index using rainfall data for 35 years. The obtained average annual rainfall erosivity is 360.86 (MFI value), which revealed chances of very severe rainwater induced soil erosion. A significant variation was observed among seasonal erosivity where monsoon has the highest mean MFI value of above 250 and contributes 77.59% of the annual rainfall erosivity, while it is only 6.48 (1.98%) in the winter season. The rainfall data and the erosivity values have a strong relationship (r = 90) which was also reflected in the declining trend of both the data during the study period. The northern parts of the study area have the highest rainfall erosivity, which slightly declined towards the south. The research findings may provide a valuable pre-requisite information to policymakers for preparing an effective plan for soil erosion control and management.
Soil Erosion, Rainfall erosivity, Modified Fournier Index, Aizawl District, Spatiotemporal variation
