MODEL KONSERVASI DAN TATA GUNA LAHAN SUB-SUB DAS MALINO BERBASIS TINGKAT BAHAYA EROSI

RAHMAT SOLEH. Conservation and Land Use Model for Malino Sub-Watershed Based on Erosion Hazard Level. Supervisors: DOROTHEA AGNES RAMPISELA and SYAMSUL ARIFIN LIAS.

Background. The Malino watershed with an area of 8,585.2 ha is one of the most important areas in the Jeneberang watershed unit. This area has a role as a water supplier for the Bili-Bili Reservoir and is a horticulture center area. High industrial activity indicates this area is vulnerable to erosion. Aim. This study aims to determine the rate of erosion, the level of erosion hazard and alternative scenarios to reduce the amount of annual soil erosion TSL. Method. This research was conducted by applying the USLE model. The erosion rate is then compared with the tolerated erosion value (TSL) to determine the Erosion Hazard Index (IBE) as a consideration in the style of protection and land use. Results. Erosion on each land unit varies greatly, dominated by heavy erosion of 180-480 tonnes/ha/year. IBE in the low category is only 1707.4 ha consisting of forest (1858.4 ha) and paddy fields (529.4 ha). The land classified as high IBE covers an area of 5000.7 ha consisting of shrubs, mixed dry agricultural land and dry moor. Based on the 6 scenarios developed, it is found that scenarios 4, 5 and 6 are effective in reducing erosion to less than or equal to the TSL. Conclusion. Weighted erosion in the Malino watershed is 200.2 tonnes/ha/year with IBE dominated by the high category of 5712.6 ha. Efforts to control erosion that can be carried out are by directing shrubs and land with slopes > 45% to prioritize forest land cover, then other lands are directed to implement several conservation actions.