PATTERN OF LAND COVER CHANGE TOWARDS TOTAL EROSION IN CIMANUK UPSTREAM SUB WATERSHED

Abstract

Changes in land use are defined as the increasing of the use of the land from one side use to another followed by a reduced area, or changes in land function at different times. Land degradation and soil erosion are often associated with loss of forest cover, but also caused by poor land use practices (overgrazing, cleaning, land clearing and organic matter destruction clearing). The main aim of this work is to analyze the pattern of land cover changes to the total erosion in Cimanuk upstream sub- watershed. The results showed that there were some changes over the land from conserved area to cultivation area. Land use composition in 2009 of the studied area with a total of 146,847.4 ha: conserved and cultivation area are 13.78% and 86.32% respectively. Meanwhile, based on USLE calculation analysis, the total erosion in this sub-watershed reaches 103,475,098.62 ton from which erosion on the conserved areas and cultivated ones are 6,644,401.22 and 96,830,697.40 ton respectively. The relationship function of total erosion of the conserved areas (TEpt) to the width of this area (Aqt) is TEqt = (130.76 * Aqt) + (3 x 10‘) with R2 = 0.8288. On the other hand, relationship function of total erosion of the cultivation regions (TEgg) to the width of this area (ABB)is TEKB' (838.59 * AKB)" (2 x 107) with R2 = 0.8261. Based on the width of conserved and cultivation regions, and total erosion of respected study area projection, a monogram of land use changes and erosion was obtained from which can be used to predict land use changes pattern until 2050.