Abstract
Forest coverage has changed regarding to structure and size, which further causes forest fragmentation. Forest cover change of Samosir Island disrupts the forest ecosystem. This research were aimed to determine the land cover changes in Samosir Island of year 2005, 2011 to 2015 and to determine fragmentation degree in Samosir Island’s forest. This research was carried out in four step such as delineation of watershed, image analysis, land cover changes analysis, and fragmentation analysis. The four sub-watershed of Samosir Island were divided into four aspect maps. Research found that during the period of 2005 to 2015, Samosir Island had 10 land cover classes; there were water body, forest, mixed garden, dry land farming, bare land, grassland, settlements, swamp, paddy field, and shrubs. Within the period of 2005 to 2011, the largest land cover change was 3.912,02 Ha of converted forest into mixed farm. During the period of 2011 to 2015, the change from forest to shrubs was 3.334,671 Ha and during period 2005 to 2015, the change from forest to shrubs was 4.137,277 Ha. The Samosir island’s forest in 2005 – 2015 was classified as the lowest class fragmentation of the west sub-watershed, moderate class fragmentation of the South sub-watershed, and highest-class fragmentation of the north sub-watershed.
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