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Master J.,Lampung University | Tjitrosoedirdjo S.S.,South East Asian Regional Center for Tropical Biology | Qayim I.,University of Indonesia | Tjitrosoedirdjo S.,South East Asian Regional Center for Tropical Biology

Bukit Barisan Selatan National Park (BBSNP) is the third largest protected area in Sumatra. Unfortunately, the area is now invaded by Merremia peltata or mantangan occupying about 7000 ha of the area. The aim of this study was to determine the ecological impacts of mantangan on plant species composition at BBSNP. Three sites with different disturbance regimes were selected for vegetation analysis and assessment on plant species composition: primary forest representing undisturbed area, secondary forest representing burned area, and invaded forest representing forest invaded by mantangan. Three line transects were constructed at each locations along 1 km, and the nested sampling plotswere set up every 100m with the following quadrant's size: 20mx 20mfor trees, 10m x 10mfor poles, 5m x 5mfor sapling, and 2mx 2mfor seedling. Data collection covered the degree of mantangan invasion, trees species and diameter. Results showed that invaded forest has lower plant diversity index (1.90) than the other two forests. This was caused by the invasion of mantangan as the percentage of coverage in the invaded forest reached 44% compared to secondary and the primary forest, whichwere 27.11% and 1.00%, respectively. Percentage of mantangan coverage and diversity showed a strong negative correlation (-0.988). Source

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