West Sulawesi is locally well known for its rocky cliff beach along the coastline between Majene and Mamuju regency. Dato beach in Majene, for instance, is popular for tourism destination. In the area between Tamo, a small fisherman village and Dato can be found one rocky cliff beach with beautiful scenery. Cliff height varied between 5 m - 60 m. At the base of the rocky cliff stretched a fairly extensive mangrove which is separated from the cliff by the lagoon. This mangrove vegetation is thick, however, the species composition and structure remain unknown. Therefore, research is required to become important information in managing biological resources around the mangrove forest area. The research aims to know the species composition and structure of the mangrove communities in the Tamo rocky cliff beach. The sampling method used purposive sampling with four transects. All transects are combined with nested quadrat. A series of quadrat size, which is 1 x 1 m, 5 x 5 m and 10 x 10 m were used for counting the densities of mangrove seedling, stake, and trees respectively. All transect was set up crossing the mangrove area and perpendicular to the coastline. The result showed that mangrove composition consists of five true mangrove species, such as Avicennia marina, Bruguiera gymnorrhiza, Rhizophora mucronata, Rhizophora stylosa, Sonneratia alba with various associated mangrove species. Diversity and Evenness index was extremely low. In contrast, Simpson and Similarity index was high. Composition and structure of mangrove vegetation in Tamo rocky cliff beach dominated by monoculture stake of Rhizophora stylosa which is an importance value (IV) range between 182.90% - 300%.
The research about the biodiversity of gastropod has been conducted in seagrass meadow of Balangdatu waters, Tanakeke Island, South Sulawesi. The research aims to assess the diversity of gastropod species in Balangdatu waters. Sampling was conducted using quadrate transect method systematically. Three replicates of transect were applied for each station. The result indicates there were 34 species of gastropods from 14 genera and 14 families were found. Diversity index from every station varies from 1,661 to 2, 899. These values range from low to moderate. The diversity, Evenness, and dominance indices showed that Balangdatu waters still in good condition and sustain habitat for gastropod.
Teak Tectona grandis Linn is still used as the main product in the form of wood, while other products, especially environmental services have not received much attention. This study analyzed biomass, carbon stocks and decomposition rate of leaf litter in teak plantations in city forest of Hasanuudin University, Makassar. The individual biomass of teak plants is calculated using the allometric equation, Y=0.11x ρ x D2.62. Carbon stocks were analyzed using a formulation, C=0.47xB. The leaf litter decomposition rate is expressed as the ratio of the remaining litter dry weight, with the formulation, X= (A-B)/A. The number of teak plants in 5 sample plots were 239 trees with an average stem diameter of 20.6cm and an average height of 9.02m. Total biomass in 5 sample plots was 51,712.61g. Carbon stock in 5 sample plots was 24,304.92g. Decomposition rate average of leaf litter of 24.4g during 60 days incubation. The existence of teak plantations is able to reduce CO2 in the atmosphere by as much as 89,199.06gCO2 and resulting in a decomposition rate of teak leaf litter 0.4g per day
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