EFFECTIVENESS OF MANGROVE VEGETATION FOR TRAPPING SEDIMENT IN MUARA BOJONG SALAWE, KABUPATEN PANGANDARAN, JAWA BARAT

• Main Author: Lestari, Esti
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/64255
• Institution: Institut Teknologi Bandung

Muara Bojong Salawe is an estuary area in the Pangandaran which is a meeting of three rivers, namely Cijalu, Cikiray and Cijulang. This area is included in the category of active estuary, but in the middle of the estuary has been superficiality as a result of high sedimentation. This has an impact on the inhibition of fishing activities, especially boat transportation to the sea. The existence of mangrove vegetation in this area have not maximal to trap sediment that is carried from the headwaters of the river or the results of abrasion around the coast. This study aims to determine the characteristics of mangrove vegetation and sediment, then determine the relationship between sedimentation rate and some parameters of mangrove vegetation. Sedimentation rates were measured using sediment traps placed in the three rivers, followed by measurement of the parameters of mangrove vegetation on 10 x 10 meter placed at three locations. Vegetation parameters calculated were tree density, sapling density, seedling density, root density and root diameter. The results showed the average of sedimentation rate of the three rivers was 0,096 ton ha-1 year-1 with the texture of sediment in the form of sandy loam and sandy clay. Vegetation parameter measurement results indicate that there are three mangrove species, namely Rhizophora mucronata, Avicennia alba and Sonneratia alba. The tree density values for the Cikiray, Cijalu and Cijulang were 256 individuals ha-1, 167 individuals ha-1 and 656 individuals ha-1. While the sapling density values was 1689 individuals ha-1 (Cikiray), 356 individuals ha-1 (Cijalu) and 756 individuals ha-1 (Cijulang). The average root density and diameter for the Cikiray River were 23 root m-2and 2,77 cm, the Cijalu River were 98 root m-2 and 2,76 cm, while the Cijulang River were 25 root m-2 and 1,93 cm. Statistical test results show that there is a relationship between sedimentation rate and vegetation parameters with a value of R2 = 0,90 which results in the equation Y = 0 – 0,00094 X1 + 0,00023 X2 + 0,0027 X3 +0,12 X4; where X1 is the density of the tree, X2 is the density of the sapling, X3 is the density of the root and X4 is the diameter of the root.