Anna Ida Sunaryo Purwiyanto1,
Tri Prartono2), Alan Frendy Koropitan2)
1*). Program Studi Ilmu Kelautan, FMIPA – Universitas Sriwijaya, Palembang,
Sumatera Selatan 30662, Indonesia
2). Departemen Ilmu Kelautan, FPIK – IPB, Kampus IPB Darmaga Bogor 16680,
Indonesia
ABSTRACT
The reclaimed mangrove estuary in Muara Angke Kapuk is a reclaimed area that has
not evaded the impacted of pollution and waste in the areas surrounding
Cengkareng, Jakarta. This is apparent from the fact that almost all sediments
under the mangrove trees are buried
under heaps of plastic trash. However, the reclaimed region still has
variety of organism, which indicating that the region still has an internal carrying
capacity, especially nutrients from sediment. The purpose of this research was to examine the condition
of sediment nutrients in this mangrove reclamation region. The research was conducted by taking
water samples using a modification of the stratified cup at a sediment depth of
0-15 cm with depth intervals of 2.5 cm, and taking sediment samples using the sediment ring. Pore water samples
were measured for dissolved oxygen (DO) and concentrations of ammonia, nitrite,
nitrate, and phosphate. Sediment samples were used to obtain porosity values.
The data obtained is used to make vertical
concentration profiles and analysis of vertical nutrient flux. Vertical
nutrient flux analysis was performed with the aid of QUAL2K software version
2.11. The results showed different vertical distributions and flux of
nutrients, where influx for ammonia and phosphate and an increase in
line with increasing sediment depth, while nitrate efflux and a decreased concentration. The flux calculation of nitrite as transitory nutrient was not done, but the concentration
decreased after a depth of 2.5 cm. This indicates that the high contamination
on the surface does not prevent the natural chemical processes so the reclaimed region can still
provide nutritional support for its organism.
Keywords : porewater, nutrient, fluxes,
sediment, Muara Angke Kapuk
Makara Journal , 2012, 16(3) : 197-202
http://journal.ui.ac.id/index.php/science/article/view/1482/1280
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