Laju Dekomposisi Serasah Daun Avicennia Marina di Perairan Pulau Sembilan Kecamatan Pangkalan Susu Kabupaten Langkat Provinsi Sumatera Utara

Abstract

The mangrove litter which has been decomposed contributes organic matter as food source for many species of fish and other organisms in the mangrove ecosystem. The purpose of this research is to know the decomposition rate of A. marina litter leaf and to know the nutrient content of carbon (C), nitrogen (N) and phosphorus (P) in the A. marina litter leaf which been released during the decomposition time. This research was done at Nine Island Pangkalan Susu base Langkat sub-district of North Sumatera Province during March until Mei 2016. This research used purposive sampling method at three stations and the determination of the station is done by seeing the availability of A. marina at the Nine Island. The results showed that the decomposition rate of A .marina litter leaf on day 75 are 11,13 in stasiun I, 10,94 in station II and 10,50 in III station. The fastest decomposition rate is the station I with 11,13 and the slowest decomposition rate is the station III with 10,50. The nutrient of carbon during decomposition in 75 days are 10,46% at station I, 10,75% at station II and 11,03% at station III. Nutrientof nitrogen which been decomposed on day 75 are 0,98% in station I, 1,18% in station II and 0,10% in station III. Nutrient of phosphorus during decomposition in 75 days are 0,10% in station I, 0,11% in station II and 0,10% in station III.