Nitrogen pada sedimen berperan dalam proses fotosintesis, respirasi serta pembentuk protein bagi tanaman. Tujuan penelitian adalah untuk mengetahui kandungan nitrogen (N) pada sedimen berdasarkan kedalaman 10 cm, 20 cm dan 30 cm di kawasan hutan mangrove Kelurahan Mamburungan Kota Tarakan. Penelitian ini dilaksanakan pada bulan Februari sampai dengan bulan April 2018 metode yang digunakan dalam penelitian ini yaitu deskriptif kuantitatif dengan mendeskripsikan kandungan Nitrogen berdasarkan kedalam di setiap stasiun penelitian. Pengambilan sampel sedimen dilakukan di 3 titik stasiun yaitu daerah pertambakan, pemukiman dan muara sungai dengan 3 kali pengulangan. Kandungan nitrogen pada sedimen di kedalaman 10 cm berkisar 0,61-1,69 %, kedalaman 20 cm berkisar 0,89-1,03% dan kedalaman 30 cm berkisar 1,00-1,08% di Hutan Mangrove Mamburungan Kota Tarakan.
Kata Kunci: Mangrove, Nitrogen, Sedimen, Mamburungan

Nitrogen in sediments has a function as photosynthesis, respiration and protein forming for plants. The purpose of this research was determine the nitrogen (N) content in sediments based on depth 10 cm, 20 cm and 30 cm in the mangrove forest area of Mamburungan in Tarakan City. This research was conducted from February to April 2018 the method used in this research is quantitative descriptive by describing the nitrogen content based on depth at each research station. Sampling was carried out at 3 different stations, namely pond farms, residential areas and estuary and carried out 3 repetitions. The result from the reseach nitrogen value is obtained based on sedimenth depth of 10 cm that is 0,61-1,69%, 20 cm that is 0,89-1,03% and 30 cm that is, 1,00-1,18% in mangrove forest Mamburungan Tarakan City. Keywords: Mangrove, Nitrogen, Sediment, Mamburungan