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Mangrove menghasilkan serasah yang akan mengalami proses dekomposisi yang kemudian dimanfaatkan sebagai sumber hara bagi tanaman dan juga merupakan sumber makanan bagi ikan serta invertebrata yang penting. Tujuan dari penelitian ini adalah untuk mengukur dekomposisi serasah daun R. apiculata dan mengetahui kandungan unsur hara karbon (C), nitrogen (N) dan fosfor (P) pada serasah daun Rhizophora apiculata yang dilepas selama proses dekomposisi. Penelitian dilakukan pada bulan Februari hingga Mei 2017 di Desa Bagan Asahan Kecamatan Tanjungbalai Kabupaten Asahan Provinsi Sumatera Utara. Penentuan stasiun penelitian menggunakan metode purposive sampling pada tiga stasiun dengan penentuan stasiun berdasarkan pengamatan ketersediaan jenis mangrove R. apiculata. Hasil penelitian menunjukkan laju dekomposisi serasah daun R. apiculata pada hari ke-90 yaitu pada stasiun I bernilai 13,04 stasiun II bernilai 11,42 dan stasiun III bernilai 10,24. Kandungan unsur hara karbon selama proses dekomposisi 90 hari yaitu stasiun I sebesar 16,24 %, stasiun II sebesar 15,29% dan stasiun III sebesar 15,42 %. Unsur hara nitrogen yang terdekomposisi pada hari ke 90 yaitu stasiun I sebesar 2,69%, stasiun II sebesar 2,57 % dan stasiun III sebesar 2,75%. Kandungan unsur hara fosfor selama proses dekomposisi 90 hari yaitu stasiun I 0,02 %, stasiun II 0,02 % dan stasiun III 0,01 %. Mangroves produced litter that will undergo decomposition process which used as a source of nutrients for plants and also source of food for fish and important invertebrates. The purpose of this research is to measure the decomposition of Rhizophora apiculata leaf litter and to know the content of carbon (C), nitrogen (N) and phosphorus (P) nutrient in leaf litter of R. apiculata released during the decomposition process. The research was conducted from February to May 2017 in Bagan Asahan Village, Tanjungbalai District, Asahan Regency, North Sumatera Province. The method of this research used purposive sampling and determined three stations sampling based on observation of availability R. apiculata mangrove species. The result showed that decomposition rate of R. apiculata leaf on the 90 day at station I was 13,04, station II was 11,42, and station III was 10,24. The content of carbon nutrients during the 90 day decomposition process in station I was 16.24%, station II was 15.29% and station III was 15.42%. Nitrogen nutrient elements decomposed on the 90 day were station I was 2.69%, station II was 2.57% and station III was 2.75%. Phosphorus nutrient content during 90 day decomposition process was 0,02% for station I, 0,02% for station II and 0,01% for station III.

Dekomposisi serasah daun mangrove Rhizophora apiculata di Desa Bagan Asahan, Kecamatan Tanjungbalai, Kabupaten Asahan, Provinsi Sumatera Utara