ABSTRAK Ekosistem mangrove merupakan salah satu ekosistem yang ada di kawasan pesisir dan memiliki peranan penting untuk lingkungan dan mahluk hidup. Penelitian terkait ekosistem mangrove menjadi latar belakang dilakukannnya penelitian yang bertujuan; I) mengidentifikasi jenis mangrove. 2) Mengetahui peran penting mangrove. 3) mengetahui kontribusi ekologis mangrove di desa lajing dan bandaran. Metode yang digunakan dalam pengambilan data yaitu metode observasi dan metode studi pustaka dengan analisa kerapatan relatif jenis, frekuensi relatif jenis, penutupan relatif jenis, indeks nilai penting, indeks keanekaragaman, indeks keseragaman, dan indeks dominansi. Hasil dari penelitian ini yaitu; 1) Jenis mangrove yang ditemukan di desa lajing yaitu; Rhizopora stylosa, Rhizopora mucronata, Rhizopora apiculata, Bruguiera gymnorrhiza, Soneratia alba. Di desa bandaran di temukan: Avicennia alba, Rhizopora mucronata, Rhizopora stylosa, Soneratia alba. 2) Indeks nilai penting (INP) mangrove di lajing dan bandaran, memiliki kisaran nilai 36,791-152,710 (memiliki kontribusi terhadap Iingkungan rendah sedang). 3) Struktur komunitas mangrove di di lajing dan bandaran, menunjukkan penyebaran jumlah individu tiap spesies sedang (H ’ = 0,68- 1,30); komunitas berada dalam kondisi labil stabil dan keseragaman sedang tinggi (E = 0,93- 0,99); dan dominansi rendah (D = 0,28- 0,50). Kata Kunci : Mangrove, Indeks Nilai Penting (INP), Stuktur Komunitas

ABSTRACT Mangrove ecosystem is one of the ecosystems that exist in coastal areas and has an important role for the environment and living creatures. The related research about the ecosystem mangrove becomes the background the research, which has aims such as; 1) identifying kinds of mangrove, 2) knowing the important role of mangroves, 3) knowing the contribution of ecological mangrove in vellage Lajing n Bandara. This research used observation and literatur study method with an analysis of relative density types, relative frequency types, relative closure types, important vaue index, diversity index, uniformity index, and dominance index. The result of the research are;1) the kinds of mangrove found in village lajing; Rhizopora stylosa, Rhizopora mucronata, Rhizopora apiculata, Bruguiera gymnorrhiza, Soneratia alba. In the village bandaran found Avicennia alba, Rhizopora mucronata, Rhizopora stylosa, Soneratia alba. 2) index value (Indeks Nilai Penting (INP)) of mangrove in village Lajing and Bandaran has value 36,791-152,710 (has contributed to the low-medium environment of mangrove). 3) the structure of mangrove community in village Lajing and Bandaran, shows the spread of individual number of each medium species (H ’ = 0,68- 1,30); the stable condition of community-stable and medium-high uniformity,(E = 0,93- 0,99);and low dominance (D = 0,28- 0,50). Keywords: Mangrove, important value index, community structure.

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