ANALISIS KANDUNGAN BAHAN ORGANIK, NITRAT, FOSFAT PADA SEDIMEN DI KAWASAN MANGROVE JENIS Rhizophora DAN Avicennia DI DESA TIMBULSLOKO, DEMAK

Retnoayu Budiasih, - Supriharyono, Max Rudolf Muskananfola

Abstract


Mangrove di Desa Timbulsloko, Kecamatan Sayung, Kabupaten Demak telah banyak mengalami kerusakan. Namun saat ini kawasan mangrove tersebut sudah mengalami rehabilitasi. Kawasan yang dulunya digunakan sebagai lahan pertambakan, sekarang beralih fungsi sebagai hutan mangrove. Daerah tersebut diperkirakan akan berpengaruh terhadap distribusi kandungan bahan organik, nitrat dan fosfat. Penelitian ini bertujuan untuk mengetahui kandungan Bahan Organik Total, nitrat dan fosfat pada sedimen dan untuk mengetahui sebaran antar stasiun, antar kedalaman dan pasang surut dari setiap variabel di ekosistem mangrove di Desa Timbulsloko, Demak. Metode yang digunakan dalam penelitian ini adalah metode deskriptif, pengambilan sampel dilakukan dengan metode purposive sampling. Pengambilan sampel sedimen di kedalaman 0, 15 dan 30 cm dan pengambilan sampel air dilakukan di tiga titik tiap stasiunnya. Stasiun I mangrove Rhizophora, stasiun II gabungan Rhizophora dan Avicennia dan stasiun III mangrove Avicennia. Pengambilan sampel dilakukan saat pasang dan surut. Hasil penelitian menunjukkan bahwa kandungan Bahan Organik Total, nitrat dan fosfat pada sedimen dan dalam air secara keseluruhan menunjukkan tingkat kesuburan yang sedang sampai tinggi. Pada satsiun I rata – rata bahan organik pada sedimen saat pasang dan surut berturut – turut (11,32 %) dan (16,073 %). Stasiun II (12,5 %) dan (15,81 %) dan stasiun III (10,087 %) dan (12,987 %). Kandungan nitrat stasiun I (5,791 ppm) dan (7,478 ppm). Stasiun II (8,115 ppm) dan (8,419 ppm) dan stasiun III (9,462 ppm) dan (11,037 ppm). Sedangkan kandungan fosfat pada stasiun I rata – rata saat pasang dan surut (4,023 ppm) dan (3,933 ppm). Stasiun II (3,737 ppm) dan (4,738 ppm) dan pada stasiun III (5,549 ppm) dan (5,808 ppm).

 

Mangrove at Timbulsloko village, Sayung sub-district, Demak regency showed a level of damaging. In order to manage, the local government then rehabilitate those areas. The areas which were used as fish ponds have been changed their function as mangrove forest. With such condition, it is predicted that distribution of material organic, nitrate and phosphate contents will be changed. The aim of this study is to find out the  total organic contents, nitrate, and phosphate inside sediment, as well it is to find inter station, deep and tidal current condition distribution of the contents. The study usaged the descriptive method, while for the collection data samples using purposive random sampling. The sediment sampling in the depth of 0, 15 and 30 cm, while for the water sampling from three sites in station, i.e. station I mangrove Rhizophora, station II combination Rhizophora and Avicennia and station III  mangrove Avicennia. These sampling were conducted in both tidal current condition, i.e high and ebb tide. The result of this study showed that the total organic contents, nitrate and phosphate inside the sediment is in medium to high fertility ranged. In station I, the average organic contents during both high and ebb tide were (11,32%) and (16,073%). Station II (12,5%) and (15,81%). Station III  (10,087%) and (12,978%). The nitrate contents in station I (5,791 ppm) and (7,478 ppm). Station II (8,115) and (8,419 ppm). Station III (9,462 ppm) and (11,037 ppm). While the phosphate contents during both high and ebb tide in station I (4,023 ppm) and (3,933 ppm). Station II (3,737 ppm) and (4,738 ppm). Station III (5,549 ppm) and (5,808 ppm).


Keywords


Bahan Organik Total; Nitrat; Fosfat; Sedimen; Air

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