DINAMIKA NUTRIEN PADA EKOSISTEM MANGROVE DI PANTAI BEDONO KECAMATAN SAYUNG KABUPATEN DEMAK

PARTAYA, Prof.Dr.Ir.Chafid Fandeli,M.S;Prof.Dr.Sunarto,M.S;Prof.Dr.Suwarno Hadisusanto,M.S

2017 | Disertasi | S3 Ilmu Lingkungan

Ekosistem mangrove Desa Bedono telah mengalami perubahan karena tererosi oleh gelombang dan arus air laut serta tergenang pada saat air laut pasang. Keadaan ini mempengaruhi kandungan nutrien/hara dan biota yang hidup di ekosistem mangrove tersebut. Penelitian ini bertujuan mengkaji dinamika nutrien di sedimen dan perairan ekosistem mangrove, menganalisis vegetasi hutan mangrove serta komunitas makrobentos. Selanjutnya menganalisis korelasi dan regresi antara kandungan nutrien dengan vegetasimangrove dan makrobentos yang ada di lingkungan mangrove. Hasil penelitian diperoleh kandungan nutrien di sedimen berkisar 7,83% (C organik), 1100 ,3600 ppm (N total), 11,01,91,25 ppm (P tersedia), dan 6,70 me/100 gram (K tersedia). Untuk nutrien di perairan diperoleh 0,047 (C organik), 0,970 10,617 ppm (N total), 0,00 1,33 ppm (P tersedia), dan 0,04 3,18 me/100 gram (K tersedia). Kandungan nutrien yang tinggi dijumpai di sedimen dan nutrien di perairan termasuk sedang. Untuk jenis tumbuhan mangrove didominasi oleh Avicennia marina dengan kerapatan 8,36 19,83 pohon/100m2. Anak pohon mangrove didominasi oleh Rhizophora mucronata. Makrobentos yang ada di ekosistem mangrove sebanyak 19 jenis yang didominasi oleh Cassidula sulculosa yang melimpah pada bulan Maret 2016 sebanyak 16,4 individu/m2danNatica fasciata sebanyak 59,4 individu/m2. Kemelimpahan makrobentos tersebut didukung oleh kandungan nutrien yang tinggi di bulan Maret 2016. Uji MANOVA menunjukkan bahwa lokasi pengambilan sampel terhadap nutrien dan kerapatan mangrove terdapat perbedaan yang signifikan dan waktu (bulan) signifikan terhadap kelimpahan makrobentos dan indeks keanekaragaman makrobentos.

The Mangrove Ecosystem of Bedono, Demak has changed; It is caused by the ocean wave and current; also it is stagnanted during the sea water rises. This situation affects the nutrient and the mangrove organisms that live in. The objectives of the study are to analyze the dynamics of nutrient in the sediments and water of the Mangrove Ecosystem, the vegetation of the Mangrove Forest and the community of macrobenthos. For further study, It is to find out the correlation and regretion between nutrient contents with the vegetation of mangroveand macrobentos in the Mangrove environment. The results of the research were obtained the nutrient in sediments ranges from1.13- 7.83%0(C organic); 1100-3600 ppm (N total); 11.01-91.25 ppm (P Available); and 1.48-6.70 me/100 grams (K). For nutrient in the water is obtained from 0.047 to 0.173%09 (C organic), 0.970 to 10.617 ppm (N total); 0,00 to 1.33 ppm (P Available) and 0.04 to 3.18 me/100 grams (K available). The high nutrient found in sediments while the nutrient in the water is medium. Type of the Mangrove plants are dominated by Avicenia Marina which has density of 8,36 19,83 trees / per 100m2; The macrobenthos that exist in that Mangrove Ecosystem are 19 species dominated by Cassidula Sulculosawhich is abundant in March 2016 as much as 16.4 an individual per m2 and Natica Fasciata as many as 59,4 an individual per m2. The abundance of macrobenthos is supported by the high of nutrient contents in March 2016.MANOVA test showed that the sampling sites to the mangrove density and nutrients there are significant differences and time (months) significantly influence the abundance and diversity index of macrobentos.

Kata Kunci : mangrove,C Organic,N Total, P Available, macrobenthos