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Karakterisitik dan Sebaran Nitrat, Fosfat, dan Oksigen Terlarut di Perairan Karimunjawa Jawa Tengah Ulqodry, T. Zia; Yulisman, Yulisman; Syahdan, Muhammad; Santoso, Santoso
Jurnal Penelitian Sains Vol 13, No 1 (2010)
Publisher : Faculty of Mathtmatics and Natural Sciences

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Abstract

Perairan Karimunjawa merupakan bagian dari perairan Laut Jawa dengan potensi kekayaan hayati maupun non hayati yang cukup tinggi. Informasi terkini tentang karakteristik kimia perairan di perairan Kepulauan Karimum masih terbatas. Penelitian ini bertujuan mengkaji kembali tentang karakteristik dan pola sebaran zat hara (Nitrat dan Fosfat), dan Oksigen Terlarut di Perairan Kepulauan Karimunjawa. Penelitian ini dilakukan pada bulan april 2009 dengan menggunakan KR. Baruna Jaya VIII meliputi 13 stasiun pengamatan. Pengambilan sampel air dengan menggunakan Rossete sampler yang dilengkapi dengan botol Niskin pada lapisan permukaan dan dekat lapisan dasar. Kandungan nitrat dan fosfat dianalisis dengan menggunakan metoda Spektrofotometri pada panjang gelombang masingmasing 543 nm dan 885 nm. Kandungan oksigen terlarut diukur dengan menggunakan metode titrasi Winkler. Hasil yang diperoleh menunjukkan bahwa kandungan nitrat, fosfat dan oksigen terlarut Perairan Karimunjawa masih tergolong normal dan baik untuk kehidupan biota laut. Hasil analisis statistik menunjukkan bahwa kandungan nitrat di lapisan permukaan dengan dasar adalah berbeda sangat nyata. Kandungan fosfat, pH dan oksigen terlarut tidak berbeda nyata antara lapisan permukaan dengan lapisan dasar. Tinggi rendahnya kandungan nitrat, fosfat, dan oksigen terlarut di perairan ini dipengaruhi oleh masukan dari daratan, aktifitas plankton dan biota laut, serta pergerakan massa air. 
THE RATE OF 45Ca UPTAKE BY TWO CORALS SPECIES AT WATERS OF PULAU BURUNG, BANGKA-BELITUNG PROVINCE Dahlan, Zulkifli; Diansyah, Gusti; Ulqodry, T. Zia; Ania Citraresmin, Ania Citraresmin
Jurnal Ilmiah Aplikasi Isotop dan Radiasi Vol 6, No 2 (2010): Desember 2010
Publisher : BATAN

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Abstract

Coral reefs transplantation is the most technique used for coral reefs rehabilitation, at the present. Recently the 45Ca techniquehas been using for determining growth appearances in corals because of its ability to calculate the calcification process. For this reason, the study on the rate of 45Ca uptake by natural coralsAcropora formosa and Acropora nobilis was carried out between June and December 2009 at the waters of Pulau Burung Island, Bangka-Belitung Province. The coral fragments of about 5cm were harvested and put into a PVC container filled with 2 liters of fresh sea water, then incubated with 45CaCl2 solutions with an activity of 11.04 μCi/ml for 8 hour under fluorescent light. After the incubation, the “labeled” coral fragments were transplanted to where they have been taken from, and after such period will be re-harvested to determine their 45Ca uptake content. The results showed that the 45Ca technique was a reliable method to calculate the rate 45Ca uptake by coral fragments, which were studied in different depths and time periods of light exposure. There was a significant difference in the 45Ca uptake by the twodifferent coral species. A. formosa up took more 45Ca than A. nobilis did. The highest 45Ca uptake was shown by A. formosa at 5 m. This was true for all the lengths of time to light exposure (1, 3, 5 and 7 hours). Different pattern of 45Ca uptake showed by A. nobilis at 10 m depth, where it could be recognized that after a drop of 45Ca the uptake increase continuously until the end of the light exposure (7 hours). The difference in 45Ca uptake between the coral fragments is assumed to be influence by light and the algae species living symbiotically with the coral species that will further influence the CO2-fixation. This process will influence thecalcification process, which is expressed in 45Ca uptake. Further studies should be carried out to exactly gathered data of all the factors which could influence the calcification process by coral reefs, the factors could be CO2-fixation, flow of sedimentation, etc.