ZANSURYANI, KHAIRANI NAJIBAH (2023) KAJIAN POTENSI SERAPAN KARBON PADA RUMPUT LAUT Caulerpa racemosa (Agardh, 1817) dan Gracilaria verrucosa (Wildenow, 1805) YANG DIBUDIDAYAKAN DI TAMBAK BBPBAP JEPARA (23dik191). Undergraduate thesis, Fakultas Perikanan dan Ilmu Kelautan.

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Abstract

ABSTRAK
(Khairani Najibah Zansuryani. 26040119120009. Kajian Potensi Serapan Karbon Pada Rumput Laut Caulerpa racemosa (Fost, 1974) dan Gracilaria verrucosa (Gutsmuths, 1791) Yang Dibudidayakan di Tambak BBPBAP Jepara. AB Susanto dan Gunawan Widi Santosa).
Rumput laut memerlukan karbondioksida yang digunakan dalam proses fotosintesis. Kemampuan rumput laut dalam menyerap CO2 membuat rumput laut memiliki nilai tambah sebagai sumber ekonomi dan sebagai pengendali lingkungan global. Namun, kemampuan rumput laut sebagai agen penyerap CO2 belum banyak diketahui secara luas. Penelitian ini bertujuan untuk mengetahui jumlah serapan karbon dari kegiatan budidaya C. racemosa dan G. verrucosa di tambak BBPBAP, Jepara yang
dilaksanakan selama 45 hari. Luas Kawasan tambak budidaya rumput laut C. racemosa dan G. verrucosa di tambak BBPBAP, Jepara yaitu 3,2 dan 0,84 km2. Parameter kualitas air yang diuji meliputi pH, suhu, salinitas, nitrat dan fosfat. Hasil rerata uji parameter kualitas air menunjukkan bahwa nilai pH rumput laut C. racemosa dan G. verrucosa secara berturut – turut yaitu 7,75 dan 8, salinitas 26 – 30 ppt dan 25 - 30 ppt, suhu 27o – 30oC dan 27o – 33oC, nitrat 0 dan 0,016 mg/l, fosfat 0,008 dan 0 mg/l. Hasil
rata – rata analisa sampel rumput laut menggunakan metode analisa seacara gravimetri pada rumput laut Caulerpa racemosa diperoleh hasil analisa pada umur 30 dan 45 hari yaitu kadar air 0,96 dan 0,88, biomass 36,44 dan 8,02, kadar abu 46,30 dan 14,24, zat mudah menguap 39,25 dan 53,21, kadar karbon 13,48 dan 31,68. Sedangkan pada rumput laut Gracilaria verrucosa pada umur 45 dan 60 hari diperoleh kadar air 0,96 dan 0,63, biomass 17,86 dan 6,96, kadar abu 31,69 dan 15,39%, zat mudah menguap
65,13 dan 66,87, kadar karbon 2,22 dan 17,11. Nilai total serapan karbon pada rumput laut Caulerpa racemosa pada umur 30 dan 45 hari secara berturut – turut adalah 121,16 dan 5947,35. Sedangkan nilai total serapan karbon pada rumput laut Gracilaria verrucosa pada umur 45 dan 30 hari secara berturut – turut 16,6 dan 850,16.
Kata Kunci: Gracilaria verrucosa, Caulerpa racemosa, Sebar Acak, Parameter Kualitas Air, Analisa Gravimetri, Serapan karbon

ABSTRACT
(Khairani Najibah Zansuryani. 26040119120009. Assessment of Carbon Uptake Potential in Caulerpa racemosa (Fost, 1974) and Gracilaria verrucosa (Gutsmuths, 1791) Seaweeds Cultivated in BBPBAP Jepara Ponds. AB Susanto and Gunawan Widi Santosa).
Seaweed requires carbon dioxide which is used in the process of
photosynthesis. The ability of seaweed to absorb CO2 makes seaweed have added value as an economic source and as a global environmental controller. However, the ability of seaweed as a CO2 absorbing agent is not widely known. This study aims to determine the amount of carbon sequestration from C. racemosa and G. verrucosa cultivation activities in BBPBAP ponds, Jepara which were carried out for 45 days. The area of C. racemosa and G. verrucosa seaweed cultivation ponds in BBPBAP ponds, Jepara is 3.2 and 0.84 km2. Water quality parameters tested include pH, temperature, salinity, nitrate and phosphate. The average test results of water quality parameters showed that the pH values of C. racemosa seaweed and G. verrucosa were 7.75 and 8 respectively, salinity 26 - 30 ppt and 25 - 30 ppt, temperatures 27o - 30oC and 27o - 33oC, nitrates 0 and 0.016 mg/l, phosphates 0.008 and 0 mg/l. The average results of seaweed sample analysis using gravimetric analysis methods on Caulerpa racemosa seaweed were obtained from analysis at the age of 30 and 45 days, namely water content 0.96 and 0.88, biomass 36.44 and 8.02, ash content 46.30 and 14.24, volatile substances 39.25 and 53.21, carbon content 13.48 and 31.68. While in Gracilaria verrucosa seaweed at the age of 45 and 60 days obtained water content of 0.96 and 0.63, biomass 17.86 and 6.96, ash content 31.69 and 15.39%, volatile substances 65.13 and 66.87, carbon content 2.22 and 17.11. The total carbon sequestration values in Caulerpa racemosa seaweed at 30 and 45 days of age were 121.16 and 5947.35 respectively. While the total value of carbon sequestration in Gracilaria verrucosa seaweed at the age of 45 and 30 days respectively 16.6 and 850.16.
Keywords: Gracilaria verrucosa, Caulerpa racemosa, Random Scatter, Water Quality Parameters, Gravimetric Analysis, Carbon sink

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