Judul: Cadangan Karbon Tegakan Mangrove di Desa Pasar Banggi Kabupaten Rembang, Jawa Tengah
Abstrak: Mangroves are usually used as a prevention of coastal erosion and the fish farming (ponds). Ecologically mangrove has potential as carbon stocks. Mangroves that located in Pasar Banggi Village Rembang Regencyhave a function as conservation area. There are four types of mangroves such as Rhizophora mucronata, Rhizophora apiculata, Sonneratia alba, and Avicennia marina. The purposes of this study are to calculate the biomass,the carbon stocks and CO2 sequestration estimation using per tree method and midpoint diameter calculation method. The result showed that the value of the biomass, carbon stocks, and CO2 sequestration consecutively are 81.274 ton/ha, 38.199 ton/ha, dan 140.190 ton/ha. The use of midpoint diameter calculation method can not be applied to find out the value of the biomass, carbon stocks, and CO2 sequestration in mangrove of Pasar Banggi Village Rembang Regency because it has a significant difference.
Keyword: Bogor Agricultural University (IPB), estimation, CO2 sequestration, carbon stocks, biomass, mangrove

Judul: Estimasi Cadangan Karbon dan Serapan CO2 di Atas Permukaan Tanah pada Tegakan Mangrove di Kabupaten Rembang, Jawa Tengah
Abstrak: Mangrove biasanya difungsikan sebagai upaya pencegahan abrasi pantai. Hutan mangrove di Kabupaten Rembang terletak pada dua desa, yaitu Desa Pasar Banggi dan Desa Tireman. Tujuan penelitian ini untuk mendapatkan informasi mengenai serapan CO2 pada tegakan mangrove di Desa Pasar Banggi dan Desa Tireman, Kabupaten Rembang. Jenis mangrove yang ditemukan dalam penelitian ini adalah Rhizophora mucronata, Rhizophora stylosa, Rhizophora apiculata, dan Avicennia marina. Penelitian ini dilaksanakan pada bulan Juni-Juli 2022. Pembuatan plot menggunakan metode transek jalur dengan purposive sampling. Biomassa atas permukaan tanah dihitung menggunakan persamaan alometrik dan dikalikan dengan faktor konversi biomassa ke karbon sebesar 0, 47 (IPCC 2006) untuk memperoleh cadangan karbon kemudian dikalikan dengan atom relatif C agar diperoleh serapan CO2 mangrove. Hasil penelitian menunjukkan bahwa kerapatan mangrove tidak begitu mempengaruhi besarnya biomassa serta cadangan karbon. Kerapatan mangrove tertinggi sebesar 8400 ind/ha. Biomassa memiliki hubungan yang positif dengan cadangan karbon dan serapan CO2. Nilai biomassa atas permukaan tanah tertinggi terdapat pada stasiun 3 sebesar 740,69 ton/ha dan biomassa atas permukaan tanah terendah pada stasiun 4 sebesar 348,46 ton/ha. Nilai diamater mempunyai pengaruh yang besar terhadap nilai biomassa. Mangrove di Kabupaten Rembang memiliki cadangan karbon di atas permukaan tanah sebesar 281,18 ton/ha dengan kemampuan penyerapan CO2 sebesar 206,30 ton/ha/tahun., Mangroves usually function to prevent coastal abrasion. Mangrove forests in Rembang Regency are located in two villages, namely Pasar Banggi Village and Tireman Village. The purpose of this study was to find out information about the estimated amount of CO2 absorption in mangrove stands. The types of mangroves found in this study consists of Rhizophora mucronata, Rhizophora stylosa, Rhizophora apiculata, and Avicennia marina. This research was conducted in JuneJuly 2022. Plots were determined using a path transect method with purposive sampling. The aboveground biomass was calculated using an allometric equation and multiplied by a biomass-to-carbon conversion factor of 0.47 (IPCC 2006) to obtain the value of carbon stocks and then multiplied by the relative atomic mass of C to obtain the value of CO2 absorbed by the mangroves. The results showed that mangrove density did not significantly affect the amount of biomass and carbon stock. The highest mangrove density reached 8400 ind/ ha. Biomass provided a positive relationship with carbon stocks and CO2 uptake. The highest aboveground biomass value was found at station 3 reaching 740,69 tons/ha and the lowest aboveground biomass was at station 4 of consisting 348,46 tons/ha. The diameter value has a large influence on the biomass value. Mangroves in Rembang Regency have above-ground carbon stocks of 281,18 tons/ha with a carbon sequestration capacity of 206,30 tons/ha/year.
Keyword: mangrove, biomass, carbon, carbon stock, CO2 sequestration

Judul: Evaluation of Influenza Antibody Titers in Serum and Egg Yolk of Layers Vaccinated with Influenza Vaccines.
Abstrak: Influenza belongs to the Orthomyxoviridae family which causes upper and lower respiratory tract infection. The aim of this study was to evaluate influenza-A specific antibody titers from serum and egg yolk of hens vaccinated with quadrivalent influenza vaccines. Three Hy-line Brown layers were vaccinated with quadrivalent influenza type A and B inactivated vaccines. Vaccination was carried out three times at a dose of 0.25 ml/chicken via the intramuscular route. The first vaccination was carried out at 24 weeks of age, then boosters were performed at 28 and 32 weeks of age. Serum and egg yolk were collected every week for 20 weeks since the first vaccination. Influenza A H3N2 and H1N1 antibody titers were determined using hemagglutination-inhibition (HI) test and agar-gel-precipitation (AGP) test. Influenza-A H3N2 and H1N1 specific antibodies were detected in both serum and egg yolk from the first to twenty weeks after the initial vaccination. Highest HI geometric mean titer (GMT) of H1N1 antibody reached 26.67 HIU at nine weeks post first vaccination (p.f.v), while H3N2 antibody reached 26 HIU at six weeks p.f.v. Our result showed that influenza antibodies can be produced in layers using quadrivalent vaccines and layer chickens are able to produce equivalent antibody levels for each influenza subtype.
Keyword: antibody, egg yolk, influenza, layer chickens, serum