Global Warming Potential of Carbon dioxide and Methane Emission from Mangrove Sediment in Waiheru Coastal, Ambon Bay.

Abstract

Mangroves can store carbon. However, it also produces carbon emissions by degrading organic matter in mangrove sediments. This research was conducted in a mangrove ecosystem at Waiheru, in the inner Ambon bay, to determine CO2 and CH4 emissions and their potential for global warming (GWP) from mangrove sediments. Gas is taken through a syringe mounted on the hood. Gas concentration analysis used the gas chromatography method, while the average gas concentration in each sediment was tested using ANOVA Single Factor. The results showed that the average concentration of CO2 gas was significantly different for each sediment (P-value <0.05), while the average concentration of CH4 gas was not significantly different (P-value >0.05). The largest CO2 gas emission in mangrove sediments in Waiheru Village was found in sandy mud sediments with an emission value of 136.99 mg.m−2.h−1, and the lowest was in sand sediments, namely 13.01 mg.m−2.h−1. Meanwhile, the largest emission of CH4 gas was in silty sand sediments, namely 0.32 mg.m−2.h−1, and the lowest was in sandy mud sediments, namely 0.15 mg.m−2.h−1. Fluctuations in carbon gas emissions in each sediment are inversely proportional, which indicates that the formation of CH4 gas is obtained through ethanol reduction, which utilizes CO2 gas concentrations. The total GWP in the mangrove sediments of Waiheru Village is 231.58 mg.m−2.h−1. The GWP contributed by the type of sandy silt sediment was 140.72 CO2-eq mg.m−2.h−1, muddy sand was 70.95 mg.m−2.h−1, and sand sediment was 19.91 CO2-eq mg.m−2. h−1.

Potensi pemanasan global emisi gas nitrous oksida (N2O) pada kawasan mangrove Desa Poka, Kota Ambon

“…Salah satu wilayah yang merupakan habitat ekosistem mangrove adalah pesisir pantai Poka yang terletak di Teluk Ambon Dalam. Informasi mengenai emisi dan potensi pemanasan global dari gas N 2 O pada sedimen mangrove yang ada di pesisir TAD masih terbatas, diantaranya ekosistem mangrove di Desa Waiheru sebagaimana dilaporkan oleh Kesaulya et al (2023). Sementara itu, untuk Desa Poka belum pernah dilaporkan, sehingga menjadi topik yang menarik untuk diteliti agar dapat menghasilkan informasi dasar yang ilmiah terkait emisi dan potensi pemanasan global gas N 2 O yang dihasilkan dari degradasi bahan organik yang terjadi pada sedimen mangrove.…”

“…Pengambilan sampel gas dilakukan dengan meletakkan sungkup (Volume 17 L; Luas alas 0,0615 m 2 ) di bawah kanopi mangrove berdasarkan karakter substrat yaitu lumpur berpasir, pasir berlumpur, dan pasir (Kesaulya et al, 2023) (Gambar 2). Gas diambil melalui syiringe menggunakan spoit lalu dimasukkan dalam botol vial 10 ml.…”