Mangrove merupakan ekosistem pesisir yang memiliki kemampuan sangat baik dalam menyerap dan menyimpan karbon. Struktur tegakan mangrove memberikan kontribusi signifikan terhadap estimasi simpanan karbon yang umumnya tergambarkan pada persamaan alometrik dalam skala individu. Penelitian simpanan karbon atas permukaan tanah (abovegroundada komunitas mangrove telah dilakukan di mangrove Teluk Benoa. Penelitian ini bertujuan untuk membangun model dalam mengestimasi simpanan karbon aboveground dari beberapa parameter struktur tegakan mangrove. Metode stratified purposive sampling digunakan dalam penentuan sebaran titik penelitian. Sebanyak tiga zona (1–3) diidentifikasi berdasarkan interpretasi analisis mRE-SR (modified red edge-simple ratio) dan jenis mangrove yang mendominasi. Estimasi simpanan karbon aboveground diperoleh dengan metode non-destructive menggunakan persamaan common allometric. Hasil penelitian menunjukkan struktur tegakan mangrove zona 1 cenderung berbeda signifikan dengan zona lainnya. Secara keseluruhan, rata-rata simpanan karbon aboveground sebesar 193,45±34,88 ton C/ha. Simpanan karbon aboveground tertinggi ditemukan pada zona 1 yang didominasi jenis Sonneratia alba. Analisis regresi linear dan Akaike’s Information Criterion (AIC) menunjukkan bahwa kombinasi dari tutupan kanopi, kerapatan pohon, kerapatan pancang dan diameter pohon menjadi model terbaik dalam mengestimasi simpanan karbon pada skala komunitas. Model kombinasi ini memiliki nilai koefisien regresi tertinggi dan nilai root mean squared error (RMSE) terendah dibandingkan dengan model lainnya. Hasil penelitian diharapkan dapat digunakan dalam mengestimasi simpanan karbon secara lebih efisien dan akurat dalam skala komunitas.
Beside their role as carbon sinker, mangrove soil can also emit greenhouse gases (GHG) through microbial metabolism. However, their emission was scarce in every mangrove zone. We measured the CO2 and N2O concentrations in Ngurah Rai Grand Forest Park, Bali, which experienced anthropogenic pressure. Rhizophora mucronata and Sonneratia alba dominated the mangrove vegetation in this area and have a characteristic zonation across the intertidal (landwards, middle, and seaward zone). Gas samples were taken above a height of 25 cm from mangrove soil during the wet season of 2020 at the three mangrove zones within three sites. Gas concentrations ranged from 303.09 – 330.57 ppm for CO2 and 0.51 – 0.53 ppm for N2O. CO2 and N2O concentrations were similar across mangrove zones, with a decreasing trend from the land toward the sea. A high density of mangrove trees was negatively associated with N2O; meanwhile, no soil and porewater parameters were significantly correlated with the gas concentrations. The result revealed that N2O concentration had exceeded the average value of the earth’s atmospheric N2O concentration. This information is essential for complementing previous research variations on GHG emissions and helps support the inventory of GHG emissions from the forestry sector.
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