Estimasi Simpanan Karbon Berdasarkan Biomassa Above Ground Mangrove di Desa Kaliwlingi, Brebes

Abstract

Desa Kaliwlingi, Kabupaten Brebes, Jawa Tengah, memiliki sabuk hijau mangrove di pesisirnya yang berperan penting dalam penyimpanan karbon biru. Penelitian ini bertujuan mengamati vegetasi mangrove yang ada di Desa Kaliwlingi, serta mengestimasi simpanan karbon dan biomassa above ground (BAG). Survei mangrove pada 50 plot berukuran 10 m x 10 m dilakukan pada Oktober–November 2023. Estimasi biomassa dan simpanan karbon menggunakan metode non destructive sampling (Dharmawan dan Siregar 2008; Dharmawan 2010; SNI 7724: 2011) yang didasari oleh data diameter at breast height (DBH). Hasil penelitian mendapati ada dua spesies mangrove di Desa Kaliwlingi, yaitu Rhizophora mucronata dan Avicennia marina dengan kerapatan sebesar 2.632 ind/ha untuk pohon dan 2.808 ind/ha untuk anakan. Total simpanan karbon pada mangrove dipengaruhi oleh biomassa above ground dan diameter tegakan (DBH). Simpanan karbon dan BAG mangrove terbesar terdapat pada kelas DBH 9,08–24,04 cm (295,86 ton C/ha dan 629,49 ton/ha), sedangkan yang terendah pada DBH 1,34–5,30 cm (26,10 ton C/ha dan 55,54 ton/ha). Potensi karbon mangrove Desa Kaliwlingi belum mempertimbagkan nilai simpanan di bawah substrat.

Kaliwlingi, a village in Brebes Regency of Central Java Province, features mangrove green belts along its coastline and of importance for blue carbon storage. The aim of this study was to conduct mangrove vegetation assessment at village scale, also to estimate above ground biomass (AGB) and carbon storage. Mangrove assessment was carried out in October–November 2023, to identify and measure diameter at breast height (DBH) at 50 plots, each with 10 m × 10 m quadrant. Biomass and carbon storage estimation was utilizing non-destructive methods by Dharmawan and Siregar 2008; Dharmawan 2010; and SNI 7724: 2011. Two mangrove species were observed in Kaliwlingi, namely Rhizophora mucronata and Avicennia marina, with density of 2.632 ind/ha for trees and 2.808 ind/ha for saplings. Carbon storage in mangroves is function of DBH and biomass. The highest stored carbon potential and biomass was observed for DBH range class of 9,08–24,04 cm (295.86 tons C/ha and 629.49 tons/ha), while the lowest at DBH 1,34–5,30 cm range (26,10 tons C/ha and 55,54 tons/ha). Blue carbon potential from mangroves at Kaliwlingi Village has yet to consider below ground carbon storage.