Kondisi Kesehatan Mangrove dan Stok Karbon Biomassa di Area Bontang Mangrove Park

Abstract

Kajian terkini mangrove di Mangrove Bontang Park terbatas pada kajian perubahan luasan area mangrove, namun belum menghitung nilai stok karbon. Penelitian ini bertujuan untuk mengetahui stok karbon yang tersimpan di biomassa mangrove di lokasi tersebut dan menganalisis hubungannya dengan sebaran tingkat kesehatan mangrove. Pengambilan data dilakukan di pada bulan Februari 2023. Sebaran zona penelitian berdasarkan model sebaran indeks kesehatan mangrove menggunakan data citra Sentinel-2A yang dibagi menjadi 3 zona yaitu Zona Excellent, Zona Moderate, dan Zona Poor. Data lapangan yang diambil antara lain jumlah tegakan, persentasi tutupan kanopi dan diameter batang pohon. Aplikasi MonMang 2.0 digunakan dalam mengukur tingkat kesehatan mangrove secara langsung di lapangan. Stok karbon pada biomassa mangrove dihitung menggunakan persamaan alometrik biomassa mangrove dan faktor konversi biomassa-karbon. Hasil validasi indeks kesehatan mangrove menggunakan MonMang 2.0 menunjukkan bahwa tingkat kesehatan mangrove di lokasi penelitian termasuk dalam kategori cukup baik. Stok karbon pada biomassa atas (AGB) diestimasi sebesar 180,74 MgC/ha dan stok karbon biomassa bawah memiliki rata-rata 102,29 MgC/ha dengan total 283,04 MgC/ha. Hasil analisis data menunjukkan tidak terdapat hubungan signigikan antara stok karbon pada biomassa mangrove dan indeks kesehatan mangrove.

The recent study of mangroves in Bontang Mangrove Park was limited in studying changes in mangrove area, but the carbon stocks were not quantify. This research aimed to estimate the carbon stock stored in mangrove biomass and to analyze its relationship with the mangrove health distribution in there. The distribution of research zones were based on the mangrove health index distribution model by using Sentinel-2A image data. The model result divided into 3 zones that were Excellent Zone, Moderate Zone and Poor Zone. Field data collection was done in February 2023. Data collection included the number of stands, canopy cover and diameter at breast height. The MonMang 2.0 application was used to measure the health level of mangroves, directly in the field. Carbon stock in mangrove biomass was calculated by using the mangrove biomass allometric equation and the biomass-carbon conversion factor. The validation results of the mangrove health index using MonMang 2.0 showed that the level of mangrove health at the research location was moderate. Carbon stock in above-ground biomass (AGB) estimated at 180.74 MgC/ha and below-ground biomass was 102.29 MgC/ha with a total carbon stock was at 283.04 MgC/ha. No significant relationship was found between carbon stocks in mangrove biomass and the mangrove health index.