Model Distribusi Spasial Kehilangan Biomassa Akibat Perambahan Mangrove di Desa Lubuk Kertang, Kecamatan Brandan Barat, Kabupaten Langkat

Abstract

Mangrove forests are a group of tropical coastal vegetation that generally grows on muddy soil in coastal areas or at river estuaries that are influenced by tides. Biomass loss in the mangrove area in Lubuk Kertang Village certainly has a negative impact on the environment. Loss of mangrove biomass can reduce the climate change mitigation function which is a large carbon source and result in CO2 emissions. This research aims to build a spatial model for the distribution of biomass loss due to encroachment using Sentinel-2A imagery in the mangrove forest of Lubuk Kertang Village, Brandan District, Langkat Regency. The data collection method in the field was carried out by purposive sampling of 75 observation plots. Measurement of biomass loss uses the allometric equation. Making a spatial model using selected vegetation indices, namely NDVI. The results of this research use the NDVI linear model with the regression equation y = -264.3x + 262.82, which has an R² value = 0.714, paired t-test > 0.05 and RMSE = 9.38. The results of measuring the average biomass loss in the field were: 101.81 tons/ha.