Carbono "azul" nos manguezais amazônicos conservação e valoração econômica

Mangroves and their associated soils could sequester about 22.8 million tonnes of carbon per year. Blue carbon refers to the carbon sequestered and stored by coastal and marine vegetated ecosystems. Despite the recognized importance of mangroves, they are still vulnerable and threatened due to loss and fragmentation of vegetation cover and reduced quality of aquatic habitats. The present study selected the Island of Ajuruteua, located in the city of Bragança/PA to estimate the aboveground biomass and carbon by applying NDVI (Normalized Difference Vegetation Index). The methodology consisted of the calculation of NDVI values from the Landsat images of 2008 and 2018 to estimate the values of biomass and carbon. The results for the year 2008 were approximately 451 Mg.ha-1 (Biomass) and 196 Mg.ha-1 (Carbon), for the year 2018 were 290 Mg.ha-1 (Biomass) and 125 Mg.ha-1 (Carbon). The obtained results pointed out a reduction of approximately 35.7% in biomass values and 36.2% in carbon values between 2008 and 2018. A probable cause of this reduction is attributed to the dynamics of the occupation of the island, which led to the reduction of vegetation cover.