CARBON STOCK CHANGES IN MANGROVE OVER PERIODS IN QUANG YEN TOWN, QUANG NINH PROVINCE

Mangrove forests are often located in estuaries and tropical and subtropical coastal areas, where the tides come in and out every day. Mangroves play a significant role in human life in these areas. The study used PlanetScope images in 2017, 2020 and 2023 combined with the NDVI index to build the maps of mangrove area and determine biomass and carbon stocks for Quang Yen town. The results showed that the area of mangrove forests in Quang Yen town acconted for 3470.026, 3358.81 and 3418.10 ha in 2017, 2020, and 2023, respectively. The accuracy of the mangrove forest map between the years was 88 %, 88 % and 88 %, respectively. The total aboveground biomass (AGB) reserves acconted for 18,302,976 t (tonnes), 94,104,161 t and 145,035,226 t. The total bove ground carbon stock (AGC) was 8,693,913 t, 44,699,477 t and 68,891,730 t for 2017, 2020 and 2023. The use of remote sensing technology to build carbon stock maps for mangrove forests in Quang Yen town can be applied to other provinces. These findings are essential for sustainable mangrove management in the study area and finding suitable solutions. Blue Carbon and Payment for Ecosystem Services are effective solutions that can be applied here to minimise risks and enhance the effectiveness of mangrove forests in the future.