en Ecology Ecology پژوهشي Orginal research papers The mangrove forest ecosystem is known to possess a variety of ecosystem services, including high rates of carbon sequestration, storage and mitigating climate change through reduced deforestation. This study was carried out in the mangrove forests of Gowatr Bay, Gulf of Oman during 2017-18 to quantify biomass and carbon stocks of all components of this forest, including live and dead trees, soil, pneumatophores, herbaceous and litter in three stations during post-monsoon and pre-monsoon. We examined that biomass, carbon stocks and soil carbon varied significantly with spatial locations (<em>p</em><0.05) abut not with seasons (<em>p</em>>0.05). The mean of biomass and carbon stock were estimated 125.54&plusmn;19.31 and 129.21&plusmn;19.64 Mg ha^-1, and 48.48&plusmn;7.51 and 49.9&plusmn;7.5 Mg ha^-1, in post-monsoon and pre-monsoon, respectively. Also, Soil carbon was determined 227.1&plusmn;11.86 and 227.3&plusmn;11.71 Mg ha^-1in post-monsoon and pre-monsoon, respectively. A positive correlation was found between the vegetation biomass and soil organic carbon in post-monsoon (r=0.905) and pre-monsoon (r=0.914), indicating the role of vegetation in building soil organic carbon. The mean carbon stock value for the total area of mangroves in post-monsoon and pre-monsoon was extrapolated as 43.9 and 44.2 Kt of C, equivalent to 161.13 and 162.102 Kt of CO2, respectively. This data reveals that Gowatr mangroves store a substantial amount of atmospheric carbon, and therefore need to be conserved and sustainably managed to maintain as well as to increase carbon storage. Avicennia marina, Mangrove ecosystem, Sistan and Baluchestan province, Spatial and temporal variation. 1657 1680 http://jifro.ir/browse.php?a_code=A-10-3619-1&slc_lang=en&sid=1 A. Savari 100319475328460037285 100319475328460037285 No Faculty of Marine Science and Oceanography,khorramshahr university of Marine Science and TechnologyKhorramshahr, Iran M. Khaleghi matinkhaleghi@yahoo.com 100319475328460037286 100319475328460037286 Yes Faculty of Marine Biology,Chabahar University of Maritime and Marine Sciences, Chabahar, Iran A.R. Safahieh 100319475328460037287 100319475328460037287 No Faculty of Marine Science and Oceanography,khorramshahr university of Marine Science and TechnologyKhorramshahr, Iran M. Hamidian Pour 100319475328460037288 100319475328460037288 No Faculty of Geography and Environmental Planning,University of Sistan and Baluchestan, Zahedan, Iran S. Ghaemmaghami 100319475328460037289 100319475328460037289 No Faculty of Marine Science and Oceanography,khorramshahr university of Marine Science and TechnologyKhorramshahr, Iran