To　improve　our　understanding　of　the　carbon　cycling　response　to　imminent　sea-level　rise　and　saltwater　intrusions,　we　review　the　existing　literature　on　the　likely　effects　of　the　increasing　salinity　and　inundation　on　organic　carbon　mineralization　in　tidal　wetlands.　Enhanced　salinity　and　inundation　will　reduce　the　pool　of　the　organic　carbon　substrate,　but　may　expand　that　of　microbes　with　strong　capacities　for　carbon　metabolism.　Sulfate　availability　increases　with　the　increasing　salinity,　while　availability　of　other　electron　acceptors,　e.g.,　oxygen,　nitrate,　ferric　oxides,　and　carbon　dioxide,　could　transiently　increase　but　would　ultimately　fall　with　the　increasing　salinity　and　inundation.　The　changing　electron　acceptor　pattern　may　result　in　microbial　sulfate　reduction　predominating　over　other　carbon　mineralization　pathways.　Data　derived　from　natural　salinity　and　inundation　gradients　suggest　clear　negative　effects　of　salinity　and　inundation　on　production　rates　or　emission　fluxes　of　carbon　dioxide　and　methane.　However,　results　for　brackish　wetlands　are　conflicting,　probably　due　to　their　unique　geographic　location.　Salinity　and　inundation　exert　their　influence　on　organic　carbon　mineralization　through　sulfate　enrichment,　elevating　ionic　and　osmotic　stress　and　decreasing　oxygen　concentrations　and　redox　conditions,　among　other　biogeochemical　changes.　Future　studies　should　address　the　combined　effects　of　salinity　and　inundation　on　carbon　biogeochemistry　in　low-level　salinity　tidal　wetlands.　©　2017,　Springer　International　Publishing　AG.