Purpose　Increasing　evidence　indicates　that　trees　could　emit　methane　(CH4)　from　soils　into　the　atmosphere.　However,　inter-species　and　seasonal　variations　in　the　magnitude　of　tree-mediated　CH4　fluxes　within　coastal　mangrove　wetlands　have　not　yet　been　clarified.　Methods　We　measured　CH4　emission　fluxes　in　three　independent　mangrove　communities,　Avicennia　marina,　Aegiceras　corniculatum,　and　Kandelia　obovata,　within　a　subtropical　mangrove　wetland　during　tree　dormancy　and　growth　seasons　using　static　chambers.　Tree-stem,　pneumatophore,　and　soil-atmosphere-interface　CH4　fluxes　were　simultaneously　measured,　thus　enabling　an　estimate　of　the　contributions　from　each　pathway　to　ecosystem　CH4　fluxes.　Results　Pneumatophore　and　tree-stem　CH4　fluxes　were　much　higher　than　the　soil-atmosphere-interface　CH4　flux.　In　mangrove　communities　with　pneumatophores　(A.　marina),　the　pneumatophore　CH4　fluxes　accounted　for　84%　of　the　ecosystem　CH4　flux,　whereas　tree-stem　and　soil-atmosphere-interface　CH4　fluxes　accounted　for　9%　and　7%,　respectively.　In　contrast,　in　mangrove　communities　without　pneumatophores　(A.　corniculatum　and　K.　obovata),　the　tree-stem　CH4　fluxes　dominated　(75-79%)　the　ecosystem　CH4　fluxes,　whereas　the　soil-atmosphere-interface　CH4　fluxes　accounted　for　21-25%.　Ecosystem　CH4　fluxes,　as　well　as　pneumatophore,　tree-stem,　and　soil-atmosphere-interface　CH4　fluxes　were　higher　during　the　growth　season　than　the　dormancy　season.　However,　the　partitioning　of　ecosystem　CH4　fluxes　did　not　significantly　change　between　the　two　seasons.　Conclusion　Tree　stems　and　pneumatophores　are　important　conduits　for　CH4　emissions　in　mangrove　wetlands.　Ecosystem　CH4　emissions　may　offset　53%　(with　pneumatophores)　or　10-13%　(without　pneumatophores)　of　the　total　C　burial　rates　in　global　mangrove　wetlands.