Recent　advancements　in　landfill　designs　integrate　vegetated　covers　as　a　sustainable　layer　to　mitigate　methane　emissions.　In　this　study,　we　developed　a　comprehensive　analytical　model　incorporating　diffusion,　advection,　oxidation,　and　root　effects　on　methane　and　oxygen　transport　through　landfill　green　covers.　Root　characteristics,　including　architecture,　gas　conductivity,　depth,　and　density,　were　found　to　be　influential　parameters　on　methane　oxidation　and　emission　in　vegetated　covers.　For　example,　at　0.4-m　root　depth,　exponential　versus　uniform　root　distribution　yields　a　0.1221　difference　in　methane　concentration　for　a　root　density　of　105　m=m3.　Roots　with　3　×　10−5　m　air=m　root　gas　conductivity　achieved　13.3%　methane　oxidation　efficiency.　Increasing　root　depth　and　density　extended　the　aerobic　zone,　but　CH4　oxidation　efficiency　declined　beyond　the　root　density　of　104　m=m3.　We　showed　that　vegetation　cover　elevates　methane　emission　control,　potentially　meeting　emission　standards　[e.g.,　carbon　farming　initiative　(CFI)]　with　root　densities　exceeding　104　m=m3.　The　balance　between　atmospheric　oxygen　and　soil　methane　affects　oxidation,　with　higher　air　transport　(λ　¼　3　×　10−4　m　air=m　root)　resulting　in　1.8%　less　methane　oxidized.　Overall,　root–methane　dynamics　analysis　should　be　optimized　for　efficient　methane　mitigation　and　control　through　landfill　green　cover　systems.　©　2024　American　Society　of　Civil　Engineers.