To better understand the mechanisms that contribute to soil-derived CH4 being emitted through tree stems in wetland ecosystems, we will build upon existing measurements made by the Matthes Lab and colleagues. CH4 fluxes from soils and tree stems have been consistently measured in the Black Gum Swamp for more than a year, and porewater CH4 depth profiles have also been develop. To better understand the processes that govern the tree-mediated transport of CH4, we will explore the diffusive and advective aspects of the root-soil interface, investigating the role that root systems play in the uptake and subsequent axial transport of CH4 through tree stems. Using co-located root and peat cores near instrumented trees and traced fine roots, we aim to measure and model the mechanisms contributing to tree stem fluxes to constrain uncertainty in specific plant-mediated transport mechanisms and improving gas flux models.