IMPACT OF FORESTRY PRACTICES ON METHANE AND CARBON DIOXIDE EMISSIONS ALONG A FOREST TO WETLAND GRADIENT

After carbon dioxide (CO₂), methane (CH₄) is the most important greenhouse gas contributing to human-induced climate change due to its ability to trap solar radiation 25 times more efficiently than CO₂. Wetlands are the largest natural source emitting CH_4, resulting from the combination of accumulated soil organic matter and extended periods of inundation. This leads to prolonged reducing conditions and favors anaerobic conditions, which are ideal in supporting methanogenic activity. The purpose of this research project is to investigate the impact of forestry practices on CH₄ and CO₂ emissions associated with microtopographic variation along a forest to wetland gradient in a managed forest on the coastal plain of South Carolina. Monthly measurements of CH₄ and CO₂ are being collected along three forest to wetland transects. The upslope loblolly pine, (Pinus taeda) overstory of two transects have been clear cut or thinned while a third transect serves as a reference. Water levels, soil moisture, temperature, and soil redox conditions are measured continuously along each transect. Here we present initial results from our sampling campaign.