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Coupling Soil Oxygen and Greenhouse Gas Dynamics

Dynamic soil hydrology triggers important shifts in soil biogeochemical and physical processes that control greenhouse gas (GHG) emissions. Soil oxygen (O 2 ), a direct control on biogenic GHG production (e.g. nitrous oxide-N 2 O, carbon dioxide-CO 2 and methane-CH 4 ), may serve as both an important proxy for determining sudden shifts in subsurface biogenic GHG production as well as the physical transport of soil GHG to the atmosphere. Recent technological advancements offer opportunities to link in-situ , near-continuous measurements of soil O 2 concentration to soil biogeochemical processes and soil gas transport. Using high frequency data, this study asked: Do soil O 2 dynamics correspond to soil GHG concentration and GHG surface flux? Change in subsurface CO 2 and N 2 O concentrations were inversely related to short-term (< 48 hrs) change in soil O 2 concentration at 10 and 20 cm whereas CH 4 concentrations did not change in response to soil O 2 dynamics. Although soil O 2 dynamics at 10 cm did not correspond with change in surface N 2 O and CH 4 flux, change soil O 2 concentration at 10 cm had a significant positive linear relationship with change in surface CO 2 flux. Our study suggests that coupling near-continuous soil O 2 concentration and soil gas flux under dynamic soil hydrology may lead to greater understanding of climate change feedbacks and serve as a relevant predictive tool for future climate change mitigation.