Journal
SOIL BIOLOGY & BIOCHEMISTRY
Volume 95, Issue -, Pages 164-172Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2015.12.018
Keywords
Soil oxygen dynamics; Soil moisture; Greenhouse gases; Biogeochemical processes; Soil gas transport
Categories
Funding
- NASA/USDA joint program on Carbon Cycle Science [2011-03007, 2011-00829]
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Hot spots and hot moments of greenhouse gas (GHG) fluxes can contribute significantly to overall GHG budgets. Hot spots and hot moments occur when dynamic soil hydrology triggers important shifts in soil biogeochemical and physical processes that control GHG emissions. Soil oxygen (O-2), a direct control on biogenic GHG production (i.e., nitrous oxide-N2O, carbon dioxide-CO2 and methane-CH4), 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 following short-term (<8 days) soil saturation correspond to changes in soil GHG concentrations and GHG surface fluxes? We addressed this question in a restored riparian wetland in Ohio, USA. Changes in subsurface (10 and 20 cm) CO2 and N2O concentrations were inversely related to short-term (<48 h) changes in soil O-2 concentrations. Subsurface CH4 concentrations, however, did not change in response to soil O-2 dynamics. Changing subsurface GHG concentrations did not necessarily translate into altered surface (soil to atmosphere) GHG fluxes; soil O-2 dynamics at 10 cm did not correspond with changes in surface N2O and CH4 fluxes. However, changes in soil O-2 concentration at 10 cm had a significant positive linear relationship with change in surface CO2 flux. Our study suggests that monitoring near-continuous soil O-2 concentration under dynamic soil hydrology may lead to greater understanding of hot spots and hot moments of GHG emissions. This understanding is increasingly important for estimating the contribution of soil processes to atmospheric GHG concentrations. (C) 2016 Elsevier Ltd. All rights reserved.
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