2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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6/08/2017 | 9:45 AM - 10:00 AM | IN-STREAM CARBON CYCLE IMPACTS FROM WATERSHED-SCALE IMPLEMENTATION OF WINTER COVER CROPS: DOC AND GREENHOUSE GAS DYNAMICS | 306A

IN-STREAM CARBON CYCLE IMPACTS FROM WATERSHED-SCALE IMPLEMENTATION OF WINTER COVER CROPS: DOC AND GREENHOUSE GAS DYNAMICS

Dissolved organic carbon (DOC) plays a role in many biogeochemical processes, including greenhouse gas production. Agricultural land use can impact stream DOC through tillage, cropping, and subsurface tile drainage. Conservation practices, such as winter cover crops, can mitigate agricultural impacts on streams, but watershed-scale impacts on DOC dynamics remain understudied. We analyzed bi-weekly DOC samples from two tile-drained agricultural watersheds beginning in June 2015: one with 70% of croppable acres in winter cover crops, and one with 20%. We also collected monthly dissolved carbon dioxide, methane, and nitrous oxide samples from tile drains and streams in the minimally cover-cropped watershed. DOC concentrations varied seasonally, and across the two watersheds and stream concentrations were higher than tile drain water (3 mg/L and 1.5 mg/L, respectively). Streams were typically super-saturated in all three gases, and for carbon dioxide and methane, stream concentrations were several fold higher than in tile water. The relationships between DOC and greenhouse gases will enhance our understanding of the carbon cycle in agroecosystems, with potentially important implications for biogeochemical processes and water quality in these intensively-managed landscapes.

C10 Biogeochemistry
C31 Organic Matter Processing
C27 Landuse and Non-Point source Impacts

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Presenters/Authors

Kara Prior (), Indiana University, kprior@indiana.edu;