2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

<< BACK TO AGENDA

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

Presentation:
This presentation has not yet been uploaded.

Handouts:
Handout is not Available

Transcripts:
CART transcripts are NOT YET available, but will be posted shortly after the conference


Presenters/Authors

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


ASHA DISCLOSURE:

Financial -

Nonfinancial -

Todd V. Royer (), Indiana University Bloomington, troyer@indiana.edu;


ASHA DISCLOSURE:

Financial -

Nonfinancial -

Jennifer L. Tank (), University of Notre Dame, tank.1@nd.edu;


ASHA DISCLOSURE:

Financial -

Nonfinancial -

Shannon Speir (), University of Notre Dame, sspeir@nd.edu;


ASHA DISCLOSURE:

Financial -

Nonfinancial -

Matt Trentman (), Flathead Lake Biological Station, University of Montana, matt.trentman@flbs.umt.edu;


ASHA DISCLOSURE:

Financial -

Nonfinancial -

Brittany Hanrahan (), USDA Agricultural Research Service, br.hanrahan@gmail.com;


ASHA DISCLOSURE:

Financial -

Nonfinancial -

Sheila Christopher (), University of Notre Dame, sheila.christopher@nd.edu;


ASHA DISCLOSURE:

Financial -

Nonfinancial -

Ursula H. Mahl (), University of Notre Dame, umahl@nd.edu;


ASHA DISCLOSURE:

Financial -

Nonfinancial -