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The Influence of Drainage on Biogeochemical Cycling of Carbon in Agricultural Ecosystems

The long term objective of this project is to understand and   quantify how artificial drainage influences environmental quality   and the biogeochemical cycling of carbon, nitrogen, and phosphorus,   which are increasingly impacted by human activities.     Two other objectives:  1) Determine the effect of depth and spacing of subsurface tile   drainage in agricultural ecosystems on the magnitude of dissolved   organic carbon export. Our working hypothesis is that increased tile   drainage intensity will increase dissolved organic carbon fluxes   mainly through control of water discharge.  2) Determine the influence of subsurface tile drainage systems on   qualitative characteristics of dissolved organic matter that will,   in turn, affect the fate of DOM. Our working hypothesis is that DOM   exported from systems with deeper drainage will exhibit lower   molecular weight than drainage which followed a shallower flow path.   We also expect that DOM in drainage will become less bioavailable   with increasing contact time with mineral soil (e.g., deeper   drainage).    Results of this research will enable researchers to identify how   agricultural drainage influences the quantity and quality of   dissolved organic matter export. Knowledge of how subsurface tile   drainage systems influence the export of dissolved organic matter is   critical for understanding the role that agricultural ecosystems   play in biogeochemical carbon cycling in agricultural landscapes.   This knowledge of carbon cycling dynamics is also essential for   understanding the movement of nitrogen across the landscape, due to   the tight coupling of carbon and nitrogen cycling.    (phosphorous); (nitrogen); (cycling); (phosphorous cycling);   (nitrogen cycling); (carbon); (carbon cycling); (land use)

Status
In progress
Type
Project
Start Date
End Date
Scope of Study
Field Investigation
Scale of Phenomena
Landscape
Physical/Chemical
Impact of Pollutants
Nutrients, Including Phosphorus
Processes
Treatment / Manufacturing Processes
State Province
Minnesota
Annex Numbers
Control of Phosphorus
Pollution from Contaminated Groundwater
Research & Development
Annex 17
Physical and transformational processes affecting delivery of pollutants
General
Annex
  • Annex Numbers
    Annex Numbers
    Control of Phosphorus
    Pollution from Contaminated Groundwater
    Research & Development
  • Annex 17
    Annex 17
    Physical and transformational processes affecting delivery of pollutants

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