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LANDSCAPE INFLUENCES ON NON-POINT SOURCED NUTRIENTS FOR AGRICULTURAL WATERSHEDS IN OHIO
Citation:
Daniel, F B. LANDSCAPE INFLUENCES ON NON-POINT SOURCED NUTRIENTS FOR AGRICULTURAL WATERSHEDS IN OHIO. Presented at 12th National Nonpoint Source Monitoring Workshop, Ocean City, MD, September 26-30, 2004.
Impact/Purpose:
The purpose of this research project is to provide methods, tools and guidance to Regions, States and Tribes to support the TMDL program. This research will investigate new measurement methods and models to link stressors to biological responses and will use existing data and knowledge to develop strategies to determine the causes of biological impairment in rivers and streams. Research will be performed across multiple spatial scales, site, subwatershed, watershed, basin, ecoregion and regional/state.
Description:
In stream nutrient concentrations for a set of 35 small agricultural subwatersheds in southwestern Ohio have been monitored with respect to both water quality and biological integrity measures over a five year period. The dominant land cover in all of these subwatersheds is row crop agriculture. However, approximately one half (19) of the subwatersheds are located in relatively low clay-contented soils derived from glacial tills whereas the remainder (16) are located in a landscape dominated by older soils with a significantly higher clay content, greater erodibility, and lower permeability. The observed in-stream nutrient concentrations in these streams can be explained in terms of a set of landscape measures, of both anthropogenic and geophysical, in the surrounding catchments. These studies indicate the various classes of landscape measures interact to control the export of nutrients from agricultural land.