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Grantee Research Project Results

Grantee Research Project Results

Nitrogen Leaching in Riparian Autumn-Olive Stands in Southern Illinois

EPA Grant Number: F5E61407
Title: Nitrogen Leaching in Riparian Autumn-Olive Stands in Southern Illinois
Investigators: Goldstein, Christine L.
Institution: Southern Illinois University - Carbondale
EPA Project Officer: Zambrana, Jose
Project Period: September 1, 2005 through August 1, 2007
Project Amount: $74,000
RFA: GRO Fellowships for Graduate Environmental Study (2005)
Research Category: Academic Fellowships

Description:

Objective:

Autumn-olive is a nitrogen fixing, invasive woody shrub that has become established in many pastures and old fields in the eastern United States.

To determine whether excess nitrogen (nitrate and ammonium) is leaching below riparian autumn-olive stands, potentially contributing to stream nitrogen loads.

Approach:

To achieve this objective, we installed six tension lysimeters in both autumn-olive and open field plots at three riparian sites in southern Illinois. Soil water samples were collected monthly and analyzed for dissolved nitrate, ammonium, pH, and specific conductivity. When graduate research commences in fall 2005, the soil water samples will be collected every two weeks. We will also be installing groundwater wells to determine if nitrate in soil water is leaching into the water table. We also plan to sample stream water from local headwater watersheds with varying percent coverage of autumn-olive to determine if there is a relationship between autumn-olive and stream nitrogen concentrations at the watershed scale.

Expected Results:

To date, soil water ammonium concentrations have been relatively low and were similar between autumn-olive and open field plots. Soil water nitrate concentrations were relatively high under autumn-olive stands and were significantly higher than open field plots. We expect similar results with future soil water and groundwater samples. We also expect to find higher nitrate levels in the streams with the higher percent autumn-olive cover.

Supplemental Keywords:

Autumn-olive, nitrate, invasive species, soil water, groundwater, water quality, tension lysimeters,, RFA, Scientific Discipline, Ecosystem Protection/Environmental Exposure & Risk, Monitoring/Modeling, Environmental Monitoring, Ecology and Ecosystems, aquatic ecosystem, watershed, tension lysimeters, groundwater, nitrogen

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The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.

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