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Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O

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Groundwater nitrate contamination: factors and indicators.

Katharina Wick¹, Christine Heumesser, Erwin Schmid

¹University of Vienna, Department of Economics, Hohenstaufengasse 9, 1010 Vienna, Austria.

Journal of Environmental Management

|August 22, 2012

Summary

Agricultural land use and environmental factors significantly impact groundwater nitrate levels. The Gross Nitrogen Balance effectively predicts contamination, especially when considering regional precipitation patterns.

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Area of Science:

Environmental Science
Agricultural Science
Hydrology

Background:

Groundwater nitrate contamination poses risks to ecosystems and human health.
Agri-environmental indicators are crucial for regulatory policy development and monitoring.

Purpose of the Study:

To identify key factors influencing groundwater nitrate contamination.
To evaluate the predictive capacity of the Gross Nitrogen Balance (GNB) as an agri-environmental indicator.

Main Methods:

Statistical analysis of data from approximately 1200 Austrian municipalities.
Regression analysis to assess the relationship between land use, environmental factors, GNB, and nitrate concentration.

Main Results:

Cropland percentage positively correlates with groundwater nitrate levels.
Higher temperatures and precipitation are associated with lower nitrate concentrations.
The Gross Nitrogen Balance is a significant predictor of groundwater nitrate contamination.
Predictive accuracy of GNB improves with the inclusion of average regional precipitation.

Conclusions:

Land use and environmental conditions are significant determinants of groundwater nitrate contamination.
The Gross Nitrogen Balance, particularly when adjusted for precipitation, serves as a valid agri-environmental indicator for predicting nitrate pollution.