Effect of ebullition and groundwater temperature on estimated dinitrogen excess in contrasting agricultural environments

The Science of the Total Environment
Micòl MastrociccoGiuseppe Castaldelli

Abstract

Denitrification is a key microbial-mediated reaction buffering the impact of agriculturally-derived nitrate loads. Groundwater denitrification capacity is often assessed by measuring the magnitude and patterns of dinitrogen excess, although this method can be biased by dissolved gasses exsolution and ebullition. To address this issue, shallow groundwater was sampled in two field sites via nested mini-wells on a monthly basis over an entire hydrological year and analysed for dissolved gasses, nitrate and physical parameters. Both sites are located in lowland areas of the Po River basin (Italy) and are characterized by intensive agriculture. The GUA site, a freshwater paleo-river environment, with a low content of organic matter (SOM) and oxic sub-oxic groundwater. The BAN site, a reclaimed brackish swamp environment, with abundant SOM and sulphidic-methanogenic groundwater. Groundwater samples evidenced a general deficit of dinitrogen and Argon concentrations, because of ebullition induced by a total dissolved gasses pressure exceeding the hydrostatic pressure. Ebullition was recorded only during winter at the reclaimed brackish soil and was triggered by methane exsolution. While in summer both sites were affected by ebullition ...Continue Reading

References

Sep 27, 2006·Environmental Science & Technology·Richard T Amos, K Ulrich Mayer
Aug 30, 2008·Water Research·Michael O RivettChrystina D Bemment
Sep 9, 2009·Ground Water·Bradley D CeyBridget R Scanlon
Jan 21, 2015·Journal of Environmental Quality·Todd R AndersonM Todd Walter
Sep 17, 2017·Environmental Pollution·Micòl MastrociccoGiuseppe Castaldelli
Dec 22, 2017·Environmental Microbiology·Shuaimin ChenBinbin Liu

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