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Managing denitrification in human-dominated landscapes

Abstract
Increases in food supply and fossil fuel consumption are among the hallmarks of the 20th century. These changes share a common characteristic – they both contribute to an excess supply of plant-available (i.e., reactive) nitrogen – with negative consequences to ecosystems and water supplies across the globe. While there are vast quantities of di-nitrogen gas (N₂) in the atmosphere, this form of N is unavailable (termed unreactive N) to the vast majority of biological life (Galloway et al., 2003). Globally, this unreactive N can be converted to reactive N by four major processes: N-fixing microorganisms (often in symbiotic association with plants, 140 TgNyear⁻¹), industrial fertilizer production (125 TgNyear⁻¹), fossil fuel combustion (25 TgNyear⁻¹), and lightning (5 TgNyear⁻¹) (Schlesinger, 2009). The benefits of increased food production by use of N inputs are clear. World economies also continue to rely on fossil fuels for transport and fertilizer production. As with many biogeochemical processes that are manipulated at global scales, increased N inputs has adverse and unintended consequences (Galloway et al., 2008).
Type
Journal Article
Type of thesis
Series
Citation
Schipper, L.A., Gold, A.J. & Davidson, E.A. (2010). Managing denitrification in human-dominated landscapes, Ecological Engineering, 36(11), 1503-1506.
Date
2010
Publisher
Elsevier
Degree
Supervisors
Rights