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Water 2013, 5(2), 327-341; doi:10.3390/w5020327
Review

Inorganic Nitrogen Deposition and Its Impacts on N:P-Ratios and Lake Productivity

Received: 21 February 2013; in revised form: 4 March 2013 / Accepted: 14 March 2013 / Published: 25 March 2013
(This article belongs to the Special Issue Inorganic Pollution of Water Environment)
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Abstract: The pronounced increase in the cycling and deposition of biologically reactive dissolved inorganic nitrogen (DIN) over large areas globally not only cause increased concentrations of DIN in surface waters, but it will also affect nutrient ratios in rivers, lakes and coastal areas. This review addresses the flux and fate of DIN, focusing NO3 in lakes of boreal and alpine catchments. Not only DIN-deposition, but also catchment properties strongly affect the concentrations of NO3 in lakes, as well as NO3:total P (TP) ratios. This ratio displays an extreme variability, and does also serve as an indicator of shift between N and P-limitation of aquatic autotrophs. A high share of forests and bogs in the catchment generally decreases NO3:total P ratios, while alpine and subalpine catchments with sparse vegetation cover may have high NO3:total P ratios, especially in regions with high DIN-deposition. Several empirical and experimental studies indicate a shift from an initial N to P-limitation, but for N-limited lakes, an increased growth of phytoplankton, periphytes and macrophytes may be accredited to elevated inputs of DIN. An intensified P-limitation may also be a consequence of elevated DIN-deposition. This P-limitation may again yield higher C:P-ratios in autotrophs with negative impacts on grazers and higher trophic levels.
Keywords: catchment; lakes; nitrogen deposition; nitrate; phosphorus; stoichiometry; productivity catchment; lakes; nitrogen deposition; nitrate; phosphorus; stoichiometry; productivity
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Hessen, D.O. Inorganic Nitrogen Deposition and Its Impacts on N:P-Ratios and Lake Productivity. Water 2013, 5, 327-341.

AMA Style

Hessen DO. Inorganic Nitrogen Deposition and Its Impacts on N:P-Ratios and Lake Productivity. Water. 2013; 5(2):327-341.

Chicago/Turabian Style

Hessen, Dag O. 2013. "Inorganic Nitrogen Deposition and Its Impacts on N:P-Ratios and Lake Productivity." Water 5, no. 2: 327-341.


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