Mitigating agricultural nitrogen load with constructed ponds in northern latitudes : A field study on sedimental denitrification rates

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http://hdl.handle.net/10138/313918

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Uusheimo , S A , Tulonen , T V , Aalto , S L & Arvola , L M J 2018 , ' Mitigating agricultural nitrogen load with constructed ponds in northern latitudes : A field study on sedimental denitrification rates ' , Agriculture, Ecosystems & Environment , vol. 261 , pp. 71-79 . https://doi.org/10.1016/j.agee.2018.04.002

Title: Mitigating agricultural nitrogen load with constructed ponds in northern latitudes : A field study on sedimental denitrification rates
Author: Uusheimo, Sari Anneli; Tulonen, Tiina Valpuri; Aalto, Sanni L.; Arvola, Lauri Matti Juhani
Contributor: University of Helsinki, Lammi Biological Station
University of Helsinki, Lammi Biological Station
University of Helsinki, University Management
Date: 2018-07-01
Language: eng
Number of pages: 9
Belongs to series: Agriculture, Ecosystems & Environment
ISSN: 0167-8809
URI: http://hdl.handle.net/10138/313918
Abstract: Constructed agricultural ponds and wetlands can reduce nitrogen loading from agriculture especially in areas where warm climate predominates. However, in cold climate temperature-dependency of microbiological processes have raised the question about the applicability of constructed wetlands in N removal. We measured in situ denitrification rates in a constructed agricultural pond using N-15-isotope pairing technique at ambient light and temperature throughout a year as well as diurnally. The field IPT measurements were combined with a wide set of potentially important explanatory data, including air temperature, photosynthetically active radiation, precipitation, discharge, nitrate plus other water quality variables, sediment temperature, oxygen concentration and penetration depth, diffusive oxygen uptake and sediment organic carbon. Denitrification varied, on average, diurnally between 12 and 314 mu mol N m(-2) h(-1) and seasonally between 0 and 12409 mu mol m(-2) h(-1). Light and oxygen regulated the diel variation of denitrification, but seasonally denitrification was governed by a combination of temperature, oxygen and turbidity. The results indicated that the real N removal rate might be 30-35% higher than the measured daytime rates, suggesting that neglecting the diel variation of denitrification we may underestimate N removal capacity of shallow sediments. We conclude, that by following recommended wetland:catchment - size ratios, boreal agricultural ponds can efficiently remove nitrogen by denitrification in summer and in autumn, while in winter and in spring the contribution of denitrification might be negligible relative to the loading, especially with short residence time.
Subject: 1172 Environmental sciences
4111 Agronomy
Denitrification
Agriculture
In situ
Sediment
Nitrate
Boreal
ORGANIC-MATTER
DIURNAL-VARIATION
MARINE-SEDIMENTS
NITRATE
OXYGEN
NITRIFICATION
WETLAND
WATERS
MICROELECTRODES
PHOTOSYNTHESIS
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