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Denitrification rates in lake sediments of mountains affected by high atmospheric nitrogen deposition

Palacin-Lizarbe, Carlos and Camarero, Lluis and Hallin, Sara and Jones, Christopher and Catalan, Jordi (2020). Denitrification rates in lake sediments of mountains affected by high atmospheric nitrogen deposition. Scientific Reports. 10 , 3003 , 1-9
[Journal article]

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Abstract

During the last decades, atmospheric nitrogen loading in mountain ranges of the Northern Hemisphere has increased substantially, resulting in high nitrate concentrations in many lakes. Yet, how increased nitrogen has affected denitrification, a key process for nitrogen removal, is poorly understood. We measured actual and potential (nitrate and carbon amended) denitrification rates in sediments of several lake types and habitats in the Pyrenees during the ice-free season. Actual denitrification rates ranged from 0 to 9 mu mol N2O m(-2) h(-1) (mean, 1.5 +/- 1.6 SD), whereas potential rates were about 10times higher. The highest actual rates occurred in warmer sediments with more nitrate available in the overlying water. Consequently, littoral habitats showed, on average, 3-fold higher rates than the deep zone. The highest denitrification potentials were found in more productive lakes located at relatively low altitude and small catchments, with warmer sediments, high relative abundance of denitrification nitrite reductase genes, and sulphate-rich waters. We conclude that increased nitrogen deposition has resulted in elevated denitrification rates, but not sufficiently to compensate for the atmospheric nitrogen loading in most of the highly oligotrophic lakes. However, there is potential for high rates, especially in the more productive lakes and landscape features largely govern this.

Authors/Creators:Palacin-Lizarbe, Carlos and Camarero, Lluis and Hallin, Sara and Jones, Christopher and Catalan, Jordi
Title:Denitrification rates in lake sediments of mountains affected by high atmospheric nitrogen deposition
Year of publishing :2020
Volume:10
Article number:3003
Number of Pages:9
Publisher:Springer Nature
ISSN:2045-2322
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:Reactive nitrogen, Earth-system processes, freshwater ecosystems, mountain lakes
URN:NBN:urn:nbn:se:slu:epsilon-p-106437
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-106437
Additional ID:
Type of IDID
DOI10.1038/s41598-020-59759-w
Web of Science (WoS)000534372400001
ID Code:17175
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Forest Mycology and Plant Pathology
(S) > Dept. of Forest Mycology and Plant Pathology
Deposited By: SLUpub Connector
Deposited On:07 Jul 2020 08:40
Metadata Last Modified:16 Aug 2020 18:13

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