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Chronic Atmospheric Reactive Nitrogen Deposition Suppresses Biological Nitrogen Fixation in Peatlands

Drijfhout, Falko P. and Saiz, Ernesto and Sgouridis, Fotis and Peichl, Matthias and Nilsson, Mats and Ullah, Sami (2021). Chronic Atmospheric Reactive Nitrogen Deposition Suppresses Biological Nitrogen Fixation in Peatlands. Environmental Science and Technology. 55 , 1310-1318
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Abstract

Biological nitrogen fixation (BNF) represents the natural pathway by which mosses meet their demands for bioavailable/reactive nitrogen (Nr) in peatlands. However, following intensification of nitrogen fertilizer and fossil fuel use, atmospheric Nr deposition has increased exposing peatlands to Nr loading often above the ecological threshold. As BNF is energy intensive, therefore, it is unclear whether BNF shuts down when Nr availability is no longer a rarity. We studied the response of BNF under a gradient of Nr deposition extending over decades in three peatlands in the U.K., and at a background deposition peatland in Sweden. Experimental nitrogen fertilization plots in the Swedish site were also evaluated for BNF activity. In situ BNF activity of peatlands receiving Nr deposition of 6, 17, and similar to 2 kg N ha(-1) yr(-1) was not shut down but rather suppressed by 54, 69, and 74%, respectively, compared to the rates under background Nr deposition of kg N ha(-1) yr(-1). These findings were corroborated by similar BNF suppression at the fertilization plots in Sweden. Therefore, contribution of BNF in peatlands exposed to chronic Nr deposition needs accounting when modeling peatland's nitrogen pools, given that nitrogen availability exerts a key control on the carbon capture of peatlands, globally.

Authors/Creators:Drijfhout, Falko P. and Saiz, Ernesto and Sgouridis, Fotis and Peichl, Matthias and Nilsson, Mats and Ullah, Sami
Title:Chronic Atmospheric Reactive Nitrogen Deposition Suppresses Biological Nitrogen Fixation in Peatlands
Series Name/Journal:Environmental Science and Technology
Year of publishing :2021
Volume:55
Page range:1310-1318
Number of Pages:9
Publisher:AMER CHEMICAL SOC
ISSN:0013-936X
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)
Keywords:N-15(2) assimilation method, biological nitrogen fixation, Sphagnum mosses, diazotrophs, Nr deposition, peatlands, nitrogen biogeochemistry
URN:NBN:urn:nbn:se:slu:epsilon-p-111193
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-111193
Additional ID:
Type of IDID
DOI10.1021/acs.est.0c04882
Web of Science (WoS)000612354700051
ID Code:22839
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Ecology and Management
Deposited By: SLUpub Connector
Deposited On:26 Mar 2021 08:23
Metadata Last Modified:26 Mar 2021 08:31

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