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
[Journal article]
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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 | ||||||
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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: |
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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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