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Nitrogen removal in...
Nitrogen removal in marine environments: recent findings and future research challenges
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- Hulth, Stefan, 1965 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för kemi,Department of Chemistry,University of Gothenburg
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Aller, R. C (author)
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Canfield, D. E (author)
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Dalsgaard, T (author)
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- Engström, Pia, 1970 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för kemi,Department of Chemistry,University of Gothenburg
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Gilbert, F. (author)
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- Sundbäck, Kristina, 1949 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för marin ekologi,Department of Marine Ecology,University of Gothenburg
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Thamdrup, B (author)
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(creator_code:org_t)
- Elsevier BV, 2005
- 2005
- English.
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In: Marine Chemistry. - : Elsevier BV. - 0304-4203. ; 94:1-4, s. 125-145
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Abstract
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- Respiratory reduction of nitrate (denitrification) is recognized as the most important process converting biologically available (fixed) nitrogen to N-2. In current N cycle models, a major proportion of global marine denitrification (50-70%) is assumed to take place on the sea floor, particularly in organic rich continental margin sediments. Recent observations indicate that present conceptual views of denitrification and pathways of nitrate reduction and N, formation are incomplete. Alternative N cycle pathways, particularly in sediments. include anaerobic ammonium oxidation to nitrite, nitrate and N-2 by Mn-oxides, and anaerobic ammonium oxidation coupled to nitrite reduction and subsequent N, mobilization. The discovery of new links and feedback mechanisms between the redox cycles of, e.g., C, N, S, Mn and Fe casts doubt on the present general understanding of the global N cycle. Recent models of the oceanic N budget indicate that total inputs are significantly smaller than estimated fixed N removal. The occurrence of alternative N reaction pathways further exacerbates the apparent imbalance as they introduce additional routes of N removal. In this contribution, we give a brief historical background of the conceptual understanding of N cycling in marine ecosystems, emphasizing pathways of aerobic and anaerobic N mineralization in marine sediments, and the implications of recently recognized metabolic pathways for N removal in marine environments. (c) 2004 Elsevier B.V. All rights reserved.
Subject headings
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Keyword
- nitrogen
- removal
- marine
- ANAEROBIC AMMONIUM OXIDATION
- EARTHS EARLY ATMOSPHERE
- ORGANIC-MATTER
- MINERALIZATION
- PROTEROZOIC OCEAN CHEMISTRY
- EARLY DIAGENETIC
- PROCESSES
- NITRATE-REDUCING BACTERIA
- OXIC-ANOXIC INTERFACE
- BIOGEOCHEMICAL CYCLES
- ESTUARINE SEDIMENT
- FERROUS IRON
- FERROUS IRON
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Hulth, Stefan, 1 ...
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Aller, R. C
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Canfield, D. E
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Dalsgaard, T
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Engström, Pia, 1 ...
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Gilbert, F.
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show more...
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Sundbäck, Kristi ...
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Thamdrup, B
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Biological Scien ...
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and Ecology
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
- Articles in the publication
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Marine Chemistry
- By the university
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University of Gothenburg
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Chalmers University of Technology