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HERO ID
3549160
Reference Type
Journal Article
Title
Long-term fertilization alters the relative importance of nitrate reduction pathways in salt marsh sediments
Author(s)
Peng, X; Ji, Q; Angell, JH; Kearns, PJ; Yang, HJ; Bowen, JL; Ward, BB
Year
2016
Is Peer Reviewed?
No
Journal
Journal of Geophysical Research: Biogeosciences
ISSN:
2169-8953
EISSN:
2169-8961
Volume
121
Issue
8
Page Numbers
2082-2095
DOI
10.1002/2016JG003484
Web of Science Id
WOS:000385712400005
Abstract
Salt marshes provide numerous valuable ecological services.
In particular, nitrogen (N) removal in salt marsh sediments alleviates N loading to the coastal
ocean. N removal reduces the threat of eutrophication caused by increased N inputs from
anthropogenic sources. It is unclear, however, whether chronic nutrient overenrichment alters the
capacity of salt marshes to remove anthropogenic N. To assess the effect of nutrient enrichment
on N cycling in salt marsh sediments, we examined important N cycle pathways in experimental
fertilization plots in a New England salt marsh. We determined rates of nitrification,
denitrification, and dissimilatory nitrate reduction to ammonium (DNRA) using sediment slurry
incubations with N-15 labeled ammonium or nitrate tracers under oxic headspace (20% oxygen/80%
helium). Nitrification and denitrification rates were more than tenfold higher in fertilized
plots compared to control plots. By contrast, DNRA, which retains N in the system, was high in
control plots but not detected in fertilized plots. The relative contribution of DNRA to total
nitrate reduction largely depends on the carbon/nitrate ratio in the sediment. These results
suggest that long-term fertilization shifts N cycling in salt marsh sediments from predominantly
retention to removal.
Tags
IRIS
•
Nitrate/Nitrite
Broad LitSearch 2016/1/1 - 2017/12/5
Refs found by LitSearch but not ATSDR/IARC
WoS
Refs found only by 2017 LitSearch or Citation Mapping
Ref Types 12/2017
Non-Peer-Reviewed
NAAQS
•
ISA NOxSOxPM Ecology (2018)
Cited in the Second Draft
Appendix 11
•
ISA NOxSOxPM Ecology (2020- Final Project Page)
Cited
Appendix 11
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