Cold spots and cold moments: The potential for sediment freezing to depress denitrification in wetland sediments.
Journal
Journal of environmental quality
ISSN: 1537-2537
Titre abrégé: J Environ Qual
Pays: United States
ID NLM: 0330666
Informations de publication
Date de publication:
Sep 2022
Sep 2022
Historique:
received:
12
08
2021
accepted:
06
06
2022
pubmed:
13
7
2022
medline:
5
10
2022
entrez:
12
7
2022
Statut:
ppublish
Résumé
Within the north-temperate zone, winters can be long and are associated with conditions of low temperature and potential for sediment freezing. There are critical gaps in our knowledge of biogeochemical cycling during winter and inadequate knowledge of how warming winters and changing snowpack might affect biogeochemistry. Here, we assessed the impacts of sediment freeze-thaw cycling and nitrate amendment on denitrification rates in the littoral fringe of four urban wetlands. We demonstrate the potential for experimental sediment freezing to suppress denitrification, although freezing effects were not observed at all sites. Multiple freeze-thaw cycles were assessed, and, although subsequent cycles may affect denitrification, the first instance of our experimental freezing seems the most critical. Although this work demonstrates potential sensitivity of wetland denitrification rates to changing winter conditions, we note nitrate availability has a larger impact upon denitrification rates. This suggests nitrification rates and changing nitrate loads may be more important determinants of nitrate retention than sediment freeze-thaw history. Although there has been great interest in hot spots and moments for biogeochemical cycling, we suggest there is similar need to understand cold spots and moments, as evidenced here. This is particularly important where cold moments may correspond with critical periods of nitrate transport, such as snowmelt.
Substances chimiques
Nitrates
0
Nitrogen
N762921K75
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
990-1002Subventions
Organisme : Global Institute for Water Security, University of Saskatchewan
ID : DG 06556
Organisme : NSERC
Informations de copyright
© 2022 The Authors. Journal of Environmental Quality published by Wiley Periodicals LLC on behalf of American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.
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