Denitrification in fringing salt marshes of Narragansett Bay, Rhode Island, USA

Autor: Barbara L. Nowicki, Cathleen Wigand, Jenny L. Davis
Rok vydání: 2004
Předmět:
Zdroj: Wetlands. 24:870-878
ISSN: 1943-6246
0277-5212
DOI: 10.1672/0277-5212(2004)024[0870:difsmo]2.0.co;2
Popis: In the past century, loading of terrestrial inorganic nitrogen to coastal receiving waters has increased dramatically. Salt marshes, because of their location between upland regions and coastal waters and their recognized role as nutrient transformers, have the potential to ameliorate some of this loading. In the current study, we used core incubations in the laboratory to investigate denitrification rates in high marsh soils from five fringing salt marshes in Narragansett Bay, Rhode Island, USA. The marshes showed a wide variety of terrestrial N loading, with rates ranging from 2 to 6037 kg N ha−1 yr−1. Field-collected cores were selected to include both vegetated and bare soils at each marsh, and the six-hour incubations were designed to approximate natural tidal rhythms. Total dissolved nitrogen flux in these marshes ranged between +1255 and −710 μmol N m−2 hr−1, with N2 gas accounting for the majority of the total N flux (average 76%). Nitrogen gas flux ranged between −375 (nitrogen fixation)...
Databáze: OpenAIRE
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