DOI: 10.1016/j.watres.2018.02.042
Scopus记录号: 2-s2.0-85046041373
论文题名: Composition, sources, and bioavailability of nitrogen in a longitudinal gradient from freshwater to estuarine waters
作者: Jani J. ; Toor G.S.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 137 起始页码: 344
结束页码: 354
语种: 英语
英文关键词: Bioavailability
; Dissolved organic nitrogen
; Estuarine
; Freshwater
; Nitrogen
; Stable isotopes
; Tampa bay estuary
Scopus关键词: Bacteria
; Biochemistry
; Biodegradation
; Ecosystems
; Eutrophication
; Fertilizers
; Isotopes
; Nitrogen
; Water quality
; Bioavailability
; Dissolved organic nitrogen
; Estuarine
; Freshwater
; Stable isotopes
; Tampa Bay
; Estuaries
; brackish water
; fertilizer
; fresh water
; nitrate
; organic nitrogen
; stable isotope
; water
; fresh water
; nitric acid derivative
; nitrogen
; bioassay
; bioavailability
; concentration (composition)
; dissolved organic nitrogen
; estuarine environment
; eutrophication
; freshwater environment
; inorganic nitrogen
; nitrogen
; stable isotope
; water quality
; Article
; bioassay
; bioavailability
; concentration (parameters)
; controlled study
; Florida
; microorganism
; nitrification
; nonhuman
; particulate matter
; priority journal
; water quality
; Bayes theorem
; bioavailability
; chemistry
; ecosystem
; estuary
; eutrophication
; soil
; theoretical model
; Florida [United States]
; Tampa Bay
; United States
; algae
; Bayes Theorem
; Biological Availability
; Ecosystem
; Estuaries
; Eutrophication
; Fertilizers
; Florida
; Fresh Water
; Models, Theoretical
; Nitrates
; Nitrification
; Nitrogen
; Soil
; Water Quality
英文摘要: Nitrogen (N) transport from land to water is a dominant contributor of N in estuarine waters leading to eutrophication, harmful algal blooms, and hypoxia. Our objectives were to (1) investigate the composition of inorganic and organic N forms, (2) distinguish the sources and biogeochemical mechanisms of nitrate–N (NO3–N) transport using stable isotopes of NO3 − and Bayesian mixing model, and (3) determine the dissolved organic N (DON) bioavailability using bioassays in a longitudinal gradient from freshwater to estuarine ecosystem located in the Tampa Bay, Florida, United States. We found that DON was the most dominant N form (mean: 64%, range: 46–83%) followed by particulate organic N (PON, mean: 22%, range: 14–37%), whereas inorganic N forms (NOx–N: 7%, NH4–N: 7%) were 14% of total N in freshwater and estuarine waters. Stable isotope data of NO3 − revealed that nitrification was the main contributor (36.4%), followed by soil and organic N sources (25.5%), NO3 − fertilizers (22.4%), and NH4 + fertilizers (15.7%). Bioassays showed that 14 to 65% of DON concentrations decreased after 5-days of incubation indicating utilization of DON by microbes in freshwater and estuarine waters. These results suggest that despite low proportion of inorganic N forms, the higher concentrations and bioavailability of DON can be a potential source of N for algae and bacteria leading to water quality degradation in the estuarine waters. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112818
Appears in Collections: 气候减缓与适应
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作者单位: Soil and Water Quality Laboratory, Gulf Coast Research and Education Center, University of Florida, Wimauma, FL 33598, United States; Chemistry Department, Faculty of Science, University of Malaya, Kuala Lumpur, 50603, Malaysia; Department of Environmental Science and Technology, University of Maryland, College Park, MD 20742, United States
Recommended Citation:
Jani J.,Toor G.S.. Composition, sources, and bioavailability of nitrogen in a longitudinal gradient from freshwater to estuarine waters[J]. Water Research,2018-01-01,137