DOI: 10.1007/s10533-013-9901-x
Scopus记录号: 2-s2.0-84896397315
论文题名: Metabolism of a nitrogen-enriched coastal marine lagoon during the summertime
作者: Howarth R.W. ; Hayn M. ; Marino R.M. ; Ganju N. ; Foreman K. ; McGlathery K. ; Giblin A.E. ; Berg P. ; Walker J.D.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 118, 期: 2018-01-03 起始页码: 1
结束页码: 20
语种: 英语
英文关键词: Estuary
; Eutrophication
; Gross primary production
; Lagoon
; Net ecosystem production
; Nitrogen limitation
; Nitrogen pollution
; Nutrient limitation
; Seagrass
Scopus关键词: alga
; coastal lagoon
; dissolved oxygen
; estuarine environment
; eutrophication
; hypoxia
; metabolism
; net ecosystem production
; nutrient enrichment
; nutrient limitation
; pH
; phytoplankton
; respiration
; seagrass
; Cape Cod
; Massachusetts
; United States
; algae
英文摘要: We measured metabolism rates in a shallow, nitrogen-enriched coastal marine ecosystem on Cape Cod (MA, USA) during seven summers using an open-water diel oxygen method. We compared two basins, one directly receiving most of the nitrogen (N) load ("Snug Harbor") and another further removed from the N load and better flushed ("Outer Harbor"). Both dissolved oxygen and pH varied greatly over the day, increasing in daylight and decreasing at night. The more N-enriched basin frequently went hypoxic during the night, and the pH in both basins was low (compared to standard seawater) when the oxygen levels were low, due to elevated carbon dioxide. Day-to-day variation in gross primary production (GPP) was high and linked in part to variation in light. Whole-ecosystem respiration tended to track this short-term variation in GPP, suggesting that respiration by the primary producers often dominated whole-system respiration. GPP was higher in the more N-loaded Snug Harbor. Seagrasses covered over 60 % of the area of the better-flushed, Outer Harbor throughout our study and were the major contributors to GPP there. Seagrasses covered 20 % of the area in Snug Harbor for the first 5 years of our study, and their contribution to GPP was relatively small. The seagrasses in Snug Harbor died off completely in the 6th year, but GPP remained high then and in the subsequent year. Overall, rates of phytoplankton GPP were relatively low, suggesting that benthic micro- and macro-algae may be the dominant primary producers in Snug Harbor in most years. Net ecosystem production in both Snug Harbor and the Outer Harbor was variable from year to year, showing net heterotrophy in some years and net autotrophy in others, with a trend towards increasing autotrophy over the 7 years reported here. © 2013 Springer Science+Business Media Dordrecht. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83592
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY, 14853, United States; The Ecosystems Center, Marine Biological Laboratory, Woods Hole, MA, 02543, United States; US Geological Survey, Woods Hole, MA, 02543, United States; Department of Environmental Sciences, University of Virginia, Charlottesville, VA, 22904, United States; Department of Civil and Environmental Engineering, Tufts University, Medford, MA, 02155, United States
Recommended Citation:
Howarth R.W.,Hayn M.,Marino R.M.,et al. Metabolism of a nitrogen-enriched coastal marine lagoon during the summertime[J]. Biogeochemistry,2014-01-01,118(2018-01-03)