DOI: 10.1007/s10533-015-0113-4
Scopus记录号: 2-s2.0-84938286157
论文题名: Effects of experimental warming and carbon addition on nitrate reduction and respiration in coastal sediments
作者: Brin L.D. ; Giblin A.E. ; Rich J.J.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 125, 期: 1 起始页码: 81
结束页码: 95
语种: 英语
英文关键词: Anammox
; Climate change
; Continental shelf
; Denitrification
; Dissimilatory nitrate reduction to ammonium
; Warming
Scopus关键词: ammonium
; climate change
; coastal sediment
; continental shelf
; experimental study
; nitrate
; nutrient availability
; oxygen
; reduction
; seawater
; sediment chemistry
; sediment-water interface
英文摘要: Climate change may have differing effects on microbial processes that control coastal N availability. We conducted a microcosm experiment to explore effects of warming and carbon availability on nitrate reduction pathways in marine sediments. Sieved continental shelf sediments were incubated for 12 weeks under aerated seawater amended with nitrate (~50 μM), at winter (4 °C) or summer (17 °C) temperatures, with or without biweekly particulate organic C additions. Treatments increased diffusive oxygen consumption as expected, with somewhat higher effects of C addition compared to warming. Combined warming and C addition had the strongest effect on nitrate flux across the sediment water interface, with a complete switch early in the experiment from influx to sustained efflux. Supporting this result, vial incubations with added 15N-nitrate indicated that C addition stimulated potential rates of dissimilatory nitrate reduction to ammonium (DNRA), but not denitrification. Overall capacity for both denitrification and DNRA was reduced in warmed treatments, possibly reflecting C losses due to increased respiration with warming. Anammox potential rates were much lower than DNRA or denitrification, and were slightly negatively affected by warming or C addition. Overall, results indicate that warming and C addition increased ammonium production through remineralization and possibly DNRA. This stimulated nitrate production through nitrification, but without a comparable increase in nitrate consumption through denitrification. The response to C of potential DNRA rates over denitrification, along with a switch to nitrate efflux, raises the possibility that DNRA is an important and previously overlooked source of internal N cycling in shelf sediments. © 2015, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83484
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, Brown University, 80 Waterman Street, Providence, RI, United States; Ecosystems Center, Marine Biological Laboratory, 7 MBL Street, Woods Hole, MA, United States; Potato Research Centre, Agriculture and Agri-Food Canada, 850 Lincoln Road, Fredericton, Canada
Recommended Citation:
Brin L.D.,Giblin A.E.,Rich J.J.. Effects of experimental warming and carbon addition on nitrate reduction and respiration in coastal sediments[J]. Biogeochemistry,2015-01-01,125(1)