DOI: 10.1007/s10533-017-0369-y
Scopus记录号: 2-s2.0-85027967855
论文题名: Assimilation and nitrification in pelagic waters: insights using dual nitrate stable isotopes (δ15N, δ18O) in a shallow lake
作者: Botrel M. ; Bristow L.A. ; Altabet M.A. ; Gregory-Eaves I. ; Maranger R.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 135, 期: 3 起始页码: 221
结束页码: 237
语种: 英语
英文关键词: Assimilation
; Cyanobacteria
; Lake
; Nitrate
; Nitrification
; Nitrogen cycling
; Stable isotopes
Scopus关键词: assimilation efficiency
; concentration (composition)
; cyanobacterium
; eutrophic environment
; isotopic composition
; lake water
; nitrate
; nitrification
; nitrogen cycle
; oxygen isotope
; pelagic environment
; phytoplankton
; primary production
; shallow water
; stable isotope
; Cyanobacteria
英文摘要: Nitrate dual stable isotopes (δ15N and δ18O of NO3 −) have proven to be a powerful technique to elucidate nitrogen (N) cycling pathways in aquatic systems. We applied this technique for the first time in the pelagic zone of a small temperate meso-eutrophic lake to identify the dominant N cycling pathways, and their spatial and temporal variability. We measured the lake NO3 − δ15N and δ18O signatures over an annual cycle and compared them to that of the watershed. Both δ15N and δ18O of NO3 − in the lake increased during summer relative to the inputs. Relationships between lake NO3 − isotopic composition and concentrations were different across thermal strata with an apparent isotope effect in the epilimnion of 15εepi = 4.6‰ and 18εepi = 10.9‰. We found a strong deviation of the lake NO3 − δ18O and δ15N from the expected 1:1 line for assimilation (slope = 1.73) suggesting that nitrification was co-occurring. We estimated that nitrification could support between 5 and 30% of nitrate-based production during the growing season, but was negligible in early spring and fall, and probably more dominant under ice. We showed that the technique is promising to study N processes at the ecosystem scale in shallow lakes, particularly during winter. Our results suggest that recycled NO3 − could support primary productivity and influence phytoplankton composition in the surface waters of small lakes. © 2017, Springer International Publishing AG. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83243
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: Groupe de Recherche Interuniversitaire en Limnologie et en environnement aquatique (GRIL), Département des sciences biologiques, Université de Montréal, C.P. 6128 succ. Centre-ville, Montréal, QC, Canada; School of Marine Science and Technology, University of Massachusetts Darthmouth, 706 S Rodney French Blvd, New Bedford, MA, United States; GRIL, Department of Biology, McGill University, 1205 avenue du Docteur-Penfield, Montréal, QC, Canada; Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, Bremen, Germany
Recommended Citation:
Botrel M.,Bristow L.A.,Altabet M.A.,et al. Assimilation and nitrification in pelagic waters: insights using dual nitrate stable isotopes (δ15N, δ18O) in a shallow lake[J]. Biogeochemistry,2017-01-01,135(3)