DOI: 10.1007/s10533-016-0280-y
Scopus记录号: 2-s2.0-85000885313
论文题名: Ecosystem metabolism and greenhouse gas production in a mesotrophic northern temperate lake experiencing seasonal hypoxia
作者: Salk K.R. ; Ostrom P.H. ; Biddanda B.A. ; Weinke A.D. ; Kendall S.T. ; Ostrom N.E.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2016
卷: 131, 期: 3 起始页码: 303
结束页码: 319
语种: 英语
英文关键词: Ecosystem metabolism
; Hypoxia
; Methane
; Nitrification
; Nitrous oxide
; Site preference
Scopus关键词: chemical mass balance
; ecosystem function
; emission
; enrichment
; eutrophication
; greenhouse gas
; hypoxia
; isotopic analysis
; lacustrine environment
; methane
; nitrification
; nitrous oxide
; oxidation
; primary production
; respiration
; sampling
; site selection
; Michigan
; Muskegon Lake
; United States
英文摘要: Many lacustrine systems, despite management efforts to control eutrophication, are hypoxic during stratified periods. Hypoxia is a major concern, not only for its impact on aquatic life but also for its potential to stimulate production of the greenhouse gases, methane (CH4) and nitrous oxide (N2O). We investigated the drivers of hypoxia in Muskegon Lake, a temperate dimictic freshwater estuary that experiences frequent hypolimnetic mixing due to atmospheric forces, riverine inputs, and intrusion of oxic water from coastal upwelling in Lake Michigan. Primary production and respiration (R) rates obtained from a δ18O mass balance model were similar to other mesotrophic environments (0.56–26.31 and 0.57–13.15 mmol O2 m−3 day−1, respectively), although high P/R (≥2 in mid-summer) indicated there is sufficient autochthonous production to support hypoxia development and persistence. The isotopic enrichment factor for respiration (εobs) varied markedly and was least negative in August of both sampling years, consistent with high R rates. Hypoxic conditions were associated with accumulation of N2O but not CH4, and emissions of N2O are among the highest reported from lakes. The average N2O site preference value of 25.4‰ indicates that the majority of N2O was produced by nitrification via hydroxylamine oxidation, despite the presence of resilient hypoxia. While it has been hypothesized that denitrification acts as a sink for N2O in hypoxic lakes, it is clear that Muskegon Lake functions as a strong source of N2O via nitrification. Further considerations of lakes as global sources of N2O thus warrant a closer evaluation of nitrification-fueled N2O production. © 2016, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83329
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 Integrative Biology, Michigan State University, East Lansing, MI, United States; Annis Water Resources Institute, Grand Valley State University, Muskegon, MI, United States
Recommended Citation:
Salk K.R.,Ostrom P.H.,Biddanda B.A.,et al. Ecosystem metabolism and greenhouse gas production in a mesotrophic northern temperate lake experiencing seasonal hypoxia[J]. Biogeochemistry,2016-01-01,131(3)