DOI: 10.1002/2016GL069621
论文题名: Impact of photochemical processing of DOC on the bacterioplankton respiratory quotient in aquatic ecosystems
作者: Allesson L. ; Ström L. ; Berggren M.
刊名: Geophysical Research Letters
ISSN: 0094-8835
EISSN: 1944-8566
出版年: 2016
卷: 43, 期: 14 起始页码: 7538
结束页码: 7545
语种: 英语
英文关键词: bacterioplankton respiration
; photooxidation
Scopus关键词: Carbon
; Carbon dioxide
; Ecology
; Ecosystems
; Organic carbon
; Photooxidation
; Substrates
; Bacterial metabolism
; Bacterioplanktons
; Chemical compositions
; Dissolved organic carbon
; Freshwater ecosystem
; Photochemical processing
; Photochemical production
; Respiratory quotients
; Aquatic ecosystems
; aquatic ecosystem
; bacterioplankton
; bioassay
; chemical composition
; dissolved organic carbon
; experimental study
; lake water
; metabolism
; photochemistry
; photooxidation
; respiration
; Bacteria (microorganisms)
英文摘要: Many studies assume a respiratory quotient (RQ = molar ratio of CO2 produced to O2 consumed) close to 1 when calculating bacterioplankton respiration. However, evidence suggests that RQ depends on the chemical composition of the respired substrate pool that may be altered by photochemical production of oxygen-rich substrates, resulting in elevated RQs. Here we conducted a novel study of the impact of photochemical processing of dissolved organic carbon (DOC) on RQ. We monitored the bacterial RQ in bioassays of both ultraviolet light irradiated and nonirradiated humic lake water, using optic gas-pressure sensors. In the experimentally irradiated samples the average RQ value was significantly higher (3.4–3.5 [±0.4 standard error (SE)]) than that in the dark controls (1.3 [±0.1 SE]). Our results show that the RQ is systematically higher than 1 when the bacterial metabolism in large part is based on photoproducts. By assuming an RQ of 1, bacterioplankton respiration in freshwater ecosystems may be greatly underestimated. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84982103500&doi=10.1002%2f2016GL069621&partnerID=40&md5=5d1262e03bb374e6b74b88274a60a477
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9798
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden
Recommended Citation:
Allesson L.,Ström L.,Berggren M.. Impact of photochemical processing of DOC on the bacterioplankton respiratory quotient in aquatic ecosystems[J]. Geophysical Research Letters,2016-01-01,43(14).