globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12190
Scopus记录号: 2-s2.0-84978891225
论文题名:
Chemodenitrification in the cryoecosystem of Lake Vida, Victoria Valley, Antarctica
作者: Ostrom N.E.; Gandhi H.; Trubl G.; Murray A.E.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2016
卷: 14, 期:6
起始页码: 575
结束页码: 587
语种: 英语
Scopus关键词: ammonium ; aquatic environment ; atmospheric deposition ; brine ; concentration (composition) ; denitrification ; geochemistry ; microbial activity ; nitrate ; nitrous oxide ; oxidation ; oxygen isotope ; reduction ; Antarctica ; Australia ; East Antarctica ; Lake Vida ; Victoria Valley [Victoria] ; Victoria [Australia] ; nitric acid derivative ; nitrogen ; nitrous oxide ; Antarctica ; chemistry ; denitrification ; lake ; metabolism ; microbiology ; Antarctic Regions ; Denitrification ; Lakes ; Nitrates ; Nitrogen ; Nitrogen Isotopes ; Nitrous Oxide
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences ; Environmental Science: General Environmental Science ; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: Lake Vida, in the Victoria Valley of East Antarctica, is frozen, yet harbors liquid brine (~20% salt, >6 times seawater) intercalated in the ice below 16 m. The brine has been isolated from the surface for several thousand years. The brine conditions (permanently dark, −13.4 °C, lack of O2, and pH of 6.2) and geochemistry are highly unusual. For example, nitrous oxide (N2O) is present at a concentration among the highest reported for an aquatic environment. Only a minor 17O anomaly was observed in N2O, indicating that this gas was predominantly formed in the lake. In contrast, the 17O anomaly in nitrate ((Formula presented.)) in Lake Vida brine indicates that approximately half or more of the (Formula presented.) present is derived from atmospheric deposition. Lake Vida brine was incubated in the presence of 15N-enriched substrates for 40 days. We did not detect microbial nitrification, dissimilatory reduction of (Formula presented.) to ammonium ((Formula presented.)), anaerobic ammonium oxidation, or denitrification of N2O under the conditions tested. In the presence of 15N-enriched nitrite ((Formula presented.)), both N2 and N2O exhibited substantial 15N enrichments; however, isotopic enrichment declined with time, which is unexpected. Additions of 15N– (Formula presented.) alone and in the presence of HgCl2 and ZnCl2 to aged brine at −13 °C resulted in linear increases in the δ15N of N2O with time. As HgCl2 and ZnCl2 are effective biocides, we interpret N2O production in the aged brine to be the result of chemodenitrification. With this understanding, we interpret our results from the field incubations as the result of chemodenitrification stimulated by the addition of 15N-enriched (Formula presented.) and ZnCl2 and determined rates of N2O and N2 production of 4.11–41.18 and 0.55–1.75 nmol L−1 day−1, respectively. If these rates are representative of natural production, the current concentration of N2O in Lake Vida could have been reached between 6 and 465 years. Thus, chemodenitrification alone is sufficient to explain the high levels of N2O present in Lake Vida. © 2016 John Wiley & Sons Ltd
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85086
Appears in Collections:影响、适应和脆弱性

Files in This Item:

There are no files associated with this item.


作者单位: Department of Integrative Biology, Michigan State University, East Lansing, MI, United States; Division of Earth and Ecosystem Sciences, Desert Research Institute, Reno, NV, United States

Recommended Citation:
Ostrom N.E.,Gandhi H.,Trubl G.,et al. Chemodenitrification in the cryoecosystem of Lake Vida, Victoria Valley, Antarctica[J]. Geobiology,2016-01-01,14(6)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Ostrom N.E.]'s Articles
[Gandhi H.]'s Articles
[Trubl G.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Ostrom N.E.]'s Articles
[Gandhi H.]'s Articles
[Trubl G.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Ostrom N.E.]‘s Articles
[Gandhi H.]‘s Articles
[Trubl G.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.