globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13370
论文题名:
Similar temperature responses suggest future climate warming will not alter partitioning between denitrification and anammox in temperate marine sediments
作者: Brin L.D.; Giblin A.E.; Rich J.J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期:1
起始页码: 331
结束页码: 340
语种: 英语
英文关键词: activation energy ; anammox ; climate change ; denitrification ; marine sediment ; temperature dependence
Scopus关键词: activation energy ; air temperature ; ammonium ; climate change ; denitrification ; marine sediment ; nitrogen ; nutrient availability ; oxidation ; partitioning ; Rhode Island ; United States
英文摘要: Removal of biologically available nitrogen (N) by the microbially mediated processes denitrification and anaerobic ammonium oxidation (anammox) affects ecosystem N availability. Although few studies have examined temperature responses of denitrification and anammox, previous work suggests that denitrification could become more important than anammox in response to climate warming. To test this hypothesis, we determined whether temperature responses of denitrification and anammox differed in shelf and estuarine sediments from coastal Rhode Island over a seasonal cycle. The influence of temperature and organic C availability was further assessed in a 12-week laboratory microcosm experiment. Temperature responses, as characterized by thermal optima (Topt) and apparent activation energy (Ea), were determined by measuring potential rates of denitrification and anammox at 31 discrete temperatures ranging from 3 to 59 °C. With a few exceptions, Topt and Ea of denitrification and anammox did not differ in Rhode Island sediments over the seasonal cycle. In microcosm sediments, Ea was somewhat lower for anammox compared to denitrification across all treatments. However, Topt did not differ between processes, and neither Ea nor Topt changed with warming or carbon addition. Thus, the two processes behaved similarly in terms of temperature responses, and these responses were not influenced by warming. This led us to reject the hypothesis that anammox is more cold-adapted than denitrification in our study system. Overall, our study suggests that temperature responses of both processes can be accurately modeled for temperate regions in the future using a single set of parameters, which are likely not to change over the next century as a result of predicted climate warming. We further conclude that climate warming will not directly alter the partitioning of N flow through anammox and denitrification. © 2016 John Wiley & Sons Ltd
资助项目: Thank you to Caroline Scanlan, Phil Arevalo, Michaeline Nelson, Amber Hardison, and Heather Leslie for help in the laboratory and the field. Thanks also to Elise Heiss, Lindsey Fields, Shelley Brown, Wally Fulweiler, Scott Nixon, Bethany Jenkins, Jane Tucker, Steve Granger, Rodman Sykes, Rebecca Robinson, Stephen Porder, and Aaron McFarlane for help in the project, and to Charlie Vickers, Mike Packer, and Brian Corkum for help with thermoblock construction. We are grateful to Capt. Rodman Sykes of the F/V Virginia Marise and his crew for assisting with sampling. We thank two anonymous reviewers whose comments have helped to improve this manuscript. This material is based upon work supported by the National Science Foundation under Grant No. OCE-0852289 to JJR and OCE-0852263, OCE-0927400 and OCE1238212 to AEG, and Rhode Island Sea Grant to JJR.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61199
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作者单位: Canadian Rivers Institute, University of New Brunswick, 100 Tucker Park Road, Saint John, NB, Canada; Ecosystems Center, Marine Biological Laboratory, 7 MBL Street, Woods Hole, MA, United States; School of Marine Sciences, Darling Marine Center, University of Maine, Walpole, ME, United States

Recommended Citation:
Brin L.D.,Giblin A.E.,Rich J.J.. Similar temperature responses suggest future climate warming will not alter partitioning between denitrification and anammox in temperate marine sediments[J]. Global Change Biology,2017-01-01,23(1)
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