globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2807
论文题名:
Impact of warming on CO2 emissions from streams countered by aquatic photosynthesis
作者: Demars B.O.L.; Gíslason G.M.; Ólafsson J.S.; Manson J.R.; Friberg N.; Hood J.M.; Thompson J.J.D.; Freitag T.E.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期:10
起始页码: 758
结束页码: 761
语种: 英语
Scopus关键词: activation energy ; carbon dioxide ; carbon emission ; emission inventory ; geothermal system ; organic carbon ; photosynthesis ; respiration ; river system ; stream ; warming ; water temperature ; Iceland ; Kamchatka ; North America ; Russian Federation
英文摘要: Streams and rivers are an important source of CO2 emissions. One important control of these emissions is the metabolic balance between photosynthesis, which converts CO2 to organic carbon, and respiration, which converts organic carbon into CO2 (refs,). Carbon emissions from rivers could increase with warming, independently of organic carbon inputs, because the apparent activation energy is predicted to be higher for respiration than photosynthesis. However, physiological CO2 -concentrating mechanisms may prevent the increase in photorespiration, limiting photosynthesis with warming. Here we report the thermal response of aquatic photosynthesis from streams located in geothermal areas of North America, Iceland and Kamchatka with water temperatures ranging between 4 and 70 °C. Based on a thermodynamic theory of enzyme kinetics, we show that the apparent activation energy of aquatic ecosystem photosynthesis is approximately 0.57 electron volts (eV) for temperatures ranging from 4 to 45 °C, which is similar to that of respiration. This result and a global synthesis of 222 streams suggest that warming will not create increased stream and river CO2 emissions from a warming-induced imbalance between photosynthesis and respiration. However, temperature could affect annual CO2 emissions from streams if ecosystem respiration is independent of gross primary production, and may be amplified by increasing organic carbon supply. © 2016 Macmillan Publishers Limited, part of Springer Nature.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105920
Appears in Collections:气候减缓与适应
科学计划与规划

Files in This Item:

There are no files associated with this item.


作者单位: James Hutton Institute, Craigiebuckler, Aberdeen, United Kingdom; University of Iceland, Institute of Life and Environmental Sciences, Sturlugata 7, Reykjavik, Iceland; Marine and Freshwater Research Institute, Árleyni 22, Reykjavik, Iceland; Stockton University, Applied Physics, Galloway, NJ, United States; Norwegian Institute forWater Research, Gaustaallen 21, Oslo, Norway; School of Geography, University of Leeds, Leeds, United Kingdom; Department of Ecology, Montana State University, Bozeman, MN, United States; Bangor University, School of Environment, Natural Resources and Geography, Deiniol Road, Bangor, Gwynedd, United Kingdom; Department of Evolution, Ecology, and Organismal Biology, Aquatic Ecology Laboratory, Ohio State University, Columbus, OH, United States; Smithsonian Environmental Research Center, PO Box 28, Edgewater, MD, United States

Recommended Citation:
Demars B.O.L.,Gíslason G.M.,Ólafsson J.S.,et al. Impact of warming on CO2 emissions from streams countered by aquatic photosynthesis[J]. Nature Geoscience,2016-01-01,9(10)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Demars B.O.L.]'s Articles
[Gíslason G.M.]'s Articles
[Ólafsson J.S.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Demars B.O.L.]'s Articles
[Gíslason G.M.]'s Articles
[Ólafsson J.S.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Demars B.O.L.]‘s Articles
[Gíslason G.M.]‘s Articles
[Ólafsson J.S.]‘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.