Arid
DOI10.1007/s10021-015-9918-1
Metabolism, Gas Exchange, and Carbon Spiraling in Rivers
Hall, Robert O., Jr.1; Tank, Jennifer L.2; Baker, Michelle A.3,4; Rosi-Marshall, Emma J.5; Hotchkiss, Erin R.6,7,8
通讯作者Hall, Robert O., Jr.
来源期刊ECOSYSTEMS
ISSN1432-9840
EISSN1435-0629
出版年2016
卷号19期号:1页码:73-86
英文摘要

Ecosystem metabolism, that is, gross primary productivity (GPP) and ecosystem respiration (ER), controls organic carbon (OC) cycling in stream and river networks and is expected to vary predictably with network position. However, estimates of metabolism in small streams outnumber those from rivers such that there are limited empirical data comparing metabolism across a range of stream and river sizes. We measured metabolism in 14 rivers (discharge range 14-84 m(3) s(-1)) in the Western and Midwestern United States (US). We estimated GPP, ER, and gas exchange rates using a Lagrangian, 2-station oxygen model solved in a Bayesian framework. GPP ranged from 0.6-22 g O-2 m(-2) d(-1) and ER tracked GPP, suggesting that autotrophic production supports much of riverine ER in summer. Net ecosystem production, the balance between GPP and ER was 0 or greater in 4 rivers showing autotrophy on that day. River velocity and slope predicted gas exchange estimates from these 14 rivers in agreement with empirical models. Carbon turnover lengths (that is, the distance traveled before OC is mineralized to CO2) ranged from 38 to 1190 km, with the longest turnover lengths in high-sediment, arid-land rivers. We also compared estimated turnover lengths with the relative length of the river segment between major tributaries or lakes; the mean ratio of carbon turnover length to river length was 1.6, demonstrating that rivers can mineralize much of the OC load along their length at baseflow. Carbon mineralization velocities ranged from 0.05 to 0.81 m d(-1), and were not different than measurements from small streams. Given high GPP relative to ER, combined with generally short OC spiraling lengths, rivers can be highly reactive with regard to OC cycling.


英文关键词rivers gross primary production Ecosystem respiration carbon spiraling gas exchange ecosystem metabolism
类型Article
语种英语
国家USA ; Canada
收录类别SCI-E
WOS记录号WOS:000373017800006
WOS关键词ECOSYSTEM METABOLISM ; ORGANIC-CARBON ; TEMPORAL VARIABILITY ; RESPIRATION ; PRODUCTIVITY ; REAERATION ; RATES ; RESTORATION ; CONTINUUM ; NITROGEN
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/192516
作者单位1.Univ Wyoming, Dept Zool & Physiol, Laramie, WY 82071 USA;
2.Univ Notre Dame, Dept Biol Sci, Notre Dame, IN 46556 USA;
3.Utah State Univ, Dept Biol, Logan, UT 84322 USA;
4.Utah State Univ, Ctr Ecol, Logan, UT 84322 USA;
5.Cary Inst Ecosyst Studies, Box AB, Millbrook, NY 12545 USA;
6.Univ Wyoming, Program Ecol, Laramie, WY 82071 USA;
7.Univ Wyoming, Dept Zool & Physiol, Laramie, WY 82071 USA;
8.Univ Quebec, Dept Sci Biol, Montreal, PQ H3C 3P8, Canada
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Hall, Robert O., Jr.,Tank, Jennifer L.,Baker, Michelle A.,et al. Metabolism, Gas Exchange, and Carbon Spiraling in Rivers[J],2016,19(1):73-86.
APA Hall, Robert O., Jr.,Tank, Jennifer L.,Baker, Michelle A.,Rosi-Marshall, Emma J.,&Hotchkiss, Erin R..(2016).Metabolism, Gas Exchange, and Carbon Spiraling in Rivers.ECOSYSTEMS,19(1),73-86.
MLA Hall, Robert O., Jr.,et al."Metabolism, Gas Exchange, and Carbon Spiraling in Rivers".ECOSYSTEMS 19.1(2016):73-86.
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