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DOI10.1007/s10533-014-9971-4
Effects of urban stream burial on organic matter dynamics and reach scale nitrate retention
Beaulieu, Jake J.1; Mayer, Paul M.2; Kaushal, Sujay S.3,4; Pennino, Michael J.3,4; Arango, Clay P.5; Balz, David A.6; Canfield, Timothy J.2; Elonen, Colleen M.7; Fritz, Ken M.8; Hill, Brian H.7; Ryu, Hodon1; Domingo, Jorge W. Santo1
发表日期2014-10-01
ISSN0168-2563
卷号121期号:1页码:107-126
英文摘要

Nitrogen (N) retention in streams is an important ecosystem service that may be affected by the widespread burial of streams in stormwater pipes in urban watersheds. We predicted that stream burial suppresses the capacity of streams to retain nitrate (NO3 (-)) by eliminating primary production, reducing respiration rates and organic matter availability, and increasing specific discharge. We tested these predictions by measuring whole-stream NO3 (-) removal rates using (NO3)-N-15 (-) isotope tracer releases in paired buried and open reaches in three streams in Cincinnati, Ohio (USA) during four seasons. Nitrate uptake lengths were 29 times greater in buried than open reaches, indicating that buried reaches were less effective at retaining NO3 (-) than open reaches. Burial suppressed NO3 (-) retention through a combination of hydrological and biological processes. The channel shape of two of the buried reaches increased specific discharge which enhanced NO3 (-) transport from the channel, highlighting the relationship between urban infrastructure and ecosystem function. Uptake lengths in the buried reaches were further lengthened by low stream biological NO3 (-) demand, as indicated by NO3 (-) uptake velocities 17-fold lower than that of the open reaches. We also observed differences in the periphyton enzyme activity between reaches, indicating that the effects of burial cascade from the microbial to the ecosystem scale. Our results suggest that stream restoration practices involving "daylighting" buried streams have the potential to increase N retention. Further work is needed to elucidate the impacts of stream burial on ecosystem functions at the larger stream network scale.


英文关键词Extracellular enzyme activity;Stable isotope;Bacteria;Uptake length;Uptake velocity;N-15
语种英语
WOS记录号WOS:000341908600006
来源期刊BIOGEOCHEMISTRY
来源机构美国环保署
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/60058
作者单位1.US EPA, Off Res & Dev, Natl Risk Management Res Lab, Cincinnati, OH 45268 USA;
2.US EPA, Off Res & Dev, Natl Risk Management Res Lab, Ada, OK 74821 USA;
3.Univ Maryland, Dept Geol, College Pk, MD 20742 USA;
4.Univ Maryland, Earth Syst Interdisciplinary Ctr, College Pk, MD 20742 USA;
5.Cent Washington Univ, Dept Biol Sci, Ellensburg, WA 98926 USA;
6.Pegasus Tech Serv, Cincinnati, OH 45268 USA;
7.US EPA, Off Res & Dev, Natl Hlth & Environm Effects Res Lab, Duluth, MN 55804 USA;
8.US EPA, Off Res & Dev, Natl Exposure Res Lab, Cincinnati, OH 45268 USA
推荐引用方式
GB/T 7714
Beaulieu, Jake J.,Mayer, Paul M.,Kaushal, Sujay S.,et al. Effects of urban stream burial on organic matter dynamics and reach scale nitrate retention[J]. 美国环保署,2014,121(1):107-126.
APA Beaulieu, Jake J..,Mayer, Paul M..,Kaushal, Sujay S..,Pennino, Michael J..,Arango, Clay P..,...&Domingo, Jorge W. Santo.(2014).Effects of urban stream burial on organic matter dynamics and reach scale nitrate retention.BIOGEOCHEMISTRY,121(1),107-126.
MLA Beaulieu, Jake J.,et al."Effects of urban stream burial on organic matter dynamics and reach scale nitrate retention".BIOGEOCHEMISTRY 121.1(2014):107-126.
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