Arid
DOI10.4319/lo.2009.54.6.2128
Hydrologic control of nitrogen removal, storage, and export in a mountain stream
Hall, Robert O., Jr.1; Baker, Michelle A.2,3; Arp, Christopher D.2,3; Koch, Benjamin J.1,4
通讯作者Hall, Robert O., Jr.
来源期刊LIMNOLOGY AND OCEANOGRAPHY
ISSN0024-3590
EISSN1939-5590
出版年2009
卷号54期号:6页码:2128-2142
英文摘要

Nutrient cycling and export in streams and rivers should vary with flow regime, yet most studies of stream nutrient transformation do not include hydrologic variability. We used a stable isotope tracer of nitrogen (N-15) to measure nitrate (NO3-) uptake, storage, and export in a mountain stream, Spring Creek, Idaho, U. S. A. We conducted two tracer tests of 2-week duration during snowmelt and baseflow. Dissolved and particulate forms of N-15 were monitored over three seasons to test the hypothesis that stream N cycling would be dominated by export during floods, and storage during low flow. Floods exported more N than during baseflow conditions; however, snowmelt floods had higher than expected demand for NO3- because of hyporheic exchange. Residence times of benthic N during both tracer tests were longer than 100 d for ephemeral pools such as benthic algae and wood biofilms. Residence times were much longer in fine detritus, insects, and the particulate N from the hyporheic zone, showing that assimilation and hydrologic storage can be important mechanisms for retaining particulate N. Of the tracer N stored in the stream, the primary form of export was via seston during periods of high flows, produced by summer rainstorms or spring snowmelt the following year. Spring Creek is not necessarily a conduit for nutrients during high flow; hydrologic exchange between the stream and its valley represents an important storage mechanism.


类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000270390200026
WOS关键词DESERT STREAM ; FOREST STREAM ; NITRATE REMOVAL ; DENITRIFICATION ; RETENTION ; TRANSPORT ; TRANSFORMATION ; WATERSHEDS ; DYNAMICS ; QUANTIFICATION
WOS类目Limnology ; Oceanography
WOS研究方向Marine & Freshwater Biology ; Oceanography
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/161891
作者单位1.Univ Wyoming, Dept Zool & Physiol, Laramie, WY 82071 USA;
2.Utah State Univ, Dept Biol, Logan, UT 84322 USA;
3.Utah State Univ, Ctr Ecol, Logan, UT 84322 USA;
4.Univ Wyoming, Program Ecol, Laramie, WY 82071 USA
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Hall, Robert O., Jr.,Baker, Michelle A.,Arp, Christopher D.,et al. Hydrologic control of nitrogen removal, storage, and export in a mountain stream[J],2009,54(6):2128-2142.
APA Hall, Robert O., Jr.,Baker, Michelle A.,Arp, Christopher D.,&Koch, Benjamin J..(2009).Hydrologic control of nitrogen removal, storage, and export in a mountain stream.LIMNOLOGY AND OCEANOGRAPHY,54(6),2128-2142.
MLA Hall, Robert O., Jr.,et al."Hydrologic control of nitrogen removal, storage, and export in a mountain stream".LIMNOLOGY AND OCEANOGRAPHY 54.6(2009):2128-2142.
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