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- Title
Phosphate retention in an agricultural stream using experimental additions of phosphate.
- Authors
M. L. Macrae; M. C. English; S. L. Schiff; M. A. Stone
- Abstract
In-stream experiments involving additions of phosphate were conducted to determine the soluble reactive phosphorus (SRP) retention potential of a perennial first-order stream that drains a 2·7 km2 agricultural catchment in southern Ontario. SRP retention was determined in relation to highly elevated SRP concentrations under low flow conditions. Point source treatments of phosphate were added to three reaches of this stream during two time periods when baseline SRP concentrations were notably different (early summer and early autumn). The reaches selected varied with respect to streambed shape and gradient, direction of groundwater flow, and channel vegetation type and density. One of the three experimental stream reaches was dredged between the two sampling periods, so that all vegetation and the top 25 cm of sediments were removed. SRP retention in the stream ranged from 0·8 to 24·1 µg m-2 s-1. Dredging the stream sediments did not alter the ability of the stream to remove SRP from the water column. SRP retention over the experimental reaches was generally 510% of the elevated concentration (0·74·2 mg l-1, a factor of 853 above pre-experiment conditions), although low-flow conditions in the stream were conducive to retention by stream sediments. Copyright © 2003 John Wiley & Sons, Ltd.
- Subjects
GROUNDWATER flow; RIVER sediments; GROUNDWATER; HYDROGEOLOGY
- Publication
Hydrological Processes, 2003, Vol 17, Issue 18, p3649
- ISSN
0885-6087
- Publication type
Article
- DOI
10.1002/hyp.1356