NDLI: Subsurface N Retention in Two Mediterranean Wetland-Streams Affected by Agricultural Runoff

Content Provider	Springer Nature Link
Author	García García, V. Gómez, R. Vidal Abarca, M. R. Suárez, M. L.
Copyright Year	2013
Abstract	We estimated subsurface nitrogen (N) retention efficiency of two Mediterranean wetland-streams affected by agricultural runoff, and analysed the influence of hydrology and physicochemical factors such as N load. Subsurface N retention efficiency was high and greater than the surface N retention quantified in a previous study. The studied wetlands clearly functioned as nitrate-N (NO$_{3}$ $^{−}$-N) sinks (96.5 % and 89.8 %), which was the dominant N form. They were usually total organic-N (TON-N) sinks (49.9 % and 21.6 %), but were ammonium-N (NH$_{4}$ $^{+}$-N) sinks/sources. Water temperature was an important predictor of NO$_{3}$ $^{−}$-N retention efficiency, accounting for 59 % and 34 % of explained variance for both wetlands, respectively. This result highlights the importance of biological processes in NO$_{3}$ $^{−}$-N retention. The studied wetlands did not present “saturation symptoms” at high inflow NO$_{3}$ $^{−}$-N concentrations (40 mg l$^{−1}$). These small slope wetlands can be compared to riparian wetlands in terms of NO$_{3}$ $^{−}$-N retention efficiency. The contribution of the subsurface component to the wetland N mass removal rate was low (0.01 % and 0.05 %). Both wetlands removed an average of 1.1 and 6.2 μg of NO$_{3}$ $^{−}$-N m$^{−2}$ h$^{−1}$.
Starting Page	597
Ending Page	608
Page Count	12
File Format	PDF
ISSN	02775212
Journal	Wetlands
Volume Number	33
Issue Number	4
e-ISSN	19436246
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-04-10
Publisher Institution	Society of Wetland Scientists
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Subsurface water Nitrogen retention Slope wetlands Agricultural catchments Semi-arid zones Mediterranean region Freshwater & Marine Ecology Environmental Management Ecology Hydrogeology Coastal Sciences Landscape Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Environmental Chemistry

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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