Fate of 15N-nitrate in unplanted, planted and harvested riparian wetland soil microcosms

Riparian wetlands are important for the protection of river water quality in agricultural landscapes by intercepting and removing nutrients, such as nitrate (NO 3 −), in runoff. However, limited information is available on the relative importance of biological NO 3 − removal processes in these ecosy...

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Bibliographic Details
Published in:Ecological engineering 2002-10, Vol.19 (4), p.249-264
Main Authors: Matheson, F.E, Nguyen, M.L, Cooper, A.B, Burt, T.P, Bull, D.C
Format: Article
Language:English
Subjects:
Denitrification
Dissimilatory nitrate reduction to ammonium
Emergent vegetation
Immobilisation
Nitrogen
Pastoral landscape
Plant uptake
Retention
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Summary:Riparian wetlands are important for the protection of river water quality in agricultural landscapes by intercepting and removing nutrients, such as nitrate (NO 3 −), in runoff. However, limited information is available on the relative importance of biological NO 3 − removal processes in these ecosystems. In this study the fate of 15N-NO 3 − was investigated for 32 days in three types of wetland soil microcosm (unplanted, planted, and planted with shoot harvest) in order to identify the key processes responsible for NO 3 − removal, elucidate the role of the wetland plant and determine the effect of shoot harvest. 15N-NO 3 − solution (7.9 mg N l −1, 99 at.% 15N) was added to each microcosm at a rate of 0.5 μg N g −1 soil every 2 days. In both types of plant-inhabited microcosm, similar proportions of added 15N-NO 3 − were denitrified (61–63%), soil-immobilised (24–26%), plant-assimilated (11–15%) and reduced to ammonium (NH 4 +) (
ISSN:0925-8574
1872-6992
DOI:10.1016/S0925-8574(02)00093-9