NDLI: Macrophyte presence is an indicator of enhanced denitrification and nitrification in sediments of a temperate restored agricultural stream

Content Provider	Springer Nature Link
Author	Forshay, Kenneth J. Dodson, Stanley I.
Copyright Year	2011
Abstract	Stream macrophytes are often removed with their sediments to deepen stream channels, stabilize channel banks, or provide habitat for target species. These sediments may support enhanced nitrogen processing. To evaluate sediment nitrogen processing, identify seasonal patterns, and assess sediment processes relative to stream load, we measured denitrification and nitrification rates in a restored third- to fourth-order agricultural stream, Black Earth Creek, Wisconsin, and estimated processing over a 10 km reach. Our results show that sediments with submerged and emergent macrophytes (e.g., Potomageton spp. and Phalaris arudinacea) support greater denitrification rates than bare sediments (1.12 μmol N g−1 h−1 vs. 0.29). Sediments with macrophytes were not carbon limited and organic matter fraction was weakly correlated to denitrification. The highest denitrification potential occurred in macrophyte beds (5.19 μmol N g−1 h−1). Nitrification rates were greater in emergent beds than bare sediments (1.07 μg N ml−1day−1 vs. 0.35) with the greatest nitrification rates during the summer. Total denitrification removal in sediments with macrophytes was equivalent to 43% of the nitrate stream load (463.7 kg N day−1) during spring and nitrification in sediments with macrophytes was equivalent to 247% of summer ammonium load (3.5 kg N day−1). Although the in-channel connectivity to nitrogen rich water was limited, actual stream nitrogen loads could increase with removal of macrophytes. Macrophyte beds and supporting fringing wetted areas are important if nitrogen management is a concern for riparian stream restoration efforts.
Starting Page	21
Ending Page	34
Page Count	14
File Format	PDF
ISSN	00188158
Journal	Hydrobiologia
Volume Number	668
Issue Number	1
e-ISSN	15735117
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-02-24
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nitrate Ammonium Pollution Restoration Ecosystem services Macrophyte Denitrification Stream Nitrification Sediment Wet fringe Freshwater & Marine Ecology Zoology Ecology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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