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Denitrification in bottomland hardwood wetland soils of the Cache River

Wetlands

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Abstract

Denitrification rates were quantified in bottomland hardwood wetland soils of the Cache River. N15 labeled nitrate was added to columns containing wetland soils and river water. Over 40 days, nitrate-N in floodwater (approximately 9 mg N L-1) decreased by between 82% and 59%, which gave estimates of N export from the water column of between 11.5 mg N m-2 day-1 and 7.5 mg N m-2 day-1. These values correlated directly with organic content of surface sediment, which included forest litter. Added glucose doubled rates of nitrate loss in these soils, which indicated that the process was carbon limited. Nitrification occurring simultaneously with denitrification was determined using isotopic dilution techniques. Contributions of nitrate to water from nitrification were estimated at between 5% and 12% of the total nitrate reduced. Rates of nitrogen transformation in these forest soils were likely limited by available soil carbon from tree litter and perhaps canopy leachate, rather than by nitrate concentration in inflowing floodwater.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Denitrification in bottomland hardwood wetland soils of the Cache River
Series title:
Wetlands
Volume
16
Issue:
3
Year Published:
1996
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Wetlands
First page:
309
Last page:
320
Number of Pages:
12