This article is a U.S. Government work and is in the public domain in the U.S.A.
Seasonal variation in nutrient retention during inundation of a short-hydroperiod floodplain†
Article first published online: 27 JUL 2007
This article is a U.S. Government work and is in the public domain in the U.S.A. Published in 2007 by John Wiley & Sons, Ltd.
River Research and Applications
Volume 23, Issue 10, pages 1088–1101, December 2007
How to Cite
Noe, G. B. and Hupp, C. R. (2007), Seasonal variation in nutrient retention during inundation of a short-hydroperiod floodplain. River Res. Applic., 23: 1088–1101. doi: 10.1002/rra.1035
- Issue published online: 28 NOV 2007
- Article first published online: 27 JUL 2007
- Manuscript Accepted: 5 MAY 2007
- Manuscript Revised: 3 SEP 2006
- Manuscript Received: 5 JUL 2006
- USGS Chesapeake Bay Priority Ecosystem Science Program
- USGS National Research Program
Floodplains are generally considered to be important locations for nutrient retention or inorganic-to-organic nutrient conversions in riverine ecosystems. However, little is known about nutrient processing in short-hydroperiod floodplains or seasonal variation in floodplain nutrient retention. Therefore, we quantified the net uptake, release or transformation of nitrogen (N), phosphorus (P) and suspended sediment species during brief periods (1–2 days) of overbank flooding through a 250-m floodplain flowpath on the fourth-order Mattawoman Creek, Maryland U.S.A. Sampling occurred during a winter, two spring and a summer flood in this largely forested watershed with low nutrient and sediment loading. Concentrations of NO increased significantly in surface water flowing over the floodplain in three of the four floods, suggesting the floodplain was a source of NO. The upper portion of the floodplain flowpath consistently exported NH, most likely due to the hyporheic flushing of floodplain soil NH, which was then likely nitrified to NO in floodwaters. The floodplain was a sink for particulate organic P (POP) during two floods and particulate organic N and inorganic suspended sediment (ISS) during one flood. Large releases of all dissolved inorganic N and P species occurred following a snowmelt and subsequent cold winter flood. Although there was little consistency in most patterns of nutrient processing among the different floods, this floodplain, characterized by brief inundation, low residence time and low nutrient loading, behaved oppositely from the conceptual model for most floodplains in that it generally exported inorganic nutrients and imported organic nutrients. Published in 2007 by John Wiley & Sons, Ltd.