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Biogeochemistry

, Volume 125, Issue 1, pp 65–79 | Cite as

Quantifying ambient nitrogen uptake and functional relationships of uptake versus concentration in streams: a comparison of stable isotope, pulse, and plateau approaches

  • Matt T. TrentmanEmail author
  • Walter K. Dodds
  • Jane S. Fencl
  • Kayla Gerber
  • Jay Guarneri
  • Sean M. Hitchman
  • Zach Peterson
  • Janine Rüegg
Article

Abstract

Nutrient releases and spiraling metrics are frequently used to quantify the downstream transport of nutrients and to better understand the effects of anthropogenic inputs to downstream waters. Ambient uptake rates in streams can be measured through stable isotope enrichments, while pulse and plateau additions can estimate such rates via extrapolation and modeling techniques, respectively. Data from these releases can be used to estimate ambient uptake rates from nutrient additions and possibly determine the functional relationships between nutrient concentrations and uptake rates. Here, we compared estimated ambient rates calculated from established pulse and plateau approaches, results obtained from new modeling approaches, and rates at ambient concentrations from stable isotope enrichments. Comparative releases of NH4Cl and 15NH4Cl were conducted in four experimental reaches across the grassland Kings Creek and urban Campus Creek, KS. Nutrient uptake was predominantly linear with increasing ammonium. Estimated ambient uptake rates varied among sites, release methods, and data analysis approaches. However, plateau ambient rates from new modeling approaches matched closely with measured ambient rates from isotope enrichments at three sites, suggesting that modeled plateau data may be best for a first look at determining nutrient uptake rates at an individual site. Limitations and benefits of each approach vary; however, baseflow discharge may be a key driver when choosing a method. If possible, multiple methods should be attempted at each location and under each novel set of conditions to determine the best approach prior to designing and implementing a more extensive series of measurements.

Keywords

Nutrient spiraling TASCC Uptake length Ammonium uptake 

Notes

Acknowledgments

We thank the NSF Macrosystems and Konza LTER programs for support. We thank Lauren Koenig for reviewing the manuscript and providing some important ideas and Nate Cathcart for help with fieldwork. Two anonymous reviewers provided helpful suggestions to improve the manuscript. This is contribution number 15-437-J from the Kansas Agricultural Experiment Station.

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  1. 1.Division of BiologyKansas State UniversityManhattanUSA

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