Quantifying potential nitrogen removal by denitrification in stream sediments at a regional scale
M. E. Bartkow A B C and J. W. Udy AA Cooperative Research Centre for Freshwater Ecology, Centre for Riverine Landscapes, Griffith University, Nathan, Qld 4111, Australia.
B National Research Centre for Environmental Toxicology, University of Queensland, Coopers Plains, Qld 4108, Australia.
C Corresponding author. Email: m.bartkow@uq.edu.au
Marine and Freshwater Research 55(3) 309-315 https://doi.org/10.1071/MF04018
Submitted: 22 January 2004 Accepted: 27 February 2004 Published: 19 May 2004
Abstract
Potential denitrification rates were measured using the acetylene block method, in sediments collected from streams in the sub-tropical, south-east Queensland region of Australia. Our aim was to estimate how much nitrogen could be removed from lotic systems by denitrification at the regional scale. Denitrification measured at 65 sites in August and September from a catchment of 22700 km2 was extrapolated to all streams and rivers in the region based on the sediment area available for denitrification. Denitrification rates ranged between 4 and 950 μmol N m–2 h–1, with most sites having rates below 150 μmol N m–2 h–1. Based on these results, the current study estimates that a total of 305 t of nitrogen could be denitrified per year from all streams and rivers in the region, representing 6% of the total annual nitrogen load from surrounding land use. During baseflow conditions, when nitrogen loads to streams are low, the proportion of nitrogen removed through denitrification would be substantially higher, in some cases removing 100% of the nitrogen load. It is proposed that denitrification is an important process maintaining low concentrations of dissolved inorganic nitrogen under baseflow conditions and is therefore likely to enhance nitrogen limitation of primary production in this region.
Extra keywords: acetylene block technique, algal growth regulation, bioavailable nitrogen.
Acknowledgments
We would like to thank Mark Kennard and Mick Smith of Griffith University and the South East Queensland Water Quality Management Strategy for information and data on study sites; Donna Fyfe, Joanne Clapcott, Christie Fellows, and Sam McMillan for field and laboratory assistance. Queensland Health provides funding for The National Research Centre for Environmental Toxicology.
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