Spatial and temporal trends in nitrate concentrations in the River Derwent, North Yorkshire, and its need for NVZ status

The Science of the Total Environment
Ishaq A MianMalcolm S Cresser

Abstract

Long-term spatial and temporal variations in nitrate-N concentrations along the River Derwent have been examined using Environment Agency data to investigate the relative importance of impacts of atmospheric N deposition, land use, and changes in management. Where moorland and rough grazing dominate upstream of Forge Valley and Malton, over the 20 years since 1988 mean nitrate-N concentrations were initially increasing significantly, but are now levelling off, with peaks at ca. 4.5 mg Nl(-1). As expected in a catchment in a nitrate vulnerable zone (NVZ), more agricultural land use increases mean nitrate concentrations and the occurrence of distinct winter maxima, though the latter have become markedly less pronounced since 2001. It is suggested that this improvement is a combined effect of imposition of NVZ designation in the lower reaches in 2002, animal number declines associated with the Foot & Mouth outbreak in the region in 2001, and the impact of farmers' responses to increasing fertilizer prices and to beneficial pollutant mineral N inputs from the atmosphere. Minima in nitrate-N concentrations in summer have become much less pronounced over the past decade and are typically ca. 60% higher in concentration than a decade ...Continue Reading

References

May 24, 2005·The Science of the Total Environment·Helen P JarvieRichard M Acornley
Apr 19, 2006·The Science of the Total Environment·Colin NealHeather Wickham

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Citations

Jan 31, 2014·Environmental Monitoring and Assessment·Hongmei BuYuan Zhang
Nov 19, 2013·The Science of the Total Environment·Alina PremrovKarl G Richards
Jun 3, 2017·Royal Society Open Science·Melanie Tietje, Mark-Oliver Rödel
Aug 17, 2011·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Ben CollenNick J B Isaac

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