Variable nitrate concentration–discharge relationships in a forested watershed

Jonathan M. Duncan, Lawrence E. Band, Peter M. Groffman

Research output: Contribution to journalArticlepeer-review

48 Scopus citations


The relationship between solute concentrations and discharge can inform an integrated understanding of hydrological and biogeochemical processes at watershed scales. Recent work from multiple catchments has shown that there is typically little variation in concentration relative to large variations in discharge. This pattern has been described as chemostatic behavior. Pond Branch, a forested headwater catchment in Maryland, has been monitored for stream nitrate (NO3 ) concentrations at weekly intervals for 14 years. In the growing season and autumn of 2011 a high-frequency optical NO3 sensor was used to supplement the long-term weekly data. In this watershed, long-term weekly data show that NO3 concentrations decrease with increasing discharge whereas 6 months of 15-minute sensor observed concentrations reveal a more chemostatic behavior. High-frequency NO3 concentrations from the sensor collected during different storm events reveal variable concentration–discharge patterns highlighting the importance of high resolution data and ecohydrological drivers in controlling solute export for biologically reactive solutes such as NO3 .

Original languageEnglish (US)
Pages (from-to)1817-1824
Number of pages8
JournalHydrological Processes
Issue number9
StatePublished - Apr 30 2017

All Science Journal Classification (ASJC) codes

  • Water Science and Technology


Dive into the research topics of 'Variable nitrate concentration–discharge relationships in a forested watershed'. Together they form a unique fingerprint.

Cite this