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Christopher T. Green, Barbara A. Bekins, Stephen J. Kalkhoff, Robert M. Hirsch, Lixia Liao and Kimberlee K. Barnes Decadal surface water quality trends under variable climate, land use, and hydrogeochemical setting in Iowa, USA Water Resources Research 50

Article first published online: 19 MAR 2014 | DOI: 10.1002/2013WR014829

Key Points

  • Weighted regression reveals N concentration trends independent of flow variations
  • Flow-normalized N concentrations decreased in Iowa Rivers from 2000 to 2012
  • Trends resulted from extreme flows interacting with hydrogeochemistry and land use

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