Nitrogen and Phosphorus Loads to Temperate Seepage Lakes Associated With Allochthonous Dissolved Organic Carbon Loads

J. R. Corman, B. L. Bertolet, N. J. Casson, S. D. Sebestyen, R. K. Kolka, E. H. Stanley

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Terrestrial loads of dissolved organic matter (DOM) have increased in recent years in many north temperate lakes. While much of the focus on the “browning” phenomena has been on its consequences for carbon cycling, much less is known about how it influences nutrient loading to lakes. We characterize potential loads of nitrogen and phosphorus to seepage lakes in northern Wisconsin, USA, based on a laboratory soil leaching experiment and a model that includes landscape cover and watershed area. In these seepage lakes, nutrient concentrations are positively correlated with dissolved organic carbon concentrations (nitrogen: r = 0.68, phosphorus: r = 0.54). Using long-term records of browning, we found that dissolved organic matter-associated nutrient loadings may have resulted in substantial increases in nitrogen and phosphorus in seepage lakes and could account for currently observed nutrient concentrations in the lake. “Silent” nutrient loadings to brown-water lakes may lead to future water-quality concerns.

Original languageEnglish (US)
Pages (from-to)5481-5490
Number of pages10
JournalGeophysical Research Letters
Volume45
Issue number11
DOIs
StatePublished - Jun 16 2018
Externally publishedYes

Keywords

  • allochthonous
  • brownification
  • chromophoric DOC
  • nutrient cycling
  • phosphorus
  • seepage lakes

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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