Publication Details

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

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

Year Published

2018

Publication

Geophysical Research Letters

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.

Keywords

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

Citation

Corman, J. R.; Bertolet, B. L.; Casson, N. J.; Sebestyen, S. D.; Kolka, R. K.; Stanley, E. H. 2018. Nitrogen and Phosphorus Loads to Temperate Seepage Lakes Associated With Allochthonous Dissolved Organic Carbon Loads. Geophysical Research Letters. 45(11): 5481-5490. https://doi.org/10.1029/2018GL077219.

Last updated on: February 20, 2019