Nitrogen fluxes from the landscape are controlled by net anthropogenic nitrogen inputs and by climate

Nitrogen fluxes from the landscape are controlled by net anthropogenic nitrogen inputs and by climate. Howarth, R., Swaney, D., Billen, G., Garnier, J., Hong, B., Humborg, C., Johnes, P., M̈orth, C.M., & Marino, R. Frontiers in Ecology and the Environment, 10(1):37--43, February, 2012.

Paper doi abstract bibtex

The flux of nitrogen (N) to coastal marine ecosystems is strongly correlated with the “net anthropogenic nitrogen inputs” (NANI) to the landscape across 154 watersheds, ranging in size from 16 km2 to 279 000 km2, in the US and Europe. When NANI values are greater than 1070 kg N km–2 yr–1, an average of 25% of the NANI is exported from those watersheds in rivers. Our analysis suggests a possible threshold at lower NANI levels, with a smaller fraction exported when NANI values are below 1070 kg N km–2 yr–1. Synthetic fertilizer is the largest component of NANI in many watersheds, but other inputs also contribute substantially to the N fluxes; in some regions, atmospheric deposition of N is the major component. The flux of N to coastal areas is controlled in part by climate, and a higher percentage of NANI is exported in rivers, from watersheds that have higher freshwater discharge.

@article{ Howarth2012,
  abstract = {The flux of nitrogen (N) to coastal marine ecosystems is strongly correlated with the “net anthropogenic nitrogen inputs” (NANI) to the landscape across 154 watersheds, ranging in size from 16 km2 to 279 000 km2, in the US and Europe. When NANI values are greater than 1070 kg N km–2 yr–1, an average of 25% of the NANI is exported from those watersheds in rivers. Our analysis suggests a possible threshold at lower NANI levels, with a smaller fraction exported when NANI values are below 1070 kg N km–2 yr–1. Synthetic fertilizer is the largest component of NANI in many watersheds, but other inputs also contribute substantially to the N fluxes; in some regions, atmospheric deposition of N is the major component. The flux of N to coastal areas is controlled in part by climate, and a higher percentage of NANI is exported in rivers, from watersheds that have higher freshwater discharge.},
  author = {Howarth, RW and Swaney, Dennis and Billen, Gilles and Garnier, Josette and Hong, Bongghi and Humborg, Christoph and Johnes, Penny and M̈{o}rth, Carl-Magnus and Marino, Roxanne},
  doi = {10.1890/100178},
  file = {:E$\backslash$:/Users/Melanie/AA-PROJECTS/All_Journal_Articles/MendeleyAuto//Howarth et al._2012_Frontiers in Ecology and the Environment.pdf:pdf},
  issn = {1540-9295},
  journal = {Frontiers in Ecology and the Environment},
  month = {February},
  number = {1},
  pages = {37--43},
  title = {{Nitrogen fluxes from the landscape are controlled by net anthropogenic nitrogen inputs and by climate}},
  url = {http://dx.doi.org/10.1890/100178},
  volume = {10},
  year = {2012}
}

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When NANI values are greater than 1070 kg N km–2 yr–1, an average of 25% of the NANI is exported from those watersheds in rivers. Our analysis suggests a possible threshold at lower NANI levels, with a smaller fraction exported when NANI values are below 1070 kg N km–2 yr–1. Synthetic fertilizer is the largest component of NANI in many watersheds, but other inputs also contribute substantially to the N fluxes; in some regions, atmospheric deposition of N is the major component. The flux of N to coastal areas is controlled in part by climate, and a higher percentage of NANI is exported in rivers, from watersheds that have higher freshwater discharge.},\n author = {Howarth, RW and Swaney, Dennis and Billen, Gilles and Garnier, Josette and Hong, Bongghi and Humborg, Christoph and Johnes, Penny and M̈{o}rth, Carl-Magnus and Marino, Roxanne},\n doi = {10.1890/100178},\n file = {:E$\\backslash$:/Users/Melanie/AA-PROJECTS/All_Journal_Articles/MendeleyAuto//Howarth et al._2012_Frontiers in Ecology and the Environment.pdf:pdf},\n issn = {1540-9295},\n journal = {Frontiers in Ecology and the Environment},\n month = {February},\n number = {1},\n pages = {37--43},\n title = {{Nitrogen fluxes from the landscape are controlled by net anthropogenic nitrogen inputs and by climate}},\n url = {http://dx.doi.org/10.1890/100178},\n volume = {10},\n year = {2012}\n}</pre>\n</div>\n\n\n<div class=\"well well-small bibbase\" id=\"abstract_Howarth2012\"\n style=\"display:none\">\n The flux of nitrogen (N) to coastal marine ecosystems is strongly correlated with the “net anthropogenic nitrogen inputs” (NANI) to the landscape across 154 watersheds, ranging in size from 16 km2 to 279 000 km2, in the US and Europe. When NANI values are greater than 1070 kg N km–2 yr–1, an average of 25% of the NANI is exported from those watersheds in rivers. Our analysis suggests a possible threshold at lower NANI levels, with a smaller fraction exported when NANI values are below 1070 kg N km–2 yr–1. Synthetic fertilizer is the largest component of NANI in many watersheds, but other inputs also contribute substantially to the N fluxes; in some regions, atmospheric deposition of N is the major component. The flux of N to coastal areas is controlled in part by climate, and a higher percentage of NANI is exported in rivers, from watersheds that have higher freshwater discharge.\n</div>\n\n\n</div>\n","downloads":0,"abstract":"The flux of nitrogen (N) to coastal marine ecosystems is strongly correlated with the “net anthropogenic nitrogen inputs” (NANI) to the landscape across 154 watersheds, ranging in size from 16 km2 to 279 000 km2, in the US and Europe. 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