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Biogeochemistry

, Volume 142, Issue 1, pp 155–174 | Cite as

Differential influence of landscape features and climate on nitrogen and phosphorus transport throughout the watershed

  • Jean-Olivier GoyetteEmail author
  • Elena M. Bennett
  • Roxane Maranger
Article

Abstract

Anthropogenic activities have led to increased transfers of nitrogen (N) and phosphorus (P) to surface waters where changes in the absolute amounts of N and P delivery, and in N:P ratios, threaten water quality. While models of riverine fluxes are increasingly good at predicting total annual nutrient loads, our understanding of which features of a watershed differentially affect N and P transport downstream is still limited. In this study, we used linear mixed models to quantify the relative transport of N and P through different landscape and limnoscape compartments (e.g. hill slopes, lakes, reservoirs,) under a variety of climate regimes over 26 years in 18 watersheds of the St. Lawrence Basin. Water retention capacity and precipitation patterns were the features that most strongly influenced nutrient export from land to water, where P was preferentially retained in the landscape over N when water retention capacity was highest. Lakes and reservoirs also emerged as features that influenced nutrient fluxes, where lakes preferentially retain more P over N and reservoirs tended to export N. Factors that favor erosion, such as flashiness of precipitation and land-use change also alter N:P ratios in receiving waters, largely by mobilizing legacy sources of P.

Keywords

Watershed Nitrogen Phosphorus Dams Lakes Nutrient fluxes Stoichiometry 

Notes

Acknowledgements

We thank JF Lapierre, M Botrel, N Fortin St Gelais and other members of the Maranger lab for helpful suggestions. We thank two anonymous reviewers for helpful comments that improved the manuscript. This research was supported by Fonds de Recherche Nature et Technologie du Québec (FQRNT) and Groupe de Recherche Interuniversitaire en Limnologie et environnement aquatique (GRIL) student scholarship Grants to JOG and a National Science and Engineering Research Council of Canada (NSERC) Discovery Grant to RM.

Supplementary material

10533_2018_526_MOESM1_ESM.pdf (1.1 mb)
Supplementary material 1 (PDF 1166 kb)

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Authors and Affiliations

  1. 1.Groupe de Recherche Interuniversitaire en Limnologie et en environnement aquatique (GRIL), Département de Sciences BiologiquesUniversité de MontréalMontrealCanada
  2. 2.Department of Natural Resource Sciences and McGill School of EnvironmentMcGill UniversityMontrealCanada

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