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Nitrogen and phosphorus discharge from small agricultural catchments predicted from land use and hydroclimate

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  • Pärn, Jaan
  • Henine, Hocine
  • Kasak, Kuno
  • Kauer, Karin
  • Sohar, Kristina
  • Tournebize, Julien
  • Uuemaa, Evelyn
  • Välik, Kristiina
  • Mander, Ülo

Abstract

Excess nutrients cause eutrophication of freshwaters all over the world. Decision-support tools are needed to assess nutrient discharges from catchments. This paper used a 28-year nutrient-discharge, hydroclimate and land-use history of small rural catchments to calibrate a simple nitrogen (N) and phosphorus (P) runoff model. The N and P runoffs declined following the post-Soviet collapse of agriculture, and stabilised at low output during the 1990s and early 2000s. Introduction of the European Union Common Agricultural Policy (CAP) re-intensified the agriculture and somewhat rebounded the N and P discharges. Thus, the history of the catchment represents a broad range of land-management systems. Our objective was to explain annual nutrient runoffs from small rural catchments by five factors: hydroclimate, soil type, land-use type, fertilisation and the autumn soil-nutrient stock. Our model independently predicted the eight-year mean N and P losses from a test set of small agricultural catchments in Estonia. This shows the impact of political decisions on agricultural contamination of waters. We can suggest our robust model as a decision-making tool for land-use management in small agricultural catchments.

Suggested Citation

  • Pärn, Jaan & Henine, Hocine & Kasak, Kuno & Kauer, Karin & Sohar, Kristina & Tournebize, Julien & Uuemaa, Evelyn & Välik, Kristiina & Mander, Ülo, 2018. "Nitrogen and phosphorus discharge from small agricultural catchments predicted from land use and hydroclimate," Land Use Policy, Elsevier, vol. 75(C), pages 260-268.
    • Handle: RePEc:eee:lauspo:v:75:y:2018:i:c:p:260-268
    DOI: 10.1016/j.landusepol.2018.03.048
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    References listed on IDEAS

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    1. Ferrant, Sylvain & Durand, Patrick & Justes, Eric & Probst, Jean-Luc & Sanchez-Perez, José-Miguel, 2013. "Simulating the long term impact of nitrate mitigation scenarios in a pilot study basin," Agricultural Water Management, Elsevier, vol. 124(C), pages 85-96.
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