Environmental Monitoring and Assessment

, Volume 186, Issue 12, pp 8981–8995 | Cite as

Water quality status and trends in agriculture-dominated headwaters; a national monitoring network for assessing the effectiveness of national and European manure legislation in The Netherlands

  • J. C. Rozemeijer
  • J. Klein
  • H. P. Broers
  • T. P. van Tol-Leenders
  • B. van der Grift
Article

Abstract

Large nutrient losses to groundwater and surface waters are a major drawback of the highly productive agricultural sector in The Netherlands. The resulting high nutrient concentrations in water resources threaten their ecological, industrial, and recreational functions. To mitigate eutrophication problems, legislation on nutrient application in agriculture was enforced in 1986 in The Netherlands. The objective of this study was to evaluate this manure policy by assessing the water quality status and trends in agriculture-dominated headwaters. We used datasets from 5 agricultural test catchments and from 167 existing monitoring locations in agricultural headwaters. Trend analysis for these locations showed a fast reduction of nutrient concentrations after the enforcement of the manure legislation (median slopes of −0.55 mg/l per decade for total nitrogen (N-tot) and −0.020 mg/l per decade for total phosphorus (P-tot)). Still, up to 76 % of the selected locations currently do not comply with either the environmental quality standards (EQSs) for nitrogen (N-tot) or phosphorus (P-tot). This indicates that further improvement of agricultural water quality is needed. We observed that weather-related variations in nutrient concentrations strongly influence the compliance testing results, both for individual locations and for the aggregated results at the national scale. Another important finding is that testing compliance for nutrients based on summer average concentrations may underestimate the agricultural impact on ecosystem health. The focus on summer concentrations does not account for the environmental impact of high winter loads from agricultural headwaters towards downstream water bodies.

Keywords

Monitoring Water quality Agriculture Nutrients Nitrogen Phosphorus 

Notes

Acknowledgments

The authors acknowledge The Dutch Ministry of Infrastructure and the Environment for funding this research. Douwe Jonkers of the Dutch Ministry of Infrastructure and the Environment and Marianne Mul of the Water Board Union are acknowledged for their cooperation. The authors are grateful for all Water Board employees who provided the data, gave feedback, and answered all our questions. And finally, we acknowledge all field samplers and analysts who contributed to the datasets.

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • J. C. Rozemeijer
    • 1
  • J. Klein
    • 1
  • H. P. Broers
    • 1
    • 2
    • 3
  • T. P. van Tol-Leenders
    • 4
  • B. van der Grift
    • 1
    • 5
  1. 1.DeltaresUtrechtThe Netherlands
  2. 2.TNO Geological Survey of the NetherlandsUtrechtThe Netherlands
  3. 3.Critical Zone Hydrology GroupVrije Universiteit AmsterdamAmsterdamThe Netherlands
  4. 4.AlterraWageningen University and Research CentreWageningenThe Netherlands
  5. 5.Department of Innovation, Environmental and Energy SciencesUtrecht UniversityUtrechtNetherlands

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