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Why are median phosphorus concentrations improving in New Zealand streams and rivers?

journal contribution
posted on 2024-06-21, 03:50 authored by Rich McDowellRich McDowell, Michael Hedley, Peter PletnyakovPeter Pletnyakov, Clint Rissman, Warwick Catto, Wes Patrick
Between 2004 and 2013 phosphorus concentrations decreased at 65% of the 304 sites monitored. Our research found the most probable causes of improvement were that strategies were mitigating P loss from land, guidelines were directing where to best use strategies, and policy instruments were including P management. We found little evidence that this improvement was caused by a decrease in fertilizer use or change in fertilizer form, or that greater nitrate loads were assimilating P from groundwater or sediments.

Funding

Funded by the New Zealand Ministry for Business, Innovation and Employment's Our Land and Water National Science Challenge (Toitū te Whenua, Toiora te Wai) as part of project Phosphorus Best Practice|Reasons for Water Quality Improvement

History

Publication date

2019-02-07

Language

  • English

Does this contain Māori information or data?

  • No

Journal title

Journal of the Royal Society of New Zealand

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