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Anthropogenic increases of catchment nitrogen and phosphorus loads in New Zealand

journal contribution
posted on 2024-06-21, 03:49 authored by Ton Snelder, Scott Larned, Rich McDowellRich McDowell
Spatial regression models were used to predict yields of nitrogen (N) and phosphorus (P) discharged from catchments throughout New Zealand. The models were derived using loads (kg yr‚àí1) of TN, NO3-N, TP and DRP calculated for 592 river water quality monitoring sites. Anthropogenic increases in loads of TN, NO3-N, TP and DRP exported to the ocean were 74%, 159%, 48% and 18%, respectively. Increases in loads varied considerably at smaller scales, between 4- and 26-fold for N and 6- to 9-fold for P. Predictions of yields and loads have utility in the development of strategies to manage nutrients.

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 Land Use Suitability|Assessing Contaminants with Stream Order

History

Publication date

2017-10-07

Language

  • English

Does this contain Māori information or data?

  • No

Journal title

New Zealand Journal of Marine and Freshwater Research

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