Managing diffuse phosphorus at the source versus at the sink

Katrina A. Macintosh, Brooke K. Mayer, Richard W. McDowell, Stephen M. Powers, Lawrence A. Baker, Treavor H. Boyer, Bruce E. Rittmann

Research output: Contribution to journalReview articlepeer-review

33 Citations (Scopus)
130 Downloads (Pure)

Abstract

Judicious phosphorus (P) management is a global grand challenge and critical to achieving and maintaining water quality objectives while maintaining food production. The management of point sources has been successful in lowering P inputs to aquatic environments, but more difficult is reducing P discharges associated with diffuse sources, such as non-point runoff from agriculture and urban landscapes, as well as P accumulated in soils and sediments. Strategies for effective diffuse-P management are imperative. Many options are currently available, and the most cost-effective and practical choice depends on the local situation. This critical review describes how the metrics of P quantity in kg ha-1 yr-1 and P form can influence decision-making and implementation of diffuse-P management strategies. Quantifying the total available pool of P, and its form, in a system is necessary to inform effective decision-making. The review draws upon a number of ‘current practice’ case studies that span agriculture, cities, and aquatic sectors. These diverse examples from around the world highlight different diffuse-P management approaches, delivered at the source in the catchment watershed or at the aquatic sink. They underscore workable options for achieving water quality improvement and wider P sustainability. The diffuse-P management options discussed in this critical review are transferable to other jurisdictions at the global scale. We demonstrate that P quantity is typically highest and most concentrated at the source, particularly at farm scale. The most cost-effective and practically implementable diffuse-P management options are, therefore, to reduce P use, conserve P, and mitigate P loss at the source. Sequestering and removing P from aquatic sinks involves increasing cost, but is sometimes the most effective choice. Recovery of diffuse-P, while expensive, offers opportunity for the circular economy.
Original languageEnglish
Pages (from-to)11995-12009
Number of pages15
JournalEnvironmental Science and Technology
Volume52
Issue number21
Early online date24 Sep 2018
DOIs
Publication statusPublished - 06 Nov 2018

Keywords

  • Phosphorus
  • Source
  • Sink
  • Diffuse
  • Management
  • Water

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