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Temperature and Nitrogen Effects on Phosphorus Uptake by Agricultural Stream-Bed Sediments

journal contribution
posted on 2024-06-21, 03:50 authored by Rich McDowellRich McDowell, Kyle Elkin, Peter Kleinman
Climate change will likely increase the growing season, temperatures, and ratio of nitrogen (N) to phosphorus (P) loss from land to water. However, it is unknown how these factors influence P concentrations in streams. We sought to evaluate differences in biotic and abiotic processes affecting stream sediment P dynamics under different temperature and N-enrichment regimes. Analysis of sediment samples indicated that P uptake via abiotic processes was greater at 19 than at 26°C. The addition of N stimulated P uptake by the microbial biomass at 19°C, but microbial uptake was potentially inhibited at 26°C. Because microbial biomass is a temporary store of P, these data suggest that more P may be available with increasing temperatures during the growing season, especially under baseflow, implying that strategies to mitigate P losses from land to water should be strengthened to prevent potential water quality impairment.

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|Sources and Flows|Reasons for Water Quality Improvement

History

Publication date

2017-03-07

Language

  • English

Does this contain Māori information or data?

  • No

Journal title

Journal of Environmental Quality

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