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Long-term atmospheric carbon dioxide enrichment decreases soil phosphorus availability in a grazed temperate pasture

journal contribution
posted on 2024-06-21, 03:50 authored by Driss Touhami, Rich McDowellRich McDowell, Leo Condron, Mark Lieffering, Paul NewtonPaul Newton
Elevated atmospheric carbon dioxide (eCO2) associated with climate change increases plant production and soil nutrient transformations. However, changes in soil phosphorus (P) availability and dynamics are unclear. We used the long-term New Zealand Free Air CO2 Enrichment (FACE) experiment to quantify changes in P availability and soil P fractions as well as chemical and biological parameters in response to ambient and elevated CO2 (up to 500 ppm) concentrations. Results revealed that labile and moderately labile soil inorganic P decreased in response to eCO2, while organic P increased. Accumulation of organic P was related to enhanced biological activity, increased inputs of organic P from root detritus, and immobilization on reactive mineral surfaces. The findings of this study confirmed that elevated CO2 had a major impact on the dynamics and bioavailability of soil P under grazed pasture, which may be further impacted by continued climate change.

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

History

Publication date

2020-07-07

Language

  • English

Does this contain Māori information or data?

  • No

Journal title

Geoderma

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