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Biogeosciences An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/bg-2020-130
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2020-130
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  05 May 2020

05 May 2020

Review status
A revised version of this preprint was accepted for the journal BG and is expected to appear here in due course.

Reviews and Syntheses: Ironing Out Wrinkles in the Soil Phosphorus Cycling Paradigm

Curt A. McConnell1, Jason P. Kaye2, and Armen R. Kemanian1 Curt A. McConnell et al.
  • 1Department of Plant Science, The Pennsylvania State University, University Park, PA, 16802, USA
  • 2Department of Ecosystem Science and Management, The Pennsylvania State University, University Park, PA, 16802, USA

Abstract. Soil phosphorus (P) management remains a critical challenge for agriculture worldwide, and yet we are still unable to predict soil P dynamics as confidently as that of carbon (C) or nitrogen (N). This is due to both the complexity of inorganic P (Pi) and organic P (Po) cycling and the methodological constraints that have limited our ability to trace P dynamics in the soil-plant system. In this review we describe the challenges to building parsimonious, accurate, and useful P models and to explore the potential of some new techniques to advance modeling efforts. To advance our understanding and modeling of P biogeochemistry, research efforts should focus on the following: 1) update the McGill and Cole (1981) model of Po mineralization by clarifying the role and prevalence of “biochemical” and “biological” Po mineralization which we hypothesize are not mutually exclusive and may co-occur along a continuum of Po substrate stoichiometry; 2) further understand the dynamics of phytate, a 6-C compound that can regulate the poorly understood stoichiometry of soil P; 3) explore the effects of C and Po saturation on P sorption and Po mineralization; and 4) resolve discrepancies between hypotheses about P cycling and the methods used to test these hypotheses.

Curt A. McConnell et al.

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Curt A. McConnell et al.

Curt A. McConnell et al.

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Latest update: 27 Sep 2020
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Short summary
Soil phosphorus (P) management is a critical challenge for agriculture worldwide; yet, simulation models of soil P processes lag that of other essential nutrients. In this review we identify hindrances to measuring and modeling soil P pools and fluxes. We highlight the need to clarify biological and mineral interactions by defining P pools explicitly and using evolving techniques such as tracing P in phosphates using oxygen isotopes.
Soil phosphorus (P) management is a critical challenge for agriculture worldwide; yet, simulation...
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