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Methods for assessing laterally-resolved distribution, speciation and bioavailability of phosphorus in soils

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Abstract

Supply of phosphorus (P) as an agricultural input depends on a limited mineral rock phosphate reserve, but inefficient use means this resource is not being used sustainably. Moreover, losses of P from historically accumulated soil reserves can cause substantial environmental harm. Development of sustainable P management will require optimization of P use efficiency, with this needing a better understanding of the distribution and chemical behaviour of P in soils, including both P applied as a fertilizer and native P. In this review, we discuss in-situ methods for microscopic mapping of P distribution, speciation and plant-available P fractions in soils, including scanning electron microscopy-based energy-dispersive X-ray spectroscopy, nanoscale secondary ion mass spectroscopy, X-ray fluorescence microscopy (and associated X-ray absorption spectroscopy), Raman and infrared spectroscopies, diffusive gradients in thin films coupled with laser ablation inductively coupled plasma mass spectrometry or colorimetry, and autoradiography. These methods can complement the traditional (bulk) methods for P analysis as well as deliver valuable information in their own right or in conjunction as part of an imaging cascade. We compare the merits and limitations of these techniques, which can serve to play a key role in answering questions about P behaviour in soil, from the microscopic to macroscopic scale, and provide some examples of how they may support researchers in their particular research.

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Abbreviations

SEM-EDS:

Scanning electron microscopy—energy dispersive x-ray spectroscopy

NanoSIMS:

Nanoscale secondary ion mass spectroscopy

XFM:

X-Ray Fluorescence Microscopy

µ-XAS:

Micro-X-ray absorption spectroscopy

IRM:

Infrared microspectroscopy

DGT:

Diffusive Gradients in Thin films

LA-ICP-MS:

Laser ablation inductively coupled plasma mass spectrometry

CID:

Computer imaging densitometry

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Acknowledgements

The authors thank Wantana Klysubun from the Synchrotron Light Research Institute (SLR), Thailand for review of an early version the manuscript. We thank Sander Bruun, Lachlan Casey, Carmen Hoeschen, Leslie Huang, Gregor Meyer, Jakob Santner, and Alix Vidal for assistance with generating and/or providing examples of analyses using SEM-EDS, lab-based XFM, NanoSIMS, LA-ICP-MS and colorimetry.

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The manuscript was written through contributions of all authors. All authors have given approval to the final version of the manuscript.

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Correspondence to Frederik J. T. van der Bom.

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The authors declare no conflicts of interest or competing interests exist.

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van der Bom, F.J.T., Kopittke, P.M., Raymond, N.S. et al. Methods for assessing laterally-resolved distribution, speciation and bioavailability of phosphorus in soils. Rev Environ Sci Biotechnol 21, 53–74 (2022). https://doi.org/10.1007/s11157-021-09602-z

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  • DOI: https://doi.org/10.1007/s11157-021-09602-z

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