Phosphate stable oxygen isotope variability within a temperate agricultural soil

A - Papers appearing in refereed journals

Granger, S. J., Harris, P., Peukert, S., Guo, R., Tamburini, F., Blackwell, M. S. A., Howden, N. J. K. and McGrath, S. P. 2017. Phosphate stable oxygen isotope variability within a temperate agricultural soil. Geoderma. 285 (1 January), pp. 64-75.

AuthorsGranger, S. J., Harris, P., Peukert, S., Guo, R., Tamburini, F., Blackwell, M. S. A., Howden, N. J. K. and McGrath, S. P.
Abstract

In this study, we conduct a spatial analysis of soil total phosphorus (TP), acid extractable phosphate (PO4) and the stable oxygen (O) isotope ratio within the PO4 molecule (δ18OPO4) from an intensively managed agricultural grassland site. Total P in the soil was found to range from 736 to 1952 mg P kg− 1, of which between 12 and 48% was extractable using a 1 M HCl (HClPO4) solution with the two variables exhibiting a strong positive correlation. The δ18OPO4 of the extracted PO4 ranged from 17.0 to 21.6‰ with a mean of 18.8‰ (± 0.8). While the spatial variability of Total P has been researched at various scales, this is the first study to assess the variability of soil δ18OPO4 at a field-scale resolution. We investigate whether or not δ18OPO4 variability has any significant relationship with: (i) itself with respect to spatial autocorrelation effects; and (ii) HClPO4, elevation and slope - both globally and locally. Results indicate that δ18OPO4 was not spatially autocorrelated; and that δ18OPO4 was only weakly related to HClPO4, elevation and slope, when considering the study field as a whole. Interestingly, the latter relationships appear to vary in strength locally. In particular, the δ18OPO4 to HClPO4 relationship may depend on the underlying soil class and/or on different field managements that had operated across an historical north-south field division of the study field, a division that had been removed four years prior to this study.

Keywordsphosphorus; grassland; spatial analysis; GW model; North Wyke farm platfom
Year of Publication2017
JournalGeoderma
Journal citation285 (1 January), pp. 64-75
Digital Object Identifier (DOI)doi:10.1016/j.geoderma.2016.09.020
Open accessPublished as ‘gold’ (paid) open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeSustainability
The North Wyke Farm Platform [2012-2017]
Optimisation of nutrients in soil-plant systems: Determining how phosphorus availability is regulated in soils
Publisher's version
Copyright license
CC BY
File Access Level
Open
Output statusPublished
Publication dates
Online28 Sep 2016
Publication process dates
Accepted21 Sep 2016
PublisherElsevier Science Bv
ISSN0016-7061

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