Changes of oxygen isotope values of soil P pools associated with changes in soil pH

A - Papers appearing in refereed journals

Pfahler, V., Macdonald, A. J., Mead, A., Smith, A. C., Tamburini, F., Blackwell, M. S. A. and Granger, S. J. 2020. Changes of oxygen isotope values of soil P pools associated with changes in soil pH. Scientific Reports. 10 (2065).

AuthorsPfahler, V., Macdonald, A. J., Mead, A., Smith, A. C., Tamburini, F., Blackwell, M. S. A. and Granger, S. J.
Abstract

Field data about the effect of soil pH on phosphorus (P) cycling is limited. A promising tool to study P cycling under field conditions is the 18O:16O ratio of phosphate (δ18OP). In this study we investigate whether the δ18OP can be used to elucidate the effect soil pH on P cycling in grasslands. Soils and plants were sampled from different fertilisation and lime treatments of the Park Grass long term experiment at Rothamsted Research, UK. The soils were sequentially extracted to isolate different soil P pools, including available P and corresponding δ18OP values were determined. We did not observe changes in plant δ18OP value, but soil P δ18OP values changed, and lower δ18OP values were associated with higher soil pH values. At sites where P was not limiting, available P δ18OP increased by up to 3‰ when lime was applied. We show that the δ18OP method is a useful tool to investigate the effect of pH on soil P cycling under field conditions as it highlights that different soil processes must govern P availability as pH shifts. The next challenge is now to identify these underlying processes, enabling better management of soil P at different pH.

KeywordsGrassland; Oxygen isotopes; Park Grass; PH; Phosphorus; P limitation
Year of Publication2020
JournalScientific Reports
Journal citation10 (2065)
Digital Object Identifier (DOI)doi:10.1038/s41598-020-59103-2
Open accessPublished as ‘gold’ (paid) open access
FunderRothamsted Research
Biotechnology and Biological Sciences Research Council
Natural Environment Research Council
Funder project or codeRothamsted Fellowship
S2N - Soil to Nutrition - Work package 2 (WP2) - Adaptive management systems for improved efficiency and nutritional quality
S2N - Soil to Nutrition - Work package 3 (WP3) - Sustainable intensification - optimisation at multiple scales
Understanding the cycling of phosphorus: δ18OPO4 as a novel tracer of plant adaptation strategies.
Understanding the cycling of phosphorus: δ18OPO4 as a novel tracer of plant adaptation strategies.
Publisher's version
Accepted author manuscript
Output statusPublished
Publication dates
Online07 Feb 2020
Publication process dates
Accepted20 Jan 2020
PublisherElsevier
Nature Publishing Group
ISSN2045-2322

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