Organic Acids Regulation of Chemical Microbial Phosphorus Transformations in Soils

A - Papers appearing in refereed journals

Menezes-Blackburn, D., Paredes, C., Zhang, H., Giles, C. D., Darch, T., Stutter, M., George, T. S., Shand, C., Lumsdon, D., Cooper, P., Wendler, R., Brown, L., Blackwell, M. S. A., Wearing, C., Haygarth, P. M. and Stralia, V. P. 2016. Organic Acids Regulation of Chemical Microbial Phosphorus Transformations in Soils. Environmental Science & Technology. 50 (21), pp. 11521-11531. https://doi.org/10.1021/acs.est.6b03017

AuthorsMenezes-Blackburn, D., Paredes, C., Zhang, H., Giles, C. D., Darch, T., Stutter, M., George, T. S., Shand, C., Lumsdon, D., Cooper, P., Wendler, R., Brown, L., Blackwell, M. S. A., Wearing, C., Haygarth, P. M. and Stralia, V. P.
Abstract

We have used an integrated approach to study the mobility of inorganic phosphorus (P) from soil solid phase as well as the microbial biomass P and respiration at increasing doses of citric and oxalic acid in two different soils with contrasting agronomic P status. Citric or oxalic acids significantly increased soil solution P concentrations for doses over 2 mmol kg–1. However, low organic acid doses (<2 mmol kg–1) were associated with a steep increase in microbial biomass P, which was not seen for higher doses. In both soils, treatment with the tribasic citric acid led to a greater increase in soil solution P than the dibasic oxalic acid, likely due to the rapid degrading of oxalic acids in soils. After equilibration of soils with citric or oxalic acids, the adsorbed-to-solution distribution coefficient (Kd) and desorption rate constants (k–1) decreased whereas an increase in the response time of solution P equilibration (Tc) was observed. The extent of this effect was shown to be both soil and organic acid specific. Our results illustrate the critical thresholds of organic acid concentration necessary to mobilize sorbed and precipitated P, bringing new insight on how the exudation of organic acids regulate chemical–microbial soil phosphorus transformations.

Year of Publication2016
JournalEnvironmental Science & Technology
Journal citation50 (21), pp. 11521-11531
Digital Object Identifier (DOI)https://doi.org/10.1021/acs.est.6b03017
Open accessPublished as ‘gold’ (paid) open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeSustainability
Exploiting root exudation of organic acids and phytases to enhance plant utilisation of soil phosphorus
Publisher's version
Output statusPublished
Publication dates
Online04 Oct 2016
PublisherAmerican Chemical Society (ACS)
ISSN0013-936X

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