Dissolution of phosphate in a phosphorus-enriched ultisol as affected by microbial reduction

Journal of Environmental Quality
Kimberly J Hutchison, Dean Hesterberg

Abstract

Phosphorus dissolution often increases as soils become more reduced, but the mechanisms are not fully understood. The objectives of this research were to determine rates and mechanisms of P dissolution during microbial reduction of a surface soil from the North Carolina Coastal Plain. Duplicate suspensions of silt + clay fractions from a Cape Fear sandy clay loam (fine, mixed, semiactive, thermic Typic Umbraquult) were reduced in a continuously stirred redox reactor for 40 d. We studied the effects of three treatments on P dissolution: (i) 2 g dextrose kg(-1) solids added as a microbial carbon source at time 0 d; (ii) 2 g dextrose kg(-1) solids split into three additions at 0, 12, and 26 d; and (iii) no added dextrose. After 40 d of reduction, concentrations of dissolved reactive phosphorus (DRP) were similar for all treatments and increased up to sevenfold from 1.5 to 10 mg L(-1). The initial rate of reduction and dissolution of DRP was significantly greater for the 0-d treatment. A linear relationship (R(2) = 0.79) was found between DRP and dissolved organic carbon (DOC). Dissolved Fe and Al and pH increased, suggesting the formation of aqueous Fe- and Al-organic matter complexes. Separate batch experiments were performed to ...Continue Reading

References

Jan 15, 1996·Journal of Colloid and Interface Science·P PerssonS Sjöberg
Jul 21, 2004·Journal of Synchrotron Radiation·D HesterbergD E Sayers

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Citations

Oct 12, 2011·Environmental Science & Technology·Christian Mikutta, Ruben Kretzschmar
Feb 6, 2017·The Science of the Total Environment·J KopáčekJ Turek
Jul 11, 2006·Journal of Environmental Quality·Zhongqi HePaul M Bertsch
May 7, 2011·Journal of Environmental Quality·Fiona KizewskiDean Hesterberg
Aug 26, 2009·Journal of Environmental Quality·Carl Christian HoffmannBrian Kronvang
Feb 2, 2016·Journal of Environmental Quality·Casey D KennedyCarolyn J DeMoranville
Feb 9, 2017·Journal of Environmental Quality·Mohammed Masud ParvageHolger Kirchmann
Feb 11, 2015·Environmental Science & Technology·Jiří KopáčekEvžen Stuchlík

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