TY - JOUR
T1 - A Holistic Approach to Understanding the Desorption of Phosphorus in Soils
AU - Menezes-Blackburn, Daniel
AU - Zhang, Hao
AU - Stutter, Marc
AU - Giles, Courtney D.
AU - Darch, Tegan
AU - George, Timothy S.
AU - Shand, Charles
AU - Lumsdon, David
AU - Blackwell, Martin
AU - Wearing, Catherine
AU - Cooper, Patricia
AU - Wendler, Renate
AU - Brown, Lawrie
AU - Haygarth, Philip M.
N1 - Funding Information:
This work was performed as part of the Organic Phosphorus Utilisation in Soils (OPUS) project, funded by Biotechnology and Biological Sciences Research Council (BBSRC, BBSRC - BB/K018167/1) in the UK. We thank the Scottish Government Rural Environment Research and Analysis Directorate for funding aspects of this research. We gratefully acknowledge the assistance of C. Taylor, H. Taylor ,and S. Richards in soil collection and analysis, and the assistance of S. McGrath and J. Hernandez in data analysis.
Publisher Copyright:
© 2016 American Chemical Society.
PY - 2016/4/5
Y1 - 2016/4/5
N2 - The mobility and resupply of inorganic phosphorus (P) from the solid phase were studied in 32 soils from the UK. The combined use of diffusive gradients in thin films (DGT), diffusive equilibration in thin films (DET) and the "DGT-induced fluxes in sediments" model (DIFS) were adapted to explore the basic principles of solid-to-solution P desorption kinetics in previously unattainable detail. On average across soil types, the response time (Tc) was 3.6 h, the desorption rate constant (k-1) was 0.0046 h-1, and the desorption rate was 4.71 nmol l-1 s-1. While the relative DGT-induced inorganic P flux responses in the first hour is mainly a function of soil water retention and % Corg, at longer times it is a function of the P resupply from the soil solid phase. Desorption rates and resupply from solid phase were fundamentally influenced by P status as reflected by their high correlation with P concentration in FeO strips, Olsen, NaOH-EDTA and water extracts. Soil pH and particle size distribution showed no significant correlation with the evaluated mobility and resupply parameters. The DGT and DET techniques, along with the DIFS model, were considered accurate and practical tools for studying parameters related to soil P desorption kinetics. (Graph Presented).
AB - The mobility and resupply of inorganic phosphorus (P) from the solid phase were studied in 32 soils from the UK. The combined use of diffusive gradients in thin films (DGT), diffusive equilibration in thin films (DET) and the "DGT-induced fluxes in sediments" model (DIFS) were adapted to explore the basic principles of solid-to-solution P desorption kinetics in previously unattainable detail. On average across soil types, the response time (Tc) was 3.6 h, the desorption rate constant (k-1) was 0.0046 h-1, and the desorption rate was 4.71 nmol l-1 s-1. While the relative DGT-induced inorganic P flux responses in the first hour is mainly a function of soil water retention and % Corg, at longer times it is a function of the P resupply from the soil solid phase. Desorption rates and resupply from solid phase were fundamentally influenced by P status as reflected by their high correlation with P concentration in FeO strips, Olsen, NaOH-EDTA and water extracts. Soil pH and particle size distribution showed no significant correlation with the evaluated mobility and resupply parameters. The DGT and DET techniques, along with the DIFS model, were considered accurate and practical tools for studying parameters related to soil P desorption kinetics. (Graph Presented).
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U2 - 10.1021/acs.est.5b05395
DO - 10.1021/acs.est.5b05395
M3 - Article
C2 - 26911395
AN - SCOPUS:84963808607
SN - 0013-936X
VL - 50
SP - 3371
EP - 3381
JO - Environmental Science and Technology
JF - Environmental Science and Technology
IS - 7
ER -