Phosphorus Desorption Kinetics in Relation to Phosphorus Forms and Sorption Properties of Portuguese Acid Soils

Horta, Carmo; Torrent, J.

doi:10.1097/ss.0b013e3180577270

Cited by 50 publications

(12 citation statements)

References 25 publications

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“…This result was in agreement with our initial hypothesis and with the results of other studies on acidic soils (Börling et al 2004;do Carmo Horta and Torrent 2007;Villapando and Graetz 2001). Particularly, the m and n parameters, which describe the immediate and slow physical-chemical reactions at the solid-to-solution interface, were better correlated with the poorly crystalline fractions ("ox" method) than with the crystallized fractions ("cdb" minus the "ox" method; Walbridge et al 1991), suggesting that the poorly crystalline fractions were the most reactive.…”

Section: Al and Fe Oxides And Soil Organic Mattersupporting

confidence: 95%

“…In acidic soils, the iP sorption capacity was found to be mainly correlated with Al and Fe oxides (Börling et al 2004;Daly et al 2001;do Carmo Horta and Torrent 2007;Maguire et al 2001;Singh and Gilkes 1991;Villapando and Graetz 2001), organic matter (Daly et al 2001;Dubus and Becquer 2001), or clay (Börling et al 2004;Singh and Gilkes 1991). Soil physical-chemical properties were consequently used to build pedotransfer functions to predict the iP sorption capacity (Borggaard et al 2004;Burkitt et al 2006;Villapando and Graetz 2001).…”

Section: Introductionmentioning

confidence: 98%

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Predicting available phosphate ions from physical–chemical soil properties in acidic sandy soils under pine forests

et al. 2011

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Purpose For economic and environmental reasons, and for biomass production, appropriate concepts and diagnostic systems based on relevant processes are required to assess the phosphorus (P) supply capacity of the soils in the long term and to adapt P fertilization accordingly in forests. The amount of available phosphate ions (iP) can be quantified using an isotopic dilution procedure. However, this method is difficult to apply since it requires the use of radioactivity ( 32 P or 33 P). Our objective was thus to build pedotransfer functions for the prediction of available iP from physical-chemical soil properties. Materials and methods Using an isotopic dilution procedure, we assessed isotopic dilution parameters and calculated isotopically exchangeable iP (E) and diffusive iP at the solid-to-solution interface (Pr). Following previous studies, E and Pr were considered as available iP. Pedotransfer functions were developed for forest podzols and arenosols (litter+0−120 cm) with wide ranges of soil organic matter and poorly crystalline aluminum (Al) and iron (Fe) oxides. Using Pearson's correlation coefficients, we selected the physical-chemical properties that were the most closely correlated with the isotopic dilution parameters. Then, we used linear and nonlinear regressions between these soil properties and the isotopic dilution parameters to build pedotransfer functions. Pedotransfer functions were built using a calibration dataset (144 soil samples) and validated using another data set (34 soil samples). Results and discussion For the sandy and acidic forest soils studied here, the soil reactivity inferred with the isotopic dilution parameters was mainly determined by poorly crystalline Al and Fe oxides and to a lesser extent by organic matter. Soil organic matter probably competed with iP for the reactive surfaces, i.e., the surfaces of Al and Fe oxides. The relationships between these soil properties and the isotopic dilution parameters led to pedotransfer functions enabling the correct prediction of soil reactivity and E as a function of time, independently to the soil depth and at the scale of a forest ecosystem. The adjusted pedotransfer functions could however not be used to precisely predict Pr. As an alternative, other pedotransfer functions were adjusted to more precisely predict an indicator of Pr (Pr in 1,000 min). Conclusions Our results revealed the determinant role of poorly crystalline Al and Fe oxides in the dynamics of iP at the soil-to-solution interface and these results were related to other results on P biogeochemistry at the ecosystem scale. They also indicated that generalized pedotransfer functionswhich already include the main explanatory variables-would be improved by integrating the effect of depth. KeywordsAl and Fe oxides . Diffusive phosphate ions . Forest podzols . Isotopic dilution method . Isotopically exchangeable phosphate ions . Pedotransfer functions Responsible editor: Chengrong Chen Electronic supplementary material The online version of this article (

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Section: Al and Fe Oxides And Soil Organic Mattersupporting

confidence: 95%

Section: Introductionmentioning

confidence: 98%

Predicting available phosphate ions from physical–chemical soil properties in acidic sandy soils under pine forests

et al. 2011

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“…soil properties were similar in magnitude to those of molybdate, but with an opposite sign. The results for phosphate are in line with previous measurements of the kinetics of phosphate sorption and release (García-Rodeja and Gil-Sotres, 1997; Zeng et al, 2003;do Carmo Horta and Torrent, 2007).…”

Section: Kinetic Constants From the Elovich Equationsupporting

confidence: 81%

“…Similar results were obtained by Zeng et al (2003) for the sorption of phosphate by two Andisols. The same pattern was observed for the sorption of molybdate and phosphate by Al-and Fehydroxides, goethite, and acid soils (Bolan et al, 1985;Zhang and Sparks, 1989;Freese et al, 1995;Barrow, 1999;Brinton and O'Connor, 2003;do Carmo Horta and Torrent, 2007). Barrow (1999) has suggested that the "slow" reaction is due to diffusion of sorbed anions from surface sites into micropores within the structure of the soil constituents.…”

Section: Sorption Kineticsmentioning

confidence: 52%

Kinetics of Molybdate and Phosphate Sorption by Some Chilean Andisols

G¹,

Bolan

Theng

et al. 2009

R.C. Suelo Nutr. Veg.

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The kinetics for the sorption of molybdate and phosphate by four Chilean Andisols have been determined. About 55% of the molybdate and 61% of the phosphate was sorbed in the first 0.5 h, after which sorption slowly increased, reaching 90% for molybdate and 97% for phosphate after 72 h. At the same time, OH -ions were released into the external solution, raising its pH by 0.85 units for molybdate and by 0.65 units in the case of phosphate. These observations indicated that both anions were sorpbed by a ligand exchange mechanims. Among the five kinetic models examined (Table, 2), the Elovich equation gave the best fit of the experimental data (R 2 = 0.93 to 0.97, standard error = 0.35 to 0.94). The sorption rate constant ( ) for both anions was related to the organic matter (

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“…Parameter n, which accounts for the slow physical-chemical reactions, was extremely low (0.009), while the maximum theoretical value is 0.5 (Fardeau et al, 1991). The small number of active exchange sites on the solid constituents inferred by both the low Psorbing capacity and the low isotopic exchanges is probably explained by the low amorphous Al and Fe oxide contents in our acidic sandy soil (Chen et al, 2003;do Carmo Horta and Torrent, 2007). The amount of amorphous Al plus Fe was only 7.4 · 10 -6 mol g −1 whereas it can reach 0.5-1 · 10 −3 mol g −1 (McDowell and Condron, 2000;Stroia et al, 2007).…”

Section: Is the Methods Applicable For A Wide Variety Of Soil Conditions?mentioning

confidence: 92%

Quantifying gross mineralisation of P in dead soil organic matter: Testing an isotopic dilution method

Achat¹,

Bakker²,

Saur³

et al. 2010

Geoderma

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Phosphorus Desorption Kinetics in Relation to Phosphorus Forms and Sorption Properties of Portuguese Acid Soils

Cited by 50 publications

References 25 publications

Predicting available phosphate ions from physical–chemical soil properties in acidic sandy soils under pine forests

Predicting available phosphate ions from physical–chemical soil properties in acidic sandy soils under pine forests

Kinetics of Molybdate and Phosphate Sorption by Some Chilean Andisols

Quantifying gross mineralisation of P in dead soil organic matter: Testing an isotopic dilution method

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