Evaluating the effectiveness of the phosphorus sorption index for estimating maximum phosphorus sorption capacity

2020 ◽  
Vol 84 (3) ◽  
pp. 994-1005
Author(s):  
Carl H. Bolster ◽  
Josh M. McGrath ◽  
Emileigh Rosso ◽  
Karin Blombäck
Keyword(s):  
Sorption Capacity ◽  
Phosphorus Sorption ◽  
Phosphorus Sorption Capacity ◽  
Sorption Index ◽  
Phosphorus Sorption Index

Study on Novel Structures Phosphorus Sorption Capacity of Surficial Sediment in Dongping Lake and Risk Assessment of Potential Phosphorus Release

2012 ◽  
Vol 518-523 ◽  
pp. 1089-1092
Author(s):  
Jie Dong ◽  
You Hua Xing ◽  
Xiao Min Gong
Keyword(s):  
Sorption Capacity ◽  
Risk Index ◽  
Ammonium Oxalate ◽  
Phosphorus Release ◽  
Phosphorus Sorption ◽  
The North ◽  
Dongping Lake ◽  
Phosphorus Sorption Capacity ◽  
Sorption Index ◽  
Phosphorus Sorption Index

Phosphorus sorption capacity of the surficial sediments are estimated by the phosphorus sorption index (PSI) and the degree of phosphorus saturation (DPS) of the sediments in the Dongping Lake, China. In addition, the risk of potential phosphorus release was also analyzed. The results showed that PSI gradually increased from the middle and the east of the lake to the north and the south, which was fan-shaped. However, the variation tendency of DPS was contray to this of PSI. PSI was very significantly and positively correlated to iron (FeOX) extracted from sediment by ammonium oxalate. DPS was significantly and positively correlated to phosphorus (POX) extracted from sediment by ammonium oxalate. Additionally, the analysis of the phosphorus release risk index (RRI) indicated that the Dongping Lake might be in high potential eutrophication risk due to the release of phosphorus from the surfacial sediments.

Spatial Analysis of Phosphorus Sorption Capacity in a Semiarid Altered Wetland

2003 ◽  
Vol 32 (1) ◽  
pp. 335-343 ◽  
Author(s):  
M. I. Litaor ◽  
O. Reichmann ◽  
M. Belzer ◽  
K. Auerswald ◽  
A. Nishri ◽  
...  
Keyword(s):  
Spatial Analysis ◽  
Sorption Capacity ◽  
Phosphorus Sorption ◽  
Phosphorus Sorption Capacity

Mapping soil phosphorus sorption capacity in four depths with uncertainty propagation

2020 ◽  
Author(s):  
Anders Bjørn Møller ◽  
Goswin Johann Hechrath ◽  
Cecilie Hermansen ◽  
Trine Nørgaard ◽  
Maria Knadel ◽  
...  
Keyword(s):  
Sorption Capacity ◽  
Agricultural Land ◽  
Mineral Fertilizer ◽  
Parent Material ◽  
Depth Interval ◽  
Detailed Knowledge ◽  
Phosphorus Sorption ◽  
Aeolian Deposits ◽  
Phosphorus Sorption Capacity ◽  
Extractable Iron

<p>Phosphorus (P) is one of the most important plant nutrients, and farmers regularly apply P as mineral fertilizer and with animal manures. Typically, reactions with amorphous aluminum and iron oxides or carbonates retain P in the soil. However, if P additions exceed the soil’s ability to bind them, P may leach from soil to surface waters, where it causes eutrophication. The phosphorus sorption capacity (PSC) is thus an inherent soil property that, when related to bound P, can describe the P saturation of the soil. Detailed knowledge of the spatial distribution of the PSC is therefore important information for assessing the risk of P leaching from agricultural land.</p><p>In weakly acidic soils predominant in Denmark, the PSC depends mainly on the oxalate-extractable contents of aluminum and iron. In this study, we aimed to map PSC in four depth intervals (0 – 25; 25 – 50; 50 – 75; 75 – 100 cm) for Denmark using measurements of oxalate-extractable aluminum and iron from 1,623 locations.</p><p>We mapped both elements using quantile regression forests. Predictions of oxalate-extractable aluminum had a weighted RMSE of 13.9 mmol kg<sup>-1</sup>. For oxalate-extractable iron, weighted RMSE was 33.5 mmol kg<sup>-1</sup>.</p><p>We included depth as a covariate and therefore trained one model for each element. For each element in each depth interval, we predicted the mean prediction value as well as 100 quantiles ranging from 0.5% to 99.5% in 1% intervals. The maps had a 30.4 m resolution. We then calculated PSC by convoluting the prediction quantiles of the two elements, using every combination of quantiles, in order to obtain the prediction uncertainty for PSC.</p><p>Oxalate-extractable aluminum was roughly normal distributed, while oxalate-extractable iron had a large positive skew. The age and origin of the parent material had a large effect on oxalate-extractable aluminum, and soil-forming processes such as weathering and podzolization had clear effects on the distribution in depth. Meanwhile, organic matter, texture and wetland processes were the main factors affecting oxalate-extractable iron, so much so that they obscured any trends with depth.</p><p>The weighted RMSE of the predicted PSC was 19.1 mmol kg<sup>-1</sup>. PSC was highest in wetland areas and lowest in young upland deposits, such as aeolian deposits and the loamy Weichselian moraines of eastern Denmark. The sandy glaciofluvial plains and Saalian moraines of western Denmark had intermediate PSC. In most cases, PSC was highest in the top soil, but in the sandy soils of western Denmark, PSC was highest in the depth interval 25 – 50 cm due to podzolization.</p>

The Use of Phosphorus Sorption Parameters in the Monitoring of Potential Emissions of this Component from the Arable Lands

2012 ◽  
Vol 63 (3) ◽  
pp. 24-30 ◽  
Author(s):  
Ewa Szara ◽  
Tomasz Sosulski
Keyword(s):  
Sorption Capacity ◽  
Agricultural Land ◽  
Agricultural Soils ◽  
Ammonium Oxalate ◽  
Degree Of Saturation ◽  
Phosphorus Leaching ◽  
Phosphorus Sorption ◽  
Soil Saturation ◽  
Sorption Parameters ◽  
Sorption Index

Abstract The study assesses the usefulness of different methods of determining the sorption properties of soils in relation to phosphorus in the agricultural soils from Central Poland in terms of the risk of environmental pollution posed by this component. As a reference parameter necessary to achieve the study.s objective, the sorption capacity of soils for phosphorus determined on the basis of the Langmuir model was used. The results of the tests were used to calculate the degrees of soil saturation with phosphorus: PE-R/Smax (Psat1); PE-R/PSI36 (Psat2), PM3/AlM3 + FeM3 (Psat3); Pox/Alox+Feox (Psat4); PE-R/AlM3+FeM3 (Psat5); PE-R/ Alox+Feox (Psat6). The usefulness of these indicators for assessing the risk of phosphorus emissions from agricultural land was determined on the basis of the coefficients of their correlation with the amount of active phosphorus in the soil. The study proved the usefulness of the Mehlich-3 and acid ammonium oxalate solutions for assessing the sorption capacity and the degree of saturation with phosphorus of typical Polish agricultural soils. For identifying the risk of phosphorus leaching from the soils, the parameter that specifies the extent of soil saturation with phosphorus as determined by the Egner-Riehm test and the sorption index (PSI) obtained by equilibrating the soils with a solution containing 36 mg P dm.3 at the soil-to-solution ratio of 1:10 (Psat2) were also found useful.

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