Phosphorus release in response to pH variation in the lake sedimentswith different ratios of iron-bound P to calcium-bound P

Huang, Qinghui; Wang, Zijian; Wang, Chunxia; Wang, Shengrui; Jin, Xin

doi:10.3184/095422905782774937

Cited by 48 publications

(23 citation statements)

References 20 publications

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“…Desorption and flush‐out of labile P with ambient stream water offer another explanation for the smaller proportion of labile P in the bed sediment (Dorioz et al, 1989; Reddy et al, 1999). Especially eroded particles from acidic soil will lose labile and moderately labile Pi via desorption because of an increase in pH to slightly alkaline by the stream water (Ammer water: pH 7.3–8.1; Supplemental Table S4) (Huang et al, 2005).…”

Section: Discussionmentioning

confidence: 99%

Phosphorus Pool Composition in Soils and Sediments of Transitional Ecotones under the Influence of Agriculture

et al. 2019

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Transitional ecotones such as vegetated buffer strips, stream banks, and streambeds retain phosphorus (P) in the immediate surroundings of farmland. Yet the fate of P in these ecotones remains unclear. Our objectives were to (i) test the difference in the P pool composition of soil and sediment between sites surrounded by agriculture and forestry and (ii) test whether specific P pools differ among transitional ecotones. Phosphorus pools (by a modified Hedley fractionation scheme) and the degree of P saturation (DPS) were determined in 33 soil and sediment samples from eight farmland and three forest sites. At farmland sites, total P in soil and sediment was more than twofold higher as compared to forestry sites. The proportion of labile inorganic P (Pi) and the DPS were significantly larger in transitional ecotones close to farmland. We further used normalized values for comparing the respective ecotones at the sites. The deviation of each transitional ecotone relative to the respective site average revealed that the normalized total P concentration and proportions of labile and moderately labile Pi were significantly smaller in bed sediment adjacent to farmland as compared to respective stream bank and buffer strip soil, whereas the stable Ca‐Pi proportion was larger. The results reflected a decreased Pi sorption capacity in combination with Pi desorption and transfer of Pi into secondary Ca‐Pi minerals in bed sediment. In summary, the influence of agriculture increases labile P pools in soil and sediment, which are then subject to a succession of dynamic processes resulting in a partial loss of Pi to the aqueous phase as well as fixation of Pi in the Ca‐Pi pool. Core Ideas Agriculture has a pronounced impact on P status and pools in transitional ecotones. Labile Pi and degree of P saturation significantly increased in buffer strips, stream banks, and beds. We found more Ca‐Pi but less labile P in streambeds than in stream banks and buffer strips. There is presumable transfer of labile P into the Ca‐Pi pool but also in the dissolved phase. Further knowledge of P pool changes is needed to manage legacy P in catchments.

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Section: Discussionmentioning

confidence: 99%

Phosphorus Pool Composition in Soils and Sediments of Transitional Ecotones under the Influence of Agriculture

et al. 2019

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“…Jensen, Kristensen, Jeppesen and Skytthe [23] analyzed sediment from 12 different lakes and found that for aerobic sediments the phosphate concentration is related to the Fe:P ratio and total iron controls the maximum adsorption capacity [25]. Phosphorous releases are also affected by calcium concentrations with release rates more affected by pH than redox conditions [26].…”

Section: Phosphorus Release From Sedimentsmentioning

confidence: 99%

Characterizing Total Phosphorus in Current and Geologic Utah Lake Sediments: Implications for Water Quality Management Issues

2018

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Utah Lake is highly eutrophic with large phosphorous inflows and a large internal phosphorous reservoir in the sediment. There are debates over whether this phosphorous is from geologic or more recent anthropologic sources. This study characterizes total phosphorous in geologic and current lake sediments to attempt to address that question. The average total phosphorous concentrations in the lake sediment were 666 ppm, with most samples in the 600 to 800 ppm range with a few larger values. Concentrations in historic geologic sediments were not statistically different from lake sediments. A spatial analysis showed that phosphorous distributions appeared continuous from the lake to the shore and that high and low values could be attributed to areas of seeps and springs (low) or feed lots and waste water discharge (high). These results indicate that geologic sediments without anthropogenic impacts are not statistically different than current lake sediments. The high values indicate that internal natural phosphorous loadings could be significant and the impaired state may be relatively insensitive to external anthropogenic loadings. If this is the case, then mitigation efforts to address anthropogenic sources may have minimal impacts. This case study presents an impaired water body where non-anthropogenic nutrient sources are significant and shows that reservoir management decisions should consider these non-anthropogenic phosphorous sources relative to anthropogenic sources. This study can serve as a template for evaluating the importance of geologic phosphorous sources for management decisions.

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“…After determination, the sediment background values are NaOH-P 57.76 mg/kg, HCl-P 6.01 mg/kg, IP 63.77 mg/kg, Or-P 12.73 mg/kg and TP 76.49 mg/kg, accounted for the 75.51%, 7.86%, 83.37%, 16.63% and 100% of TP respectively. It is clear that the sediments are mainly composed by inorganic phosphorus, and the inorganic phosphorus mainly contains NaOH-P component, suggesting that the agricultural water body pollution is serious [15].…”

Section: Sedimentsmentioning

confidence: 99%

Migration and Transformation of Phosphorus Forms in Field Ditch Sediments

Tang¹,

Wang²,

Wan³

2014

TOEFJ

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A broad attention has been paid to the field ditches as the sewage interception channel for the agricultural nonpoint source pollution, however, rare studies have involved in the phosphorus migration and transformation between the ditch sediments and overlaying water, especially, from the ditch sediments to the water. The present paper aims to explore with XPS binding energy data how pH, dissolved oxygen, sunlight affect the process of phosphorus migration and transformation in ditch sediments to the water by methods of changing pH, aerating nitrogen and oxygen in water and changing the sunlight; and hopes to provide a guidance on how to give full play to the ditch's sewage interception capacity and avoid ditch becoming pollution source reversely. The experimental results with XPS binding energy data show that no electron transfer occurs insignificantly at different pH values in sediments, i.e. no electron transfer reaction occurs on surface. This reveals that the phosphorus absorption form HPO 4 2in sediment substitutes OHstate on the sediment surface. The amount of phosphorus migration and transformation is the minimum under the neutral condition, and the maximum under the alkaline condition. Under aerobic atmosphere, the data of XPS binding energy shows the surface charge of iron after oxygen aeration reduces, the surface charge of oxygen increases, i.e. Fe 2+ is oxidized into Fe 3+ , the phosphorus is absorbed increasingly; the experimental results with XPS binding energy data disclose there exists electron transfer reaction significantly, that is the illumination affects the process of phosphorus migration and transformation through dissolved oxygen (DO) and the pH impacted on the biological processes under the presence of sunlight in sediments, indirectly. The influence of illumination on the sediment phosphorus migration and transformation is regular insignificantly. Conclusively, the amount of migration and transformation in sunlight-free group is greater than the sunlight group.

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Phosphorus release in response to pH variation in the lake sedimentswith different ratios of iron-bound P to calcium-bound P

Cited by 48 publications

References 20 publications

Phosphorus Pool Composition in Soils and Sediments of Transitional Ecotones under the Influence of Agriculture

Phosphorus Pool Composition in Soils and Sediments of Transitional Ecotones under the Influence of Agriculture

Characterizing Total Phosphorus in Current and Geologic Utah Lake Sediments: Implications for Water Quality Management Issues

Migration and Transformation of Phosphorus Forms in Field Ditch Sediments

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