Phosphorus mobilization in unamended and magnesium sulfate-amended soil monoliths under simulated snowmelt flooding

Vitharana, U.W.A.; Kumaragamage, Darshani; Balasooriya, B. L. W. K.; Indraratne, S. P.; Goltz, Douglas M.

doi:10.1016/j.envpol.2021.117619

Cited by 16 publications

(19 citation statements)

References 56 publications

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“…The decrease in redox potential in soils with flooding is expected since the diffusion of O 2 is slower across standing water than in soil, resulting in rapid O 2 depletion due to microbial respiration leading to anaerobic conditions (Ponnamperuma, 1972). Similar decreases in Eh have been reported in other studies using flooded intact soil monoliths (Concepcion et al, 2020;Vitharana et al, 2021;Weerasekera et al, 2021).…”

Section: Change In Redox and Porewater Ph With Flooding And Fecl 3 -A...supporting

confidence: 68%

“…porewater to floodwater through soil-water interface in these two soils. Efficient transfer of P through the soil, and across the soil-water interface to floodwater, has been reported in previous studies even under simulated snowmelt conditions where intact soil monoliths were flooded under low temperatures (Concepcion et al, 2021;Vitharana et al, 2021;Weerasekera et al, 15 2021). Linear relationships between porewater and floodwater DRP concentrations were significant in all unamended soils (R 2 from 0.34 to 0.62; p<0.05) but not when FeCl 3 -amended, except Soil 3 at FeCl 3 rate of 2.5 Mg ha -1 (Fig.…”

supporting

confidence: 54%

“…Through chemical precipitation of phosphate as calcium (Ca) phosphates, gypsum (CaSO 4 •2H 2 O) is effective in reducing dissolved P in runoff water (Norton, 2008;Watts and Torbert, 2016), and in floodwater of flooded soils under both simulated spring snowmelt and summer-flooding conditions (Dharmakeerthi et al, 2019a;2019b). Surface amendment of magnesium (Mg) sulfate significantly reduced DRP in porewater and floodwater under simulated snowmelt flooding, with a lower rate of 2.5 Mg ha -1 showing greater effectiveness than the higher rate of 5 Mg ha -1 (Vitharana et al, 2021). Ferric chloride (FeCl 3 ) is an inorganic coagulant widely utilized in wastewater treatments due to its high performance in removing turbidity (Shi et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

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Ferric chloride amendment reduces phosphorus losses from flooded soil monoliths to overlying floodwater

et al. 2022

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Accumulation of phosphorus (P) in agricultural soils and subsequent losses to waterways contribute to eutrophication in surface water bodies. In agricultural lands prone to prolonged flooding during spring snowmelt, P may be released to overlying floodwater and transported to lakes downstream. Ferric chloride (FeCl3) is a potential soil amendment to mitigate P losses, but its effectiveness for flooded soils with snowmelt is not well documented. Thirty-six intact soil monoliths taken from four agricultural fields from Manitoba’s Red River Valley region were surface-amended with FeCl3 at three rates (0, 2.5, and 5 Mg ha-1) to evaluate the effectiveness of FeCl3 in minimizing P losses to porewater and floodwater. Over eight weeks of simulated snowmelt flooding, porewater and floodwater samples taken weekly were analyzed for concentrations of dissolved reactive P (DRP), calcium (Ca), magnesium (Mg), iron (Fe), manganese (Mn), and pH. Change in redox potential was also measured weekly. With time of flooding, redox potential decreased in all soil monoliths. At early stages of flooding, the porewater pH values were significantly lower in FeCl3-amended monoliths but increased with flooding time. Porewater and floodwater DRP concentrations increased in all soils when flooded, but the magnitudes varied. Amendment of FeCl3 decreased the DRP concentrations from 17-97% in porewater and 26-99% in floodwater, with the effectiveness varying depending on the soil, FeCl3 rate, and flooding time. Amendment of FeCl3 increased porewater concentrations of Ca, Mg, Fe, and Mn. Soil amendment with FeCl3 at both rates shows promise in mitigating redox-induced P losses from flooded soils.

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Section: Change In Redox and Porewater Ph With Flooding And Fecl 3 -A...supporting

confidence: 68%

supporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

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Ferric chloride amendment reduces phosphorus losses from flooded soil monoliths to overlying floodwater

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“…Part of the P desorbed from soil aggregate is absorbed and used by plants, and part of it may be lost. The snowmelt run‐off at high altitude regions may be an important way for soil P loss pathway, and rainwater enhances the mobility of soil P, this process is mainly dominated by CaCl 2 ‐P (Hoffman et al, 2019; Keith et al, 2018; Vitharana et al, 2021). As shown in Table 1, our results indicated that CaCl 2 ‐P exhibited a significant positive correlation with AP, TP ( p < 0.01).…”

Section: Discussionmentioning

confidence: 99%

The distribution, effectiveness and environmental threshold of soil aggregate phosphorus fractions in the sub‐alpine region of Southwest China

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This article is a study of total phosphorus (TP), available phosphorus (AP) and phosphorus (P) fractions of soil aggregates along an altitude gradient in the sub-alpine region of Southwest China. We conclude that soil aggregate TP and AP contents are higher at 3980 m and 3347 m; there are no significant differences in soil aggregate TP at any altitude (p > 0.05); the AP and phosphorus activation coefficient (PAC) are higher in 0.25-0.5 mm aggregate. Soil aggregates TPi > TPo at 3009 m and TPo > TPi at 3347, 3654 and 3980 m. Using multiple stepwise regression analysis, we conclude that NaOH-Pi is the key fraction of AP supply, NaHCO 3 -Pi and NaOH-Pi are important fractions of CaCl 2 -P. Through piecewise linear fitting of soil aggregate AP and CaCl 2 -P, the soil P environmental threshold obtained is 27.766 mg kg À1 in this region. Also we got <0.25 mm, 0.25-0.5 mm aggregates at 3980 m which have high soil P loss risk. Our study fills in gap about the distribution of P fraction in aggregates and effects of soil P fraction for AP and CaCl 2 -P in high-altitude areas. Our study provides a reference and scientific basis for understanding the soil aggregate P storage capacity and the biological effectiveness of P fractions at high altitudes. Our study on the P environmental threshold provides a reference for soil P storage capacity. Our study provides a reference value for the soil P loss risk management, and sustainable development of soil ecosystems in the sub-alpine region of Southwest China.

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“…Triplicate monoliths from each site were surface amended with either MnO 2 or zeolite at the rate of 5 Mg ha –1 , keeping a set of triplicate monoliths as the unamended control treatment. The rate of amendment was decided based on previous research. − …”

Section: Methodsmentioning

confidence: 99%

Phosphorus Release and Speciation in Manganese(IV) Oxide and Zeolite-Amended Flooded Soils

Attanayake

Kumaragamage

Amarawansha

et al. 2022

Environ. Sci. Technol.

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Phosphorus (P) losses from flooded soils and subsequent transport to waterways contribute to eutrophication of surface waters. This study evaluated the effectiveness of MnO2 and a zeolite Y amendment in reducing P release from flooded soils and explored the underlying mechanisms controlling P release. Unamended and amended (MnO2 or zeolite, surface-amended at 5 Mg ha–1) soil monoliths from four clayey–alkaline soils were flooded at 22 ± 2 °C for 56 days. Soil redox potential and dissolved reactive P (DRP), pH, and concentrations of major cations and anions in porewater and floodwater were analyzed periodically. Soil P speciation was simulated using Visual MINTEQ at 1, 28, and 56 days after flooding (DAF) and P K-edge X-ray absorption near-edge structure spectroscopy and sequential fractionation at 56 DAF. Porewater DRP increased with DAF and correlated negatively with pe+pH and positively with dissolved Fe. Reductive dissolution of Fe-associated P was the dominant mechanism of flooding-induced P release. The MnO2 amendment reduced porewater DRP by 30%–50% by favoring calcium phosphates (Ca–P) precipitation and delaying the reductive dissolution reactions. In three soils, the zeolite amendment at some DAF increased porewater and/or floodwater DRP through dissolution of Ca–P and thus was not effective in reducing P release from flooded soils.

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Phosphorus mobilization in unamended and magnesium sulfate-amended soil monoliths under simulated snowmelt flooding

Cited by 16 publications

References 56 publications

Ferric chloride amendment reduces phosphorus losses from flooded soil monoliths to overlying floodwater

Ferric chloride amendment reduces phosphorus losses from flooded soil monoliths to overlying floodwater

The distribution, effectiveness and environmental threshold of soil aggregate phosphorus fractions in the sub‐alpine region of Southwest China

Phosphorus Release and Speciation in Manganese(IV) Oxide and Zeolite-Amended Flooded Soils

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