Degree of Phosphorus Saturation as a Predictor of Redox‐Induced Phosphorus Release from Flooded Soils to Floodwater

Kumaragamage, Darshani; Amarawansha, Geethani; Indraratne, S. P.; Jayarathne, Kumudu; Flaten, Don; Zvomuya, Francis; Akinremi, O. O.

doi:10.2134/jeq2019.04.0154

Cited by 14 publications

(14 citation statements)

References 59 publications

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“…Unamended soil had a low DPS (10%) compared with SSM-and LSM-amended soils with DPS >35%, and in these amended soils, we observed a significant increase in floodwater DRP concentrations with decreasing pe + pH values with the progression of flooding. Results of the current study are consistent with the observation of Kumaragamage et al (2019) that the release of P in response to flooding is positively related to DPS.…”

Section: 4supporting

confidence: 92%

“…Previous studies investigating flooding-induced P release have shown a consistent and a substantial increase in pore water and floodwater DRP concentrations with time of flooding in most unamended soils with the exception of a few (Amarawansha et al, 2015;Jayarathne et al, 2016;Kumaragamage et al, 2019). The increase in DRP concentration with flooding and the development of anaerobic conditions have been attributed to pH changes resulting in enhanced solubility of phosphate minerals and the reductive dissolution reactions releasing adsorbed and precipitated P (Maranguit, Guillaume, & Kuzyakov, 2017;Rakotoson, Rabeharisoa, & Smolders, 2016;Weerasekara et al, 2020).…”

Section: Changes In Drp In Pore Water and Floodwater With Flooding Timementioning

confidence: 90%

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Phosphorus release from intact soil monoliths of manure‐amended fields under simulated snowmelt flooding

et al. 2020

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Anaerobic conditions developed in soils with flooding can enhance the release of soil P to overlying water, but little information is available for soils with a long history of manure application. We examined the P release from manure‐amended soils under simulated snowmelt flooding. Intact monoliths from manured (solid swine manure [SSM] or liquid swine manure [LSM]) and unamended (control) field plots were collected from Carman, Manitoba. Monoliths were frozen for 7 d, thawed, flooded, and incubated at 4 ± 1 °C. Redox potential, pH, and concentrations of dissolved reactive P (DRP), Ca, Mg, Fe, and Mn in pore water and floodwater were determined weekly up to 56 d after flooding (DAF) and at 84 DAF. Redox potential decreased with DAF with a greater and more rapid decrease in SSM (from ∼300 to <0 mV by 84 DAF) compared with LSM and control (∼100 mV by 84 DAF). Pore water and floodwater DRP concentrations were significantly greater in manured treatments than in the control at all DAFs and in SSM than in LSM for most DAF. Whereas floodwater DRP concentrations remained relatively stable in the control treatment, concentrations in manured treatments increased substantially from the onset of flooding to 35–42 DAF (threefold to fourfold increase) and remained relatively stable thereafter. Significantly greater P release from SSM‐ than from LSM‐treated monoliths was due to greater input of P and the higher organic matter content in SSM‐treated soils. These favored the rapid development of anaerobic conditions that further induced P release.

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Section: 4supporting

confidence: 92%

Section: Changes In Drp In Pore Water and Floodwater With Flooding Timementioning

confidence: 90%

Phosphorus release from intact soil monoliths of manure‐amended fields under simulated snowmelt flooding

et al. 2020

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“…This often reached a peak of around 21 to 42 DAF and then declined with further flooding time (Figure 1). Similar trends in pore water DRP concentrations have been reported for numerous soils with contrasting properties when packed soil mesocosms were flooded under warm temperatures (Amarawansha et al, 2015;Jayarathne et al, 2016;Kumaragamage et al, 2019). A notable difference between pore water DRP trends of previous studies with packed soil mesocosms conducted in the laboratory and in field and soil monoliths flooded in the current study is the sharper and more abrupt increase in pore water DRP concentration in soil monoliths in the current study corresponding to the immediate decrease in Eh following flooding.…”

Section: Changes In Pore Water Drp Concentration Under Two Flooding Csupporting

confidence: 80%

“…Anaerobic soil conditions resulting from prolonged flooding may enhance the release of soil P to overlying surface runoff water (Amarawansha, Kumaragamage, Flaten, Zvomuya, & Tenuta, 2015; Jayarathne, Kumaragamage, Indraratne, Flaten, & Goltz, 2016; Kumaragamage et al., 2019). It has been documented that anaerobic conditions even for periods of less than 20 d can enhance short‐term bioavailable P (Scalenghe, Edwards, Barberis, & Ajmone Marsan, 2010).…”

Section: Introductionmentioning

confidence: 99%

Phosphorus mobilization from intact soil monoliths flooded under simulated summer versus spring snowmelt with intermittent freeze–thaw conditions

et al. 2021

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Enhanced phosphorus (P) release from flooded, anaerobic soils has been extensively studied under summer temperatures but not under cold temperatures with intermittent freeze–thaw events. We investigated the temperature and freeze–thaw effects during flooding on the release of P to floodwater from soil monoliths (15‐cm depth) collected from eight agricultural fields in Manitoba. Soil monoliths were flooded with reverse osmosis water and incubated for 56 d under simulated summer flooding (SSF; 22 ± 1 °C) or snowmelt flooding with intermittent freeze–thaw (IFT; 4 ± 1 °C with intermittent freezing) in triplicates. Redox potential (Eh), pore water and floodwater dissolved reactive P (DRP) concentrations, pH, and concentrations of Ca, Mg, Fe, and Mn were determined weekly. In seven soils, Eh decreased rapidly with days after flooding (DAF) under SSF to values <200 mV but not under IFT. Both pore water and floodwater DRP concentrations significantly increased with DAF in all soils under SSF and in seven soils under IFT. Although DRP concentrations were consistently greater under SSF than IFT in four soils, other soils had similar concentrations at certain DAF. Significant relationships between ion concentrations and redox status that fitted both IFT and SSF data in most soils suggest that similar redox‐driven mechanisms are responsible for the P release; however, less P was released under IFT than under SSF because soils were not severely reduced under IFT. Substantial P release in a few soils under IFT appeared to be unrelated to redox status, suggesting other P release mechanisms that are not redox driven.

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“…A single point P sorption study was conducted by equilibrating a soil sample with a solution containing 150 mg P L −1 (Amarawansha, Kumaragamage, Flaten, Zvomuya, & Tenuta, 2016) and calculating the P sorption capacity using the difference between the initial and equilibrium solution P concentrations. The degree of P saturation was calculated by expressing Olsen P as a percentage of P sorption capacity (Amarawansha et al., 2016; Kumaragamage et al., 2019). Organic matter and calcium carbonate equivalent were also analyzed using a modified loss on ignition method (Dean, 1974).…”

Section: Methodsmentioning

confidence: 99%

Temperature and freezing effects on phosphorus release from soils to overlying floodwater under flooded‐anaerobic conditions

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Increased phosphorus (P) availability under flooded, anaerobic conditions may accelerate P loss from soils to water bodies. Existing knowledge on P release to floodwater from flooded soils is limited to summer conditions and/or room temperatures. Spring snowmelt runoff, which occurs under cold temperatures with frequent freeze-thaw events, is the dominant mode of P loss from agricultural lands to water bodies in the Canadian Prairies. This research examined the effects of temperature on P dynamics under flooded conditions in a laboratory study using five agricultural soils from Manitoba, Canada. The treatments were (a) freezing for 1 wk at −20 • C, thawing and flooding at 4 ± 1 • C (frozen, cold); (b) flooding unfrozen soil at 4 ± 1 • C (unfrozen, cold); and (c) flooding unfrozen soil at 20 ± 2 • C (warm). Pore water and surface water were collected weekly over 8 wk and analyzed for dissolved reactive phosphorus (DRP), pH, calcium, magnesium, iron (Fe), and manganese (Mn). Soils under warm flooding showed enhanced P release with significantly higher DRP concentrations in pore and surface floodwater compared with cold flooding of frozen and unfrozen soils.The development of anaerobic conditions was slow under cold flooding with only a slight decrease in Eh, whereas under warm flooding Eh declined sharply, favoring reductive dissolution reactions releasing P, Fe, and Mn. Pore water and floodwater DRP concentrations were similar between frozen and unfrozen soil under cold flooding, suggesting that one freeze-thaw event prior to flooding had minimal effect on P release under simulated snowmelt conditions. Abbreviations: DAF, days after flooding; DRP, dissolved reactive phosphorus.

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Degree of Phosphorus Saturation as a Predictor of Redox‐Induced Phosphorus Release from Flooded Soils to Floodwater

Cited by 14 publications

References 59 publications

Phosphorus release from intact soil monoliths of manure‐amended fields under simulated snowmelt flooding

Phosphorus release from intact soil monoliths of manure‐amended fields under simulated snowmelt flooding

Phosphorus mobilization from intact soil monoliths flooded under simulated summer versus spring snowmelt with intermittent freeze–thaw conditions

Temperature and freezing effects on phosphorus release from soils to overlying floodwater under flooded‐anaerobic conditions

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