Effects of soil flooding on P transformations in soils of the Mesopotamia region, Argentina

Quintero, César; Boem, Flavio Hernán Gutiérrez; Romina, María Befani; Boschetti, N. G.

doi:10.1002/jpln.200625015

Cited by 18 publications

(12 citation statements)

References 20 publications

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“…Our results identified amorphous Fe(III) and Al minerals as the best predictors of soil PSI values but not Fe(II) minerals. These results suggest that soil Fe(II) minerals alone were in- sufficient to explain P sorption capacity compared to Fe(III) or Al minerals, consistent with previous studies (Sallade and Sims, 1997;Quintero et al, 2007;Rakotoson et al, 2014). However, soil Fe(III) and Al minerals were less responsive to redox manipulation compared to Fe(II) minerals.…”

Section: Phosphorus Sorption and Fe And Al Mineralssupporting

confidence: 89%

“…These soils often contain high concentrations of redox-sensitive poorly crystalline or amorphous Fe minerals (Hall and Silver, 2015;Wilmoth et al, 2018;de Campos et al, 2016). Under anoxic conditions, Fe(III) minerals undergo reductive dissolution and are transformed into Fe(II) phases that are assumed to be less effective at binding P (Quintero et al, 2007;Rakotoson et al, 2014;Shenker et al, 2005). Reducing conditions increase pH and decrease surface charges that are thought to be central to P sorption (Oh et al, 1999;Willett, 1989).…”

Section: Introductionmentioning

confidence: 99%

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Anoxic conditions maintained high phosphorus sorption in humid tropical forest soils

et al. 2020

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The strong phosphorus (P) sorption capacity of iron (Fe) and aluminum (Al) minerals in highly weathered, acidic soils of humid tropical forests is generally assumed to be an important driver of P limitation to plants and microbial activity in these ecosystems. Humid tropical forest soils often experience fluctuating redox conditions that reduce Fe and raise pH. It is commonly thought that Fe reduction generally decreases the capacity and strength of P sorption. Here we examined the effects of 14 d oxic and anoxic incubations on soil P sorption dynamics in humid tropical forest soils from Puerto Rico. Contrary to the conventional belief, soil P sorption capacity did not decrease under anoxic conditions, suggesting that soil minerals remain strong P sinks even under reducing conditions. Sorption of P occurred very rapidly in these soils, with at least 60 % of the added P disappearing from the solution within 6 h. Estimated P sorption capacities were much higher, often by an order of magnitude, than the soil total P contents. However, the strength of P sorption under reducing conditions was weaker, as indicated by the increased solubility of sorbed P in NaHCO 3 solution. Our results show that highly weathered soil minerals can retain P even under anoxic conditions, where it might otherwise be susceptible to leaching. Anoxic events can also potentially increase P bioavailability by decreasing the strength, rather than the capacity, of P sorption. These results improve our understanding of the redox effects on biogeochemical cycling in tropical forests.

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Section: Phosphorus Sorption and Fe And Al Mineralssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Anoxic conditions maintained high phosphorus sorption in humid tropical forest soils

et al. 2020

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“…After 10 d of draining, the concentrations of Fe-P, Al-P, and O-P during the reflooding period were greater than those during the flooding period. Several studies have examined P transformations in flooded-drained soils [9,14,40,46,47]. Furthermore, Ca-P was different in the four soils and increased only in the soil with high initial Ca-P.…”

Section: Soil P Following Long-term Flooding Draining and Refloodingmentioning

confidence: 99%

“…Many studies have examined soil P adsorption and release, especially under flooded conditions [9][10][11][12][13][14][15][16][17][18]. Flooding and draining causes chemical changes in soils, which leads to the dynamic…”

Section: Introductionmentioning

confidence: 99%

Phosphorus Dynamics in Long-Term Flooded, Drained, and Reflooded Soils

Tian

Dong

Karthikeyan

et al. 2017

Water

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Abstract:In flooded areas, soils are often exposed to standing water and subsequent drainage, thus over fertilization can release excess phosphorus (P) into surface water and groundwater. To investigate P release and transformation processes in flooded alkaline soils, wheat-growing soil and vegetable-growing soil were selected. We flooded-drained-reflooded two soils for 35 d, then drained the soils, and 10 d later reflooded the soils for 17 d. Dissolved reactive phosphorus (DRP), soil inorganic P fractions, Olsen P, pH, and Eh in floodwater and pore water were analyzed. The wheat-growing soil had significantly higher floodwater DRP concentrations than vegetable-growing soil, and floodwater DRP in both soils decreased with the number of flooding days. During the reflooding period, DRP in overlying floodwater from both soils was less than 0.87 mg/L, which was 3-25 times less than that during the flooding period. Regardless of flooding or reflooding, pore water DRP decreased with flooding days. The highest concentration of pore water DRP observed at a 5-cm depth. Under the effect of fertilizing and flooding, the risk of vertical P movement in 10-50 cm was enhanced. P diffusion occurred from the top to the bottom of the soils. After flooding, Al-P increased in both soils, and Fe-P, O-P, Ca 2 -P decreased, while Fe-P, Al-P, and O-P increased after reflooding, When Olsen P in the vegetable-growing soil exceeded 180.7 mg/kg and Olsen P in the wheat-growing soil exceeded 40.8 mg/kg, the concentration of DRP in pore water increased significantly. Our results showed that changes in floodwater and pore water DRP concentrations, soil inorganic P fractions, and Olsen P are significantly affected by fertilizing and flooding; therefore, careful fertilizer management should be employed on flooded soils to avoid excess P loss.

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“…Subsequent decrease in the released P concentration is sometimes observed because of resorption of P on clays and metal oxyhydroxides or because of precipitation of Fe(II)-P compounds (Amery & Smolders, 2012). The extent of P release by flooding differs among soil types (Ponnamperuma, 1985;Quintero et al, 2007). The increase in soluble P in soil due to Fe(III) reduction ranges up to 10-fold among different soils (Ann et al, 2000;Peretyazhko & Sposito, 2005).…”

Section: Introductionmentioning

confidence: 99%

Soil flooding and rice straw addition can increase isotopic exchangeable phosphorus in P‐deficient tropical soils

Rakotoson

Amery

Rabeharisoa

et al. 2014

Soil Use and Management

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Soil flooding increases phosphorus (P) availability due to reductive dissolution of P‐bearing Fe(III) minerals. It is, however, unclear whether such processes also act in P‐deficient soils of the tropics that have large Fe/P ratios (dithionite‐ and oxalate‐extractable P and Fe). The objective was to identify the extent of P release induced by flooding in such soils and the soil characteristics involved. Six topsoils (0.4–5% Fe) from rice fields in Madagascar were incubated aerobically and anaerobically for 66 days amended with factorial combinations of normalH2PO4− (0, 50 mg P/kg); half of the flooded soils were also amended with 1 g rice straw/kg prior to flooding to stimulate soil oxygen depletion. The release of P after flooding was measured at day 40 with 33P isotopic exchange, which detects both changes of labile P (exchangeable P) and changes in P solubility. Flooding increased labile P concentration in soil compared with aerobic soils by 1.4–60 mg P/kg, effects being significant in 6 of the 12 soil samples. Rice straw addition further increased the labile P in 5 of the 12 flooded soil samples by 2–27 mg P/kg. The release of labile P by flooding increased with soil oxalate‐extractable P concentration. Flooding combined with rice straw addition can increase the labile P in soil, even in soils with large amount of Fe; however, this release in unfertilized soils is likely insufficient for optimal nutrition of rice plants when evaluated against critical values for P solubility.

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Effects of soil flooding on P transformations in soils of the Mesopotamia region, Argentina

Cited by 18 publications

References 20 publications

Anoxic conditions maintained high phosphorus sorption in humid tropical forest soils

Anoxic conditions maintained high phosphorus sorption in humid tropical forest soils

Phosphorus Dynamics in Long-Term Flooded, Drained, and Reflooded Soils

Soil flooding and rice straw addition can increase isotopic exchangeable phosphorus in P‐deficient tropical soils

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