Diffusive phosphate transport in Al-rich acidic porous cation exchange system

Ro, Hee‐Myong; Cho, C. M.

doi:10.4141/s99-113

Cited by 5 publications

(6 citation statements)

References 16 publications

(37 reference statements)

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“…P 2 O 5 in CS can also be explained by its precipitation in heavy metal-contaminated acid soils because av. P 2 O 5 precipitates with coexisting Al and Fe hydrolytic metal species, which also decrease soil pH (Ro and Cho, 2000). At the same time, reduced soil pH also results in a concomitant increase in exchangeable cations.…”

Section: Discussionmentioning

confidence: 99%

Effects of Heavy Metal Contamination from an Abandoned Mine on Tomato Growth and Root-knot Nematode Development

Park¹,

Lee²,

Ro³

et al. 2011

The Plant Pathology Journal

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Physicochemical characteristics and heavy metal content of soils located along the drainage way of an abandoned mine at Busan, Korea (35 o 31'N, 129 o 22'E) (contaminated soil; CS) and uncontaminated soils (50− 70 m apart from the drainage way) (NS) were examined. Growth of tomato plants (Solanum lycopersicom cv. Rutgers) in CS and NS, development of the root-knot nematode (Meloidogyne incognita) as root-knot gall formation on tomato plants, and non-parasitic nematode populations in soil were also examined. Growth of tomato plants, root-knot gall formation, and non-parasitic nematode populations were significantly reduced in CS with higher As content, lower pH, higher electrical conductivity (EC), and lower available phosphate (av. P 2 O 5 ) than in NS. None of the other physicochemical characters examined differed significantly between CS and NS (low and no significance) and were above or below the critical levels detrimental to plant growth and nematode development, suggesting that As may be the primary hazardous heavy metal in CS. The toxicity of As might be enhanced at low pH in CS because exchangeable forms of some heavy metals increase with the decrease of soil pH. The heavy metals, especially As, may have contributed to increasing EC and decreasing av. P 2 O 5. Therefore, the effects of mine drainage contamination from the abandoned mine were derived primarily from contamination by heavy metals such as As. These may have been enhanced in toxicity (solubility) by the lowered pH, increased soil salinity (EC) and decreased av. P . Our results suggest synergistic adverse effects on the plant and the nematode by decreasing osmotic potential and nutrient availability.

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Section: Discussionmentioning

confidence: 99%

Effects of Heavy Metal Contamination from an Abandoned Mine on Tomato Growth and Root-knot Nematode Development

Park¹,

Lee²,

Ro³

et al. 2011

The Plant Pathology Journal

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“…Chaplain et al (2011) ascribed the subsequent decrease in soil pH after liming to the protonation of variable charges and retention of positively charged hydroxyl-Al polymers. However, Ro and Cho (2000) observed that the formation of solid phosphate precipitates resulted in a lowering of soil pH due to H + production in both acidic soil systems.…”

Section: Effect Of Liming On P Measures and Exchangeable Cationsmentioning

confidence: 95%

“…Phosphorous (P) has been recognized as a major limiting nutrient for sustaining the productivity and resilience of terrestrial ecosystems (Poeplau et al, 2016;Vásconez et al, 2018), and the availability and chemical form is very sensitive to changes in soil pH. In acidic soils Al 3+ and Fe 3+ react extensively with phosphates (H 2 PO 4 and HPO 4 2-) to form insoluble Al and Fe phosphate compounds (Ro and Cho, 2000;Verma et al, 2005;Redel et al, 2016), while in neutral and alkaline soils Ca 2+ readily reacts with phosphates to form less insoluble Ca-P compounds (Lindsay, 1979). However, recent evidence suggests the possibility of conversion of Ca-P compounds into even more insoluble compounds, decreasing their solubilities (Mahdi et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Liming however, can reduce the availability of P in soils due to extensive interaction of P with Ca 2+ , Al 3+ and Fe 3+ ions (Machado and Silva, 2001), thus causing a shift in ionic composition. The changes in ionic composition due to changes in soil pH can in turn lead to a shift in chemical equilibria by increasing concentrations of dissolved Ca 2+ and displaced hydrolytic Fe and Al species (hereafter, be referred to as Al 3+ and Fe 3+ , respectively) that can decrease the availability of P in the soil solution (Ro and Cho, 2000). Since these reactions involve large number of chemical forms of P in soils, which are bound to metals or free cations and differ in their mobility and availability, the different P species, such as labile P, reductant P, and metal-bound P, coexist.…”

Section: Introductionmentioning

confidence: 99%

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Early-stage changes in chemical phosphorus speciation induced by liming deforested soils

Park

2018

J. Soil Sci. Plant Nutr.

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A hypothesis of whether an increase in Ca 2+ due to liming acid soils causes an increase in Ca-phosphates with a concomitant decrease in Al-and Fe-phosphates was tested on a relatively short-term time frame, as observed in the investigations of chemical phosphorus (P) speciation. Soil samples were taken at a deforested site and split into three treatment groups: a control and two CaCO 3 treatments (0.1 and 0.4 g CaCO 3 in 100 g soil). Each soil was incubated at 25±2°C for 40 days. Inorganic-P was partitioned into three fractions: Fraction-A (Al-and occluded Fe-P), Fraction-B (non-occluded Fe-and adsorbed-P), and Fraction-C (Ca-P). The pH of CaCO 3 -treated soils decreased right after liming, indicating a probable formation of solid phosphate compounds. Available P in CaCO 3 -treated soils decreased from 0.67 mg kg -1 to control levels at the end of incubation. Total-P and organic-P of CaCO 3 -treated soils were virtually the same as those of control soils, while inorganic-P varied. Fraction-A in both CaCO 3 -treated soils peaked at 10 days of incubation, and then decreased below control levels, while Fraction-B decreased abruptly right after liming, and thereafter gradually decreased. Liming decreased Fraction-C, and caused an increase in Al-and Fe-P due to an increase in exchangeable Al 3+ and Fe 3+ . Our results challenge the hypothesis by showing the unexpected opposite data for Al-, Fe-and Ca-P compounds at least in the early stage of equilibrium disturbances due to liming an acidic soil.

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“…However, cations (e.g., Al 3+ , Fe 3+ or Ca 2+ ) of the soil solution can precipitate phosphates, thus lowering the amount of available P (Ro and Cho, 2000). Therefore, the assimilation of P as orthophosphate by microorganisms and plants usually requires several phosphatases transforming organic P into inorganic P. As an extracellular enzyme, phosphatase activity in soil is mostly influenced by the interactions at solid-liquid interfaces (Burns, 1978), since they can be adsorbed by negatively charged clay minerals (Fusi et al, 1989).…”

Section: Introductionmentioning

confidence: 99%

Salinity effects on chlorpyrifos degradation and phosphorus fractionation in reclaimed coastal tideland soils

Yun¹,

Lee

et al. 2010

Geosci J

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We examined the effect of soil salinity on the degradation of chlorpyrifos and the residual effect of chlorpyrifos and its metabolites on soil P fractionation during 60-day aerobic incubation. A sandy loam soil (Typic Psammaquents) was collected from the Daeho reclaimed tideland and two-thirds of the soil was applied with Na salt to get three different soil salinity levels: 4.6 (low, EL), 9.7 (medium, EM), and 14.4 (high, EH) dS m -1 . Estimated half-lives for chlorpyrifos degradation were 7.1 in EL, 10.0 in EM and 16.9 days in EH soils. During the degradation of chlorpyrifos in soil, microbial activity decreased by increasing soil salinity and its inhibitory effect increased with time. In contrast, the addition of chlorpyrifos did not inhibit soil alkaline phosphatase (SAP) activity, which was higher in EH than in control soils. Chlorpyrifos added at a rate of 5.0 mg a.i. kg -1 dry soil did not affect the distribution pattern of P fractions in control soils. Both an increase in soil salinity and soil sterilization increased the Ca-bound P fraction and decreased the occluded Fe + Al-bound P fraction with a significant interaction between soil salinity and sterilization. With time, the Ca-bound P fraction increased and organic-and occluded Fe + Al-bound P fractions decreased, while total-P, available-P, and non-occluded + adsorbed P fraction remained unchanged. Particularly, organic-P was mineralized more in EH than in control soils and the Ca-bound P fraction contained the highest inorganic P released. Mineralization of organic P and partitioning of released P in the recalcitrant Ca-bound P fraction increased by increasing soil salinity, while available P fraction remained unchanged, suggesting that the addition of chlorpyrifos at the currently recommended dosage level did not seem to considerably affect the available P fraction with low P leaching potential to waterways.

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Diffusive phosphate transport in Al-rich acidic porous cation exchange system

Cited by 5 publications

References 16 publications

Effects of Heavy Metal Contamination from an Abandoned Mine on Tomato Growth and Root-knot Nematode Development

Effects of Heavy Metal Contamination from an Abandoned Mine on Tomato Growth and Root-knot Nematode Development

Early-stage changes in chemical phosphorus speciation induced by liming deforested soils

Salinity effects on chlorpyrifos degradation and phosphorus fractionation in reclaimed coastal tideland soils

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