Development of Indices to Predict Phosphorus Release from Wetland Soils

Mukherjee, Atanu; Nair, Vimala D.; Clark, Mark W.; Reddy, K. R.

doi:10.2134/jeq2008.0230

Cited by 26 publications

(19 citation statements)

References 46 publications

(89 reference statements)

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“…Analysis of soils in the Midwest region often utilize Mehlich-3 or Bray and Kurtz P-1 extractions to determine plant available P (Kovar and Pierzynski 2009); however, previous studies applied Mehlich-1 extractions to investigate P sorption dynamics in various U.S. regions such as the Mid-Atlantic, the Ozark Plateau, the Southeastern Piedmont, Gulf Coastal Plain, and Southern Coastal Plain (Dari et al 2018;Mukherjee et al 2009;Nair et al 2004). As a result, Mehlich-1 extractions were selected here in order to support comparisons from previous studies, which have mainly been conducted in the southeast and mid-Atlantic regions, and to apply established critical threshold and P storage capacity factor methodologies to soils in the Midwest including Mollisols, which have not been extensively evaluated.…”

Section: Resultsmentioning

confidence: 99%

Soil P Storage Capacity in Agricultural Treatment Wetlands: Can a System Designed for N Reduction Also Retain P?

et al. 2019

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Increasing interest focuses on utilizing wetlands to reduce nutrient loading to surface waters. The current study examines soil P storage capacity in three treatment wetlands designed to decrease N loading from an agricultural tile drainage system in Illinois. Adjacent farm field and restored floodplain wetland soils were also evaluated. Results demonstrate that wetland soils sequestered P; however, the magnitude of P retention varied significantly across treatment systems and floodplain wetlands related to differences in soil properties. Soil P storage capacity increased in the direction of water flow, but varied across treatment wetlands; soils ranged from P sinks (5.8 ± 1.5 mg P kg −1 ) to potential P sources (−17.2 ± 2.0 mg P kg −1 ). Farm fields displayed the highest water soluble P levels (11.3 ± 1.5 mg P kg −1 ) and represented the largest potential source of P with a mean storage capacity of −48.6 ± 6.8 mg P kg −1 . A phosphorus saturation ratio threshold value of 0.10 differentiated between potential P sources and sinks. Findings suggest wetlands receiving P loadings from tile drainage accumulate soil P over time, but maintaining P removal efficiency in treatment wetlands may require periodic management to decrease soil P concentrations via nutrient removal and/or soil amendments.

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Section: Resultsmentioning

confidence: 99%

Soil P Storage Capacity in Agricultural Treatment Wetlands: Can a System Designed for N Reduction Also Retain P?

et al. 2019

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“…1). The number of soil samples collected from each site following a protocol developed in an earlier study (Mukherjee et al, 2009) was not uniform but depended on a number of factors including accessibility to the site. Soils were sampled using a 7‐cm diam.…”

Section: Methodsmentioning

confidence: 99%

“…A threshold PSR of 0.1 falls well within the 95% CI range for wetland soils as well. Mukherjee et al (2009) also used Mehlich 1-P, Fe, and Al to identify a threshold PSR of 0.1 for wetland soils. The SPSC approach is expected to be applicable across a range of soils for which a threshold PSR value can be determined.…”

Section: Soil Phosphorus Storage Capacity For Wetland Soilsmentioning

confidence: 99%

“…Spodosols of the Lake Okeechobee Watershed (LOW), having sandy surface A and E horizons with an underlying high P retentive spodic (Bh) horizon (Soil Survey Staff, 2010), pose an environmental risk with minimal addition of P to surface soils. Data collected on wetland soils located on varying soil types (Mukherjee et al, 2009) in four southeastern US states suggested that the threshold PSR of 0.1 might be a practical indicator to assess nutrient enrichment in wetland soils where P solubility is regulated by Fe and Al.…”

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confidence: 99%

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Evaluation of Legacy Phosphorus Storage and Release from Wetland Soils

Nair¹,

Clark²,

Reddy³

2015

J. Environ. Qual.

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To better manage legacy phosphorus (P) in watersheds, reliable techniques to predict P storage and release from uplands, ditches, streams, and wetlands must be developed. Techniques such as the P saturation ratio (PSR) and the soil P storage capacity (SPSC), originally developed for upland soils, are hypothesized to be applicable to wetland soils as well. Surface soils were collected from eight beef ranches within the Lake Okeechobee Watershed, FL, to obtain a threshold PSR value and to evaluate the use of PSR and SPSC for identifying legacy P storage and release from wetland soils. Water-soluble P (WSP) was determined for all soils; the equilibrium P concentration (EPC) was determined for selected soils through the generation of Langmuir isotherms. The threshold PSR for wetland soils, calculated from P, Fe, and Al in a Mehlich 1 solution, was determined to be 0.1; SPSC, calculated using the threshold PSR, was found to be related to WSP. When SPSC was positive, WSP and EPC were minimal. However, both WSP and EPC increased once SPSC became negative. Organic matter (OM) varied from 0.4 to 90 g kg for both positive and negative SPSC, suggesting that OM in wetland soils does not have any effect on P retention and release below the threshold PSR. Moreover, when a wetland or drainage ditch is heavily P impacted, it could be a P source; wetland vegetation may no longer be able to assimilate additional P, resulting in P loss from the soil. This study suggests that the PSR-SPSC concept could be a valuable tool for evaluating legacy P release from wetlands.

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“…Low level of nitrates and phosphates in top soils of functioning and abandoned paddy fields may be due to the same reason. Increase of nitrates and phosphates in bottom soil layer of functioning paddy field may be because of leaching (Chen et al 2006) of nutrients supplemented by fertilizers (Glendininget al, 1996, Mukherjee et al, 2009. Elevated nitrate level was recorded in top soil layer in industrial area because absence of denitrification due to aerobic conditions of the soil which inhibits denitrification process and combustion of fossil fuels that produce NO x gasses which ultimately enriches soil by nitrates via precipitation (Miroslav and Vladimir, 1999).…”

Section: Discussionmentioning

confidence: 99%

Spatial Variability of Soil Characteristics Along a Landscape Gradient in Bellanwila-Attidiya Area

Cooray

Piyadasa

Wickramasinghe

2012

JTFE

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Wetlands are comprised of unique components of soil, water and biodiversity which are interconnected. Although water and biodiversity components of wetlands have been somewhat investigated, a very few research have been carried out to investigate soil properties. This study focused on spatial variability of soil chemical and physical parameters in a land use gradient around the Bellanwila-Attidiya Sanctuary, It was carried out for a period of 3 months and several random soil samples were obtained from all land use areas. Selected physical and chemical properties of soil were analyzed according to the standard methods and the GIS maps were developed using ArcView GIS 3.2.The results indicated that selected chemical and physical parameters of soil varied across the land use gradient, except for temperature. According to the GIS maps there are apparent variations in distribution of soil properties. On the surface, the highest level of each parameter was found as follows: -NO 3 --industrial area, PO 4 3--functioning paddy fields, SO 4 2--residential area, Cl --residential area, Fe 3+ -functioning paddy fields, moisture content -wetland, pH, acidic -industrial area, salinityresidential area, electrical conductivity -residential area. At a 1 m depth, the pattern was different: NO 3 --abandoned paddy fields, PO 4 3--functioning paddy fields, SO 4 2--wetland, Cl --wetland, Fe 3+ -residential area, moisture content -wetland, pH -industrial area, salinity -wetland, electrical conductivity -wetland. The findings clearly exhibit the increases in anthropogenic pressure have resulted in wide-scale alternation of soil properties, at least in the surface soil, across a land use gradient. Managing land use in the watershed of the wetland thus needs adequate attention to conserve this natural ecosystem.

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Development of Indices to Predict Phosphorus Release from Wetland Soils

Cited by 26 publications

References 46 publications

Soil P Storage Capacity in Agricultural Treatment Wetlands: Can a System Designed for N Reduction Also Retain P?

Soil P Storage Capacity in Agricultural Treatment Wetlands: Can a System Designed for N Reduction Also Retain P?

Evaluation of Legacy Phosphorus Storage and Release from Wetland Soils

Spatial Variability of Soil Characteristics Along a Landscape Gradient in Bellanwila-Attidiya Area

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