Trace Elements in Benchmark Soils of Oklahoma

Richards, Jaben; Schroder, Jackie L.; Zhang, Hailin; Basta, Nicholas T.; Wang, Yanling; Payton, Mark E.

doi:10.2136/sssaj2012.0100

Cited by 26 publications

(18 citation statements)

References 18 publications

(40 reference statements)

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“…In the present study, path analysis confirmed the results of the multiple regressions but in some cases allowed us to more specifically identify the soil property most related to carrot Pb uptake [11]. Both path analysis and stepwise multiple linear regression detected pH and CEC as soil properties affecting carrot Pb uptake.…”

Section: Discussionsupporting

confidence: 79%

Transfer model of lead in soil–carrot (Daucus carota L.) system and food safety thresholds in soil

Ding

Zhang

et al. 2015

Enviro Toxic and Chemistry

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Reliable empirical models describing lead (Pb) transfer in soil-plant systems are needed to improve soil environmental quality standards. A greenhouse experiment was conducted to develop soil-plant transfer models to predict Pb concentrations in carrot (Daucus carota L.). Soil thresholds for food safety were then derived inversely using the prediction model in view of the maximum allowable limit for Pb in food. The 2 most important soil properties that influenced carrot Pb uptake factor (ratio of Pb concentration in carrot to that in soil) were soil pH and cation exchange capacity (CEC), as revealed by path analysis. Stepwise multiple linear regression models were based on soil properties and the pseudo total (aqua regia) or extractable (0.01 M CaCl2 and 0.005 M diethylenetriamine pentaacetic acid) soil Pb concentrations. Carrot Pb contents were best explained by the pseudo total soil Pb concentrations in combination with soil pH and CEC, with the percentage of variation explained being up to 93%. The derived soil thresholds based on added Pb (total soil Pb with the geogenic background part subtracted) have the advantage of better applicability to soils with high natural background Pb levels. Validation of the thresholds against data from field trials and literature studies indicated that the proposed thresholds are reasonable and reliable.

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Section: Discussionsupporting

confidence: 79%

Transfer model of lead in soil–carrot (Daucus carota L.) system and food safety thresholds in soil

Ding

Zhang

et al. 2015

Enviro Toxic and Chemistry

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“…Basta et al (1993) used path analyses to differentiate between the effects of pH, cation exchange capacity, and organic C on trace metal adsorption by two Iowa soils. Zhang et al (2005) and Richards et al (2012) used a path analysis to determine what soil chemical properties had the greatest impact on P adsorption and trace element content in 28 Oklahoma benchmark soils, respectively. Through path analyses, Tang et al (2007) showed how effective animal manure was in reducing Al toxicity in an acid soil, and Yan et al (2013) looked at manure effects on P sorption in a paddy soil.…”

mentioning

confidence: 99%

Path Analyses of Grain P, Zn, Cu, Fe, and Ni in a Biosolids‐Amended Dryland Wheat Agroecosystem

2016

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Land application of biosolids is an effective means of recycling plant nutrients and is the primary method of biosolids reuse endorsed by the USEPA. One issue concerning biosolids application is the extent of the contribution of biosolids-borne plant nutrients to the overall crop concentration and uptake or removal of these nutrients. We studied the effects of biosolids application on wheat ( L.) grain P, Zn, Cu, Fe, and Ni concentrations and uptake (removal) at two dryland agroecosystem sites from 1993 to 2014. We hypothesized that biosolids would have the greatest impact on wheat grain and uptake compared with ammonium bicarbonate-diethylenetriaminepentaacetic acid (AB-DTPA)-extractable nutrient levels, soil pH, or soil organic C concentrations. We used path analyses in combination with multiple linear regression to differentiate the direct, indirect, and total effects of cumulative biosolids applications, soil AB-DTPA, soil pH, and organic C. Biosolids rates, applied biennially from 1993 to 2014 at the beginning of a wheat-fallow rotation, were 0, 2.24, 4.48, 6.72, 8.96, and 11.2 Mg ha. None of the parameters had significant direct, indirect, or total effects on grain concentrations. Biosolids applications had the greatest positive direct impact compared with AB-DTPA levels, soil pH, or soil organic C on P, Zn, Fe, and Ni uptake (removal), whereas AB-DTPA had the greatest positive direct impact on Cu uptake. Soil AB-DTPA, pH, and organic C directly affected some grain concentrations and cumulative uptake, but no consistent trends were noted. This pathway approach allowed differentiation between causation and simple correlation for the effects of cumulative biosolids applications on wheat P, Zn, Cu, Fe, and Ni cumulative uptake but did not provide these same results for grain concentrations.

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“…A pathway was also considered for error variance ( U ) of the metal absorption as the response variable not measured by the direct and indirect effects of predictor variables. Considering R 2 as the determination coefficient, the error variance in pathway analysis can be calculated following (Richards et al, 2012):

U = \sqrt{1 - R^{2}}

Before using multiple linear regression and path analysis, the data were checked for normality. Data were log‐transformed where appropriate.…”

Section: Methodsmentioning

confidence: 99%

“…T he wide use of de‐icing salt (NaCl is most commonly used), heavy vehicular traffic on the wide streets in commercial land use zones in urban environment and the continual input of trace metals (Cu, Zn, Pb and Cd) to the urban soil adjacent to the streets (like tree pit soil) over time possibly are the main reasons of the elevated values of metals in urban soil (Kargar et al, 2013). Metal persistence in the environment, potential to bioaccumulate, and the mobility of Na and trace metals can make the contamination of urban soils with de‐icing salt and trace metals as an urban environmental problem (Richards et al, 2012).…”

mentioning

confidence: 99%

Bioavailability of Sodium and Trace Metals under Direct and Indirect Effects of Compost in Urban Soils

et al. 2016

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The contamination of urban soil with sodium (Na) and trace metals can be one of the major concerns for groundwater contamination and street tree health. The bioavailability of Na, copper (Cu), zinc (Zn), cadmium (Cd), and lead (Pb) in urban soil amended with 0, 5, and 10% w/w compost was evaluated at none, medium, and high contamination levels of soil mixtures. The relationship between soil properties, compost addition, contamination level and metal uptake by barley ( L.) was determined using multivariate linear regression and path analysis. The results indicated the direct negative effect of compost on metal absorption possibly through specific complexation for Cu, Zn, Cd, and Pb. Compost can also affect the absorption of Na and Cd indirectly by means of cation exchange capacity (CEC) and pH. The degree of soil contamination with metals can affect the competition of cations for the complexing sites of the soil mixtures and, therefore, can induce changes in metal availability for plants. Compost addition to the soil also increased nutrient availability, except for ammonium (NH) and nitrate (NO). We concluded that in the short term, the addition of compost significantly reduced metal bioavailability and improved nutrient availability. However, more studies are required to monitor the long-term ability of the compost to reduce Na and trace metal bioavailability in urban soil.

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Trace Elements in Benchmark Soils of Oklahoma

Cited by 26 publications

References 18 publications

Transfer model of lead in soil–carrot (Daucus carota L.) system and food safety thresholds in soil

Transfer model of lead in soil–carrot (Daucus carota L.) system and food safety thresholds in soil

Path Analyses of Grain P, Zn, Cu, Fe, and Ni in a Biosolids‐Amended Dryland Wheat Agroecosystem

Bioavailability of Sodium and Trace Metals under Direct and Indirect Effects of Compost in Urban Soils

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