Spatial variability of bromide and atrazine transport parameters for a Udipsamment

Kazemi, Honeyeh; Anderson, Stephen H.; Goyne, Keith W.; Gantzer, Clark J.

doi:10.1016/j.geoderma.2008.01.018

Cited by 16 publications

(8 citation statements)

References 32 publications

(33 reference statements)

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“…The mass recovery of Br − in the soil samples averaged over the five layers for the 128 locations was 103.8%. These magnitudes of mass balances are comparable to other field studies which report Br − recoveries to range from 78% to 105% [ Ellsworth and Boast , 1996; Kazemi et al , 2008]. The soil water mass balance averaged over all of the locations and integrated over the 10 depths was 92.8%.…”

Section: Resultssupporting

confidence: 86%

“…On the basis of spatial covariance of solute concentration at different soil depths in a cokriging scheme, Zhang et al [1997] computed solute mass within and across a large field. Kazemi et al [2008] derived spatial ranges of autocorrelation on the order of 12 to 24 m for solute transport and pesticide degradation parameters at the field scale.…”

Section: Introductionmentioning

confidence: 99%

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Field experimental approach to bromide leaching as affected by scale‐specific rainfall characteristics

Wendroth¹,

Vásquez²,

Matocha³

2011

Water Resources Research

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[1] Although inherent soil spatial and temporal variabilities complicate analysis of solute leaching, impacts of specific processes associated with rainfall amount, intensity, and frequency on solute leaching under field conditions require investigation. The objective of this study was to introduce (1) a new experimental approach to quantify bromide (Br À ) leaching under field conditions as influenced by rainfall characteristics and (2) analytical opportunities applicable to scale-specific spatial treatment distribution. The quantitative range of treatments was established in nonrandom periodically oscillating patterns. The characteristic length of a period over which a treatment fluctuates was considered the specific treatment scale. A Br À tracer study was established in the field with treatments applied at two different spatial scales. The tracer was applied with a sprayer in a transect of 32 plots, each 2 m long, followed by a site-specific sprinkler irrigation, and 128 soil cores subsequently taken at 0.5 m intervals and divided into 10-cm depth increments. The scalespecific associations between treatments and Br À center of mass (COM) were addressed. Treatments can be periodically imposed over specific scales and their spatial relationships quantified with semivariance and power spectral analysis. An additive state-space model was applied to separate the long-and short-wave components of Br À COM. Subsequently, the large-scale process was described in an autoregressive state-space model. The proposed experimental approach and the separation of small-and large-scale variability components support studying soil ecosystem processes that vary at different scales even in the presence of underlying large-scale trends that are currently considered obstacles in field research.Citation: Wendroth, O., V. Vasquez, and C. J. Matocha (2011), Field experimental approach to bromide leaching as affected by scalespecific rainfall characteristics, Water Resour. Res., 47, W00L03,

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Section: Resultssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Field experimental approach to bromide leaching as affected by scale‐specific rainfall characteristics

Wendroth¹,

Vásquez²,

Matocha³

2011

Water Resources Research

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“…The mass recovery of Br − in the soil samples averaged across 0–60 cm depth for the sampled transect was 84%. This magnitude of mass balance is within the range of other studies (Ellsworth and Boast, 1996; Kazemi et al, 2008; Wendroth et al, 2011b). However, in some profiles the amount of Br − recovered was very low.…”

Section: Resultssupporting

confidence: 88%

A New Experimental Design Reveals the Impacts of Land Use and Irrigation Characteristics on Bromide Leaching

Schwen

Yang

Walton

et al. 2012

Vadose Zone Journal

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The impact of different land use systems and rainfall characteristics on water and solute transport has not been the subject of many studies. One challenge in solute leaching experiments is the high natural spatial variability of flow‐controlling soil properties. To overcome this limitation and reveal the impacts and relative influences of land use (either grassland or cropland), irrigation amount and intensity, and application time delay on water infiltration and solute leaching, a field‐scale leaching experiment was conducted where treatments were arranged in a repetitive pattern along a transect. This design approach permitted spatial variation scale analysis and frequency domain analysis of variance components. The experiment was evaluated in terms of changes in the soil matric potential and in the infiltration depth of the applied tracer (KBr). The results gave evidence that water infiltration was mainly controlled by the amount of water and to a smaller extend by the land use with a larger increase in soil water content on the cropland. Contrarily, solute leaching was mainly controlled by the land use with a larger infiltration depth on the cropland. The relative influences of irrigation amount and intensity were smaller. Irrigation intensity and application time delay were negatively correlated with leaching depth, indicating a decreasing risk for deep leaching with increasing time between solute application and rainfall. The presented experimental design may be highly useful to overcome limitations resulting from the high spatial variability of physical soil properties when studying field‐scale hydrological and transport phenomena.

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“…Purity of the VAs and ATZ was >95% (Sigma‐Aldrich), and the 14 C‐ATZ had a specific activity of 160 mCi mmol −1 [ring‐ 14 C (U); American Radiolabeled Chemicals, Inc.]. Selection of the ATZ concentration (500 µg kg −1 ) was based on observations in sandy soil (Kazemi et al, 2008). The 100 μg kg −1 OTC and SMZ concentrations are within the range of environmentally relevant VA concentrations (Aga et al, 2005; Hamscher et al, 2005; Topp et al, 2013).…”

Section: Methodsmentioning

confidence: 99%

Veterinary Antibiotic Effects on Atrazine Degradation and Soil Microorganisms

et al. 2016

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Veterinary antibiotics (VAs) in manure applied to agricultural lands may change agrichemical degradation by altering soil microbial community structure or function. The objectives of this study were to investigate the influence of two VAs, sulfamethazine (SMZ) and oxytetracycline (OTC), on atrazine (ATZ) degradation, soil microbial enzymatic activity, and phospholipid fatty acid (PLFA) markers. Sandy loam soil with and without 5% swine manure (w/w) was amended with 0 or 500 μg kgC radiolabeled ATZ and with 0, 100, or 1000 μg kg SMZ or OTC and incubated at 25°C in the dark for 96 d. The half-life of ATZ was not significantly affected by VA treatment in the presence or absence of manure; however, the VAs significantly ( < 0.05) inhibited ATZ mineralization in soil without manure (25-50% reduction). Manure amendment decreased ATZ degradation by 22%, reduced ATZ mineralization by 50%, and increased the half-life of ATZ by >10 d. The VAs had limited adverse effects on the microbial enzymes β-glucosidase and dehydrogenase in soils with and without manure. In contrast, manure application stimulated dehydrogenase activity and altered chlorinated ATZ metabolite profiles. Concentrations of PLFA markers were reduced by additions of ATZ, manure, OTC, and SMZ; adverse additive effects of combined treatments were noted for arbuscular mycorrhizal fungi and actinobacteria. In this work, the VAs did not influence persistence of the ATZ parent compound or chlorinated ATZ metabolite formation and degradation. However, reduced CO evolved from VA-treated soil suggests an inhibition to the degradation of other ATZ metabolites due to an altered soil microbial community structure.

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Spatial variability of bromide and atrazine transport parameters for a Udipsamment

Cited by 16 publications

References 32 publications

Field experimental approach to bromide leaching as affected by scale‐specific rainfall characteristics

Field experimental approach to bromide leaching as affected by scale‐specific rainfall characteristics

A New Experimental Design Reveals the Impacts of Land Use and Irrigation Characteristics on Bromide Leaching

Veterinary Antibiotic Effects on Atrazine Degradation and Soil Microorganisms

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