Landscape indicators of groundwater nitrate concentrations: an approach for trans‐border aquifer monitoring

Gallagher, Tanya Louise; Gergel, Sarah E.

doi:10.1002/ecs2.2047

Cited by 16 publications

(6 citation statements)

References 57 publications

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“…Likewise, throughout the Edwards-Trinity aquifer, as grassland increased, the nitrate concentration in the groundwater increased (Figure 7). Furthermore, in our study, groundwater nitrate contamination is very similar to the results of previous studies (Almasri, 2007;Fallahzadeh et al, 2016;Gallagher and Gergel, 2017;Shrestha and Luo, 2017;Juntakut et al, 2019), where groundwater nitrate level exceeded 10 mg/l (see Table IX).…”

Section: Well-depth Cotton Grasslandsupporting

confidence: 91%

“…Similar to previous studies (Almasri andKaluarachchi, 2003, 2005;Almasri, 2007;Fallahzadeh et al, 2016;Gallagher and Gergel, 2017), this study aimed at predicting groundwater nitrate concentrations in a region of mixed land uses to control the environmental quality. As very few studies (Hu et al, 2005;Li et al, 2014;Al-Kalbani et al, 2017) have spatially linked groundwater nitrate concentrations to land use, land cover, our work provides an important approach that is highly relevant to other regions facing similar management challenges.…”

Section: 4mentioning

confidence: 90%

“…Nitrate is soluble and has high mobility, as well as the potential to move through an unsaturated zone by leaching (Chowdary et al, 2005). Many studies have shown the impacts of agricultural crop production on nitrate concentrations in groundwater (Harter et al, 2002;Jordan andSmith, 2005, Dubrovsky et al, 2005;Liu et al, 2005;Gallagher and Gergel, 2017). Harter et al (2002) assessed nitrate and salt leaching to shallow groundwater in semiarid vulnerable hydrogeologic regions, and they found that shallow groundwater vulnerability to nitrate contamination varied spatially.…”

Section: Introductionmentioning

confidence: 99%

“…Increased nitrate levels (more than 2 mg/l) in groundwater used for drinking can cause adverse health effects (Squillace et al, 2002); drinking water with nitrate concentrations of 4 mg/l increases the risk of non-Hodgkin's lymphoma (Driscoll et al, 2003). Groundwater guidelines for water with known concentrations of nitrate expressed in Table I (USGS, 2014;Gallagher and Gergel, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Factors affecting the spatial pattern of nitrate contamination in Texas aquifers

Lotfata

Ambinakudige

2019

MEQ

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Purpose The elevated level of nitrate in groundwater is a serious problem in Texas aquifers. To control and manage groundwater quality, the characterization of groundwater contamination and identification of the factors affecting the nitrate concentration of groundwater are significant. The purpose of this paper is to determine factors which have significant impacts on the elevated groundwater nitrate concentrations of the Southern High-Plains and the Edwards-Trinity aquifers. Design/methodology/approach The characterization of groundwater nitrate contamination was undertaken by analyzing the hydrochemical data of groundwater within a statistical framework. The multivariate statistical analysis (ordinary least square) and geographically weighted regression (GWR) models were used to study the relationship between groundwater nitrate contamination and land use of the study areas. Findings Results show groundwater nitrate contamination is typically due to an overapplication of N fertilizers to cotton in the Southern High-Plains aquifer and to grassland in the Edwards-Trinity aquifer. Adjusted R2 (0.45) explains variations of nitrate concentration by well-depth, cotton production, shrubland and grassland in the Edwards-Trinity aquifer. The results of an analysis of variations in N concentration with well depth for all 192 wells indicate that nitrate concentrations in water from wells in the Southern High-Plains and Edwards-Trinity aquifers tend to decrease with increasing well-depth. Originality/value In this study, the GWR model was built to identify nitrate concentration within a geographic framework to ensure sustainable use of groundwater, which is important for local management purposes. The analysis should include local spatial variations of elements such as hydrologic characteristics and the land use activities if groundwater nitrate contamination causes adverse effects on human and ecosystem health.

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Section: Well-depth Cotton Grasslandsupporting

confidence: 91%

Section: 4mentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Factors affecting the spatial pattern of nitrate contamination in Texas aquifers

Lotfata

Ambinakudige

2019

MEQ

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“…However, not all temporal variation in groundwater NO 3 concentrations can be explained by these factors. It has been hypothesized that the practices associated with raspberry field renovation and replanting may be responsible for some of this unexplained spatial and temporal variation in groundwater NO 3 concentrations (Zebarth et al, 2015; Gallagher and Gergel, 2017; Suchy et al, 2018).…”

mentioning

confidence: 99%

Quantification of Groundwater Nitrate Loading after Raspberry Field Renovation Using High‐Resolution Passive Diffusion Sampling

et al. 2019

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The Abbotsford-Sumas Aquifer is a permeable, unconfined aquifer in British Columbia, Canada, where raspberry (Rubus idaeus L.) production is an important source of groundwater NO 3 contamination. Renovation of raspberry fields (i.e., canes chopped, soil tilled and fumigated, and spring manure application prior to replanting), which typically occurs every 6 to 10 yr in response to decreased crop vigor, has been suggested as a possible cause of significant interannual variation in groundwater NO 3 concentrations. This study used high-resolution passive diffusion sampling to quantify the magnitude and timing of NO 3 loading to shallow groundwater from a commercial raspberry field during a 6-yr (2009-2015) monitoring period after crop renovation. After renovation, the annual NO 3 loading increased from ?95 kg N ha −1 in Year 1 to ?245 kg N ha −1 in Year 2 and decreased to ?85 kg N ha −1 in Year 3. The average annual NO 3 loading from Years 4 to 6 (72 kg N ha −1 ) was assumed to reflect annual loading without a renovation effect, and the increased loading during Years 1 to 3 was attributed to renovation. Renovation contributed an estimated 33 to 23% of total groundwater NO 3 from this field for a 6-to 10-yr renovation cycle. Most of the NO 3 loading associated with renovation occurred in Year 2 and was attributed to the manure application. The increased NO 3 loading after renovation likely contributes to the spatial and temporally varying NO 3 patterns observed in the aquifer. Reducing manure applications during renovation and decreasing renovation frequency have the potential to decrease the groundwater NO 3 concentration.

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Co‐occurrence of Nitrate with Other Contaminants in the Environment

2020

Geophysical Monograph Series

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Landscape indicators of groundwater nitrate concentrations: an approach for trans‐border aquifer monitoring

Cited by 16 publications

References 57 publications

Factors affecting the spatial pattern of nitrate contamination in Texas aquifers

Factors affecting the spatial pattern of nitrate contamination in Texas aquifers

Quantification of Groundwater Nitrate Loading after Raspberry Field Renovation Using High‐Resolution Passive Diffusion Sampling

Co‐occurrence of Nitrate with Other Contaminants in the Environment

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