Migration and transformation rule of nitrogen in vadose zone and groundwater: A case of Hebei plain

Gao, Taizhong; Pang, Huicong; Zhang, Jing; Zhang, Hao; Zhou, Jianwei

doi:10.1109/iceceng.2011.6058431

Cited by 2 publications

(3 citation statements)

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“…The determination of soil mineral N patterns and variability is extremely important for agricultural management and planning [ 39 , 40 ]. Knowledge about the N content in the soil is also important for hydrogeological modeling and predictive analysis of N fate and transport [ 41 , 42 ]. Continuous development of modeling techniques and the widespread use of computational programs make it possible to solve most of the environmental tasks, including estimation of the extent of pollutant or nutrients migration.…”

Section: Introductionmentioning

confidence: 99%

The Variability of Nitrogen Forms in Soils Due to Traditional and Precision Agriculture: Case Studies in Poland

Podlasek

Koda

Vaverková

2021

IJERPH

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The soil and human health issues are closely linked. Properly managed nitrogen (N) does not endanger human health and increases crop production, nevertheless when overused and uncontrolled, can contribute to side effects. This research was intended to highlight that there is a need for carrying out monitoring studies in agricultural areas in order to expand the available knowledge on the content of N forms in agricultural lands and proper management in farming practice. The impact of two types of fertilization, concerning spatially variable (VRA) and uniform (UNI) N dose, on the distribution of N forms in soils was analyzed. The analysis was performed on the basis of soil monitoring data from agricultural fields located in three different experimental sites in Poland. The analyses performed at selected sites were supported by statistical evaluation and recognition of spatial diversification of N forms in soil. It was revealed that the movement of unused N forms to deeper parts of the soil, and therefore to the groundwater system, is more limited due to VRA fertilization. Finally, it was also concluded that the management in agricultural practice should be based on the prediction of spatial variability of soil properties that allow to ensure proper application of N fertilizers, resulting in the reduction of possible N losses.

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Section: Introductionmentioning

confidence: 99%

The Variability of Nitrogen Forms in Soils Due to Traditional and Precision Agriculture: Case Studies in Poland

Podlasek

Koda

Vaverková

2021

IJERPH

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“…Especially in the saturated zone (5-49 m), the percentage was more than 95%. (5) In the O 2 /NO 3 − reduction zone, the proportions of adsorption and biotransformation were 20.7% and 79.3%, indicating mainly the HN-AD process to transform NH 4 + . In the Fe/Mn reduction zone, the proportions of adsorption and biotransformation were 3.6% and 96.4%.…”

Section: Discussionmentioning

confidence: 93%

“…The pollution proportion and area are increasing year by year, which means NH 4 + pollution in groundwater has been a global environmental hot issue and has been attracting wide attention [3,4]. Although NH 4 + is a vital nutrient for aquatic plants, it can also lead to eutrophication and a decrease in water's dis-solved oxygen (DO) [5,6]. NO 3 − and NO 2 − , as the main forms of NH 4 + transformation in groundwater, will lead to increased human hemoglobin denaturation and loss of oxygen transport capacity [7].…”

Section: Introductionmentioning

confidence: 99%

Ammonium Reactive Migration Process and Functional Bacteria Response along Lateral Runoff Path under Groundwater Exploitation

Shi

Zhai

et al. 2022

Sustainability

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In order to elucidate the importance of biogeochemical interactions between NH4+ and aquifer media in groundwater runoff paths, a dynamic monitoring section in the riverbank zone, which is most sensitive to environmental characteristics and perpendicular to the flow direction of the Songhua River in northeastern China, was selected for field experiments in this study. The results indicated that the NH4+ concentration decreased gradually along the groundwater runoff path under exploitation conditions. The NH4+ concentrations of J1, J2, and J3 decreased by 8%, 18%, and 22%, respectively, as compared to the starting concentration of 1.3 mg/L. Adsorption of NH4+ by aquifer media at different depths is a monolayer adsorption process in accordance with pseudo-second-order kinetic equation. The maximum reduction of NH4+ from the aquifer media from top to bottom was 76%, 67%, 56%, and 42%, respectively. The function and activity of dominant functional bacteria have characteristics of coevolution with the NH4+ transformation process. The main genera in the fluctuation zone are Pseudomonas (8.83%) and Acinetobacter (4.37%), which mainly transform NH4+ by heterotrophic nitrification–aerobic denitrification (HN–AD). The main genera in the saturated zone are Flavobacterium (32.60%) and Sphingobium (3.54%), which mainly transform NH4+ by anaerobic denitrification. The spatial variations of species and abundance for NH4+ transformation functional bacteria decrease by 2.74% and 3.47%, respectively, along groundwater runoff paths. In the vertical and horizontal directions of groundwater runoff, the percentage of adsorption in NH4+ transformation gradually decreased and the percentage of biotransformation gradually increased. The adsorption processes in the O2/NO3− reduction, Fe/Mn reduction, and SO42− reduction zones were 20.7%, 3.6%, and 1.0%, respectively. The corresponding proportions of the biotransformation process were 79.3%, 96.4%, and 99.0%. This research is critical for elucidating the bio-geochemical interaction between NH4+ and aquifer media along the course of groundwater runoff in order to offer a scientific basis for the prevention and management of groundwater nitrogen pollution.

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Migration and transformation rule of nitrogen in vadose zone and groundwater: A case of Hebei plain

Cited by 2 publications

References 1 publication

The Variability of Nitrogen Forms in Soils Due to Traditional and Precision Agriculture: Case Studies in Poland

The Variability of Nitrogen Forms in Soils Due to Traditional and Precision Agriculture: Case Studies in Poland

Ammonium Reactive Migration Process and Functional Bacteria Response along Lateral Runoff Path under Groundwater Exploitation

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