Effect of bioclogging on the nitrate source and sink function of a hyporheic zone

Ping, Xue; Jin, Menggui; Xian, Yang

doi:10.1016/j.jhydrol.2020.125425

Cited by 22 publications

(18 citation statements)

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“…Conceptually, in heterogeneous streambed sediments, POC would also be deposited in the shallow streambed, reduce sediment permeability, block nutrient intrusion, and stimulate microbial growth, resulting in the shallow portion of streambeds with low permeability and high rates of biogeochemical reactions (Mendoza‐Lera et al., 2019; Sunjidmaa et al., 2022; Xian et al., 2022). In the deep streambed, biogeochemical reactions are relatively weak due to the scarcity of nutrients and microbial communities caused by sediment clogging (Caruso et al., 2017; Ping et al., 2020). Furthermore, across different types of streambed morphodynamics and sediment grain size distributions, the overall function of deposited POC pools on the physical and biogeochemical conditions of HZs should be further tracked in future studies.…”

Section: Discussionmentioning

confidence: 99%

Effect of Particulate Organic Carbon Deposition on Nitrate Reduction in the Hyporheic Zone

Ping

Xian

Jin

2023

Water Resources Research

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The hyporheic zone (HZ), where surface water and groundwater interact in sediments beneath streams, presents unique conditions for nutrient dynamics, such as carbon and nitrogen (N) cycling. Organic carbon (OC) in aquatic systems has two distinct forms: dissolved organic carbon and particulate organic carbon (POC). OC affects N reduction and controls the occurrence of denitrification, a primary process by which nitrate (NO3−) is removed as gas (N2 or N2O) to the atmosphere. When POC is the predominant form of OC in streams, how POC influences NO3− reduction within a HZ remains unclear. We established a new reactive transport model incorporating POC transport and filtration processes to assess how POC deposition affects NO3− removal. Sediment permeability decreases as POC is filtrated in the streambed. Nitrate influx is reduced due to POC‐induced sediment clogging. The deposited POC in the shallow streambed serves as an OC source and supports higher biogeochemical reaction kinetics because OC is an important substrate promoting microbial activities. The filtrated POC pool enhances denitrification, thus causing a higher NO3− removal efficiency. In contrast, the POC pool is typically assumed to be distributed homogeneously in sediments, potentially causing a significant underestimation of stream‐borne NO3− removal. A lower hydraulic conductivity, a smaller POC grain size, and a larger POC filtration efficiency and in‐stream POC concentration allow for extensive POC deposition within the shallow streambed that favors nitrate removal. This study provides a better understanding of N processing and an accurate estimation of NO3− removal potential in HZs.

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Section: Discussionmentioning

confidence: 99%

Effect of Particulate Organic Carbon Deposition on Nitrate Reduction in the Hyporheic Zone

Ping

Xian

Jin

2023

Water Resources Research

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“…Marks et al (2016) found that pulses of intermediate salinity (15 ppt) water stimulated denitrification rates in the fresh marsh soil by 75%, while full salinity seawater (35 ppt) suppressed potential denitrification by 73% for 11 d. Tsuneda et al (2005) suggested that the salt concentration should be maintained below 3.0% to suppress N 2 O emissions in an anoxic-oxic activated sludge process. Future study should take into consideration the growth of heterotrophic and autotrophic biomass and sensitivity of denitrifying microbial consortia to the salinity of wastewater in the nitrogen cycling processes (Caruso et al, 2017;Ping et al, 2020).…”

Section: Limitations Of the Studymentioning

confidence: 99%

N₂O Production and Consumption Processes in a Salinity‐Impacted Hyporheic Zone

et al. 2021

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Nitrous oxide (N 2 O) is a potent greenhouse gas and contributes significantly to the destruction of the stratospheric ozone (Ravishankara et al., 2009). However, its concentration in the atmosphere has grown by approximately 20% since 1750 and will continue to increase at an annual rate of 0.2%-0.3% in years to come (Quick et al., 2019). Rivers with excess nitrogen resulting from human activities such as sewage effluents and agricultural practices have become an important contributor to the global N 2 O budget (Beaulieu et al., 2011) and an active source of N 2 O emissions (Yao et al., 2020).Considerable attempts have been made to quantify the regional and global N 2 O emissions from rivers based on watershed-scale measurements and numerical models (Marzadri et al., 2017;McMahon &

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“…Previous studies have widely investigated the N dynamics in HZs driven by "pumping" process (Bardini et al, 2012;Caruso et al, 2017;Hester et al, 2014Hester et al, , 2019Ping et al, 2020;Zheng et al, 2016), but the "turnover" process induced by bed migration is typically neglected. In fact, bedform migration can strongly increase hyporheic exchange flux (HEF), alter flow field and oxygen dynamics, and in turn influence nitrate reduction in streambeds (Ahmerkamp et al, 2016(Ahmerkamp et al, , 2017Harvey et al, 2012;Precht et al, 2004;Rutherford et al, 1993;Teitelbaum et al, 2021Teitelbaum et al, , 2022Wolke et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Influence of Bedform Migration on Nitrate Reduction in Hyporheic Zones of Heterogeneous Sediments

Ping

Xian

Jin

2022

Water Resources Research

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Effect of bioclogging on the nitrate source and sink function of a hyporheic zone

Cited by 22 publications

References 86 publications

Effect of Particulate Organic Carbon Deposition on Nitrate Reduction in the Hyporheic Zone

Effect of Particulate Organic Carbon Deposition on Nitrate Reduction in the Hyporheic Zone

N₂O Production and Consumption Processes in a Salinity‐Impacted Hyporheic Zone

Influence of Bedform Migration on Nitrate Reduction in Hyporheic Zones of Heterogeneous Sediments

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Effect of bioclogging on the nitrate source and sink function of a hyporheic zone

Cited by 22 publications

References 86 publications

Effect of Particulate Organic Carbon Deposition on Nitrate Reduction in the Hyporheic Zone

Effect of Particulate Organic Carbon Deposition on Nitrate Reduction in the Hyporheic Zone

N2O Production and Consumption Processes in a Salinity‐Impacted Hyporheic Zone

Influence of Bedform Migration on Nitrate Reduction in Hyporheic Zones of Heterogeneous Sediments

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N₂O Production and Consumption Processes in a Salinity‐Impacted Hyporheic Zone