Dissolved gas evidence for denitrification in the Lincolnshire Limestone groundwaters, eastern England

Wilson, George; Andrews, John N.; Bath, Adrian

doi:10.1016/0022-1694(90)90166-u

Cited by 61 publications

(32 citation statements)

References 12 publications

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“…After calculating recharge temperature, the recharge concentration for any gas can be estimated using temperature dependent solubility curves. The difference between measured and recharge N 2 or N 2 O concentrations were assumed to be biogenic N gas (Wilson et al 1990).…”

Section: Gas Transfer Velocitymentioning

confidence: 99%

Balancing watershed nitrogen budgets: accounting for biogenic gases in streams

et al. 2016

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Denitrification is critical for removal of reactive nitrogen (Nr) from ecosystems. However, measuring realistic, scalable rates and understanding the role of denitrification and other dissimilatory processes in watershed nitrogen (N) budgets remains a significant challenge in biogeochemistry. In this study, we focused on the stream reach and network scale in three Mid-Atlantic coastal plain watersheds. We applied open channel methods to measure biogenic N 2 and N 2 O gas fluxes derived from both in-stream and terrestrial nitrogen processing. A large portion of biogenic N 2 flux through streams (33-100 %, mean = 74 %) was a result of groundwater delivery of biogenic N 2 with the remaining portion due to instream N 2 production. In contrast, N 2 O was largely produced in-stream, with groundwater delivery contributing on average 12 % of the total biogenic N 2 O flux. We scaled these measurements across one stream network and compared them to hydrologic Nr export and net anthropogenic N inputs (NANI) to a 4.8 km 2 watershed. The N budget revealed that, during the study period, the biogenic N 2 flux through streams was comparable to the difference between NANI and hydrologic Nr export (i.e. the ''missing'' N). This study provides a methodological and conceptual framework for incorporating terrestrial and in-stream derived biogenic N gas fluxes into watershed N budgets and supports the hypothesis that denitrification is the primary fate of NANI that is not exported in streamflow.

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Section: Gas Transfer Velocitymentioning

confidence: 99%

Balancing watershed nitrogen budgets: accounting for biogenic gases in streams

et al. 2016

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“…The reduction of nitrate is dependent on other nutrients and especially reactive organic carbon (Ottley et al 1997). The main product of denitrifi cation in most aquifers is N 2 gas, as demonstrated by measurement of N 2 /Ar ratios (Wilson et al 1990). …”

Section: Nitrogen Speciesmentioning

confidence: 99%

The Baseline Inorganic Chemistry of European Groundwaters

Shand

Edmunds

2008

Natural Groundwater Quality

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The baseline chemistry of groundwaters varies both spatially and with time due to many complex factors including climate, soil type, geology and residence time. The baseline is therefore represented by a range rather than a single concentration. The variations in baseline groundwater characteristics are presented for a variety of aquifers in Europe including different rock types (from carbonate to siliclastic) and ages (PreCambrian to Quaternary). Most aquifers have been affected to some degree by diffuse pollution and a set of guidelines has been developed to help in the determination of baseline.More than 80 components were measured in these aquifers. Statistical data and plots are useful for comparison between areas and are of strategic value since they include data for elements for which there are no existing guidelines, but which may still be harmful (e.g. Be, Se, Sb, Tl, U). This represents a comprehensive and strategic database of the baseline concentrations for most inorganic substances and a reference to quantify pollution by such substances.There is considerable overlap between the different aquifers for most solutes regardless of main aquifer type. The main hydrochemical characteristics in aquifers are determined, not specifi cally by rock type, but by a range of hydrochemical processes such as mineral dissolution, redox reactions, ion-exchange reactions, mixing, adsorption-desorption and rainfall inputs.

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“…Most studies that have estimated the denitrification capacity of wetlands have inferred nitrate losses based on changes in concentrations of nitrate, N isotopic composition, or other isotopic tracers across a wetland (Wada et al , 1975; Bottcher et al , 1990; Aravena and Robertson, 1998; Tang et al , 2004a; Søvik and Mørkved, 2008). Other studies have estimated the emission of gases during this denitrification process in wetlands (Wilson et al , 1990; Blicher‐Mathiesen et al , 1998; Mookherji et al , 2003). Because transported solutes, including electron donors and acceptors, can significantly impact and control microbial activity, determining changes in microbial community composition can detail the hydrological processes and the delivery of chemicals into wetlands.…”

Section: Introductionmentioning

confidence: 99%

Denitrifying bacteria and hydrogeochemistry in a natural wetland adjacent to farmlands in Chiba, Japan

Zhang

Tang

et al. 2011

Hydrological Processes

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Abstract:This study combined bacterial incubation and hydrogeochemical methods to investigate denitrification in the surface water, top soil (0-20 cm), and shallow groundwater of the Ochi wetland in Japan. Surface water was rich in nitrate (40 mg/l) and denitrifying bacteria (700 per ml). Three functional zones in the wetland were identified in the top soil and shallow groundwater. In the upstream portion of the wetland (Zone I), the counts of denitrifying bacteria in top soil increased from 5200 to 14 970 per ml and nitrate decreased from 25Ð4 to 1Ð8 mg/l. Organic carbon concentrations decreased as sulfate increased from 4Ð0 to 9Ð6 mg/l in this zone. In the middle-stream of the wetland (Zone II), all concentrations of major anions, iron, organic carbon, and total nitrogen content in top soil were relatively constant, but the counts of denitrifying bacteria increased up to 70 200 per ml. In the downstream portion of the wetland (Zone III), complete removal of nitrate resulted in sharp reduction of counts of denitrifying bacteria. Correspondingly, dissolved oxygen (DO), organic carbon, and total nitrogen increased in this zone. Counts of denitrifying bacteria were lower in shallow groundwater than in top soil; nitrate concentrations in shallow groundwater were also very low in this zone. DO and the oxidation/reduction potential data suggest that groundwater flows to the surface along an extended flow path, thus providing nitrate for the denitrifying community.

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Dissolved gas evidence for denitrification in the Lincolnshire Limestone groundwaters, eastern England

Cited by 61 publications

References 12 publications

Balancing watershed nitrogen budgets: accounting for biogenic gases in streams

Balancing watershed nitrogen budgets: accounting for biogenic gases in streams

The Baseline Inorganic Chemistry of European Groundwaters

Denitrifying bacteria and hydrogeochemistry in a natural wetland adjacent to farmlands in Chiba, Japan

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