Effect of salinity and inorganic nitrogen concentrations on nitrification and denitrification rates in intertidal sediments and rocky biofilms of the Douro River estuary, Portugal

Magalhães, Catarina; Joye, Samantha B.; Moreira, Rosa M.; Wiebe, W. J.; Bordalo, Adriano A.

doi:10.1016/j.watres.2005.03.008

Cited by 173 publications

(102 citation statements)

References 27 publications

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“…Factors found to be correlated with denitrification rate in other studies, such as nitrate concentration (Davidsson and Leonardson 1998;Hasegawa and Okino 2004), temperature (Pribyl et al 2005) and organic matter content (Saunders and Kalff 2001) did not show significant correlations in our study. A direct effect of salinity on denitrification rates is not likely (Magalhães et al 2005;Fear et al 2007). Like denitrification rate also pore water nutrients were dependent on water level, although again the effects of vegetation and water level are interacting.…”

Section: Discussionmentioning

confidence: 99%

Nutrient Cycling and Retention Along a Littoral Gradient in a Dutch Shallow Lake in Relation to Water Level Regime

Sollie

Verhoeven

2008

Water Air Soil Pollut

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Littoral zones are characterized by gradients in depth and vegetation biomass, influencing nutrient retention capacity. A field experiment was conducted in a Phragmites australis dominated littoral zone to investigate nutrient retention and its effect on surface water quality. Measurements were done in mesocosms where water levels could be manipulated. Nutrient status was investigated along a gradient perpendicular to the shore during two growing seasons, one with a stable water level and one with a gradually decreasing water level. Nutrient concentrations in sediment, soil pore water and surface water were significantly lower in the vegetated than in the unvegetated zone. The negative correlations of nutrients in sediment and water, with nutrient contents of the vegetation suggest a direct effect of the vegetation. Nutrient uptake and biomass of the vegetation was higher in continuously flooded soils than in seasonally emerging sediments higher along the littoral gradient, probably due to the increased salinity in drained zones. Denitrification rate was highest in the unvegetated zone and was positively related to water level. Flooded littoral zones did result in a higher nutrient retention than drained zones. On small scale, for an optimal nutrient retention a fluctuating regime is not necessarily better suited than a stable water level, but on a larger scale it can substantially increase the width of the vegetated zone. It is important to optimize conditions for helophyte growth since the positive effect of vegetation on nutrient retention, at least at local scale, has been demonstrated in this study.

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Section: Discussionmentioning

confidence: 99%

Nutrient Cycling and Retention Along a Littoral Gradient in a Dutch Shallow Lake in Relation to Water Level Regime

Sollie

Verhoeven

2008

Water Air Soil Pollut

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“…Numerous studies have examined the factors that influence different pathways involved in denitrification, such as nitrate (Magalhães et al 2005), carbon availability (Henderson et al 2010), pH (Liu et al 2010), and copper concentration (Magalhães et al 2011;Felgate et al 2012). Nevertheless, compaction, as a physical factor, has not received as much attention as the above chemical factors associated with denitrification.…”

Section: Introductionmentioning

confidence: 99%

Compaction stimulates denitrification in an urban park soil using 15N tracing technique

Deng

Rensing

et al. 2013

Environ Sci Pollut Res

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Soils in urban areas are subjected to compaction with accelerating urbanization. The effects of anthropogenic compaction on urban soil denitrification are largely unknown. We conducted a study on an urban park soil to investigate how compaction impacts denitrification. By using 15 N labeling method and acetylene inhibition technique, we performed three coherent incubation experiments to quantify denitrification in compacted soil under both aerobic and anaerobic conditions. Uncompacted soil was set as the control treatment. When monitoring soil incubation without extra substrate, higher nitrous oxide (N 2 O) flux and denitrification enzyme activity were observed in the compacted soil than in the uncompacted soil. In aerobic incubation with the addition of K 15 NO 3 , N 2 O production in the compacted soil reached 10.11 ng N h −1 g −1 as compared to 0.02 ng N h −1 g −1 in the uncompacted soil. Denitrification contributed 96 % of the emitted N 2 O in the compacted soil and 36 % of the emitted N 2 O in the uncompacted soil; total denitrification rate was higher in the compacted soil (up to 79.35 ng N h −1 g −1 ) than in the uncompacted soil (0.11 ng N h −1 g −1 ). Under anaerobic incubation with the addition of K 15 NO 3 , no statistical difference in total N losses and 15 N-(N 2 O+N 2 ) flux between the uncompacted soil and the compacted soil was detected. Compaction promoted soil denitrification and may impact urban N biogeochemical cycling.

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“…de Wilde and de Bie, 2000;Garnier et al, 2006;2008-8-6 1 Magalhaes et al, 2005;Xu et al, 2005). Transformation of nitrogen species from ammonia and nitrite to nitrate in river/estuaries during transportation not only modulates their relative distributions but also enhances oxygen consumption (e.g.…”

Section: Introductionmentioning

confidence: 99%

Nitrification and inorganic nitrogen distribution in a large perturbed river/estuarine system: the Pearl River Estuary, China

Dai

Wang²,

Guo³

et al. 2008

Biogeosciences

213

176

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Abstract. We investigated the spatial distribution and seasonal variation of dissolved inorganic nitrogen in a large perturbed estuary, the Pearl River Estuary, based on three cruises conducted in winter (January 2005), summer (August 2005) and spring (March 2006). On-site incubation was also carried out for determining ammonium and nitrite oxidation rates (nitrification rates). We observed a year-round pattern of dramatic decrease in NH , accompanied by extremely high concentrations of ammonia (up to >800 µmol L −1 ) and nitrate (up to >300 µmol L −1 ). In summer, the upper estuary showed higher nitrification rates (ammonia oxidation rate ∼1.5-33.1 µmol N L −1 d −1 , nitrite oxidation rate ∼0.6-32.0 µmol N L −1 d −1 ) with lower concentrations of ammonia (<350 µmol L −1 ) and nitrate (<120 µmol L −1 ). The Most Probable Number test showed relatively lower nitrifier abundance in summer at most sampling stations, indicating a greater specific nitrification rate per cell in the warm season. Temperature appeared to control nitrification rates to a large degree in different seasons. Spatial variability of nitrification rates appeared to be controlled by a combination of many other factors such as nutrient concentrations, nitrifier abundance and dissolved oxygen (DO) concentrations. In addition to aerobic respiration, nitrification contributed significantly to the consumption of DO and production of free CO 2 at upper estuary. Nitrification-induced consumption accounted for up to approximately one third of the total waCorrespondence to: M. Dai (mdai@xmu.edu.cn) ter column community DO consumption in the upper estuary during the surveyed periods, boosting environmental stress on this large estuarine ecosystem.

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Effect of salinity and inorganic nitrogen concentrations on nitrification and denitrification rates in intertidal sediments and rocky biofilms of the Douro River estuary, Portugal

Cited by 173 publications

References 27 publications

Nutrient Cycling and Retention Along a Littoral Gradient in a Dutch Shallow Lake in Relation to Water Level Regime

Nutrient Cycling and Retention Along a Littoral Gradient in a Dutch Shallow Lake in Relation to Water Level Regime

Compaction stimulates denitrification in an urban park soil using 15N tracing technique

Nitrification and inorganic nitrogen distribution in a large perturbed river/estuarine system: the Pearl River Estuary, China

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