Effects of nitrate and organic carbon additions on denitrification in two artificially flooded soils

Davidsson, Torbjörn; Leonardson, Lars

doi:10.1016/0925-8574(96)00012-2

Cited by 16 publications

(5 citation statements)

References 24 publications

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“…In such circumstances, denitrification is more dependent on nitrate availability. Similar observations have been made by Davidsson and Leonardson (1996) using peaty and sandy soil in which NO − 3 has been shown to be a stronger regulator of denitrification than organic carbon.…”

Section: Resultssupporting

confidence: 75%

Nitrate levels modulate denitrification activity in tropical mangrove sediments (Goa, India)

Fernandes

Bharathi

2010

Environ Monit Assess

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A study to examine the short-term effect of nitrate and organic carbon addition on denitrification activity was carried out on sediments from a mangrove ecosystem prone to anthropogenic activities (Divar, Goa, India). Laboratory microcosms were prepared using sediment sectioned at every 2-cm-depth interval from the surface to 10 cm. The incubations were subjected to varying nitrate amendments at concentrations ranging from 0, 5, 10, 20, 40 to 60 μmol l(-1) (up to three times more than measured in field). Nitrous oxide production rates increased significantly (n=15; p<0.001) on addition of the nutrient at all depths investigated indicating that denitrification in mangrove sediments was NO[Formula: see text] limited. Incubations amended with organic carbon were prepared using glucose as a substrate with concentrations ranging from 0%, 0.1%, 0.3%, 0.5%, 0.75% to 1%. No significant increase in N2O production was observed on organic C addition. When both the substrates were in excess (1 mmol KNO3+1 mmol glucose), potential denitrification rates decreased with depth and were up to 38 times higher than the in situ denitrification activity varying from 81.26 to 304.09 μmol N2O-N m(-2) h(-1). These results reveal that mangrove sediments could act as a sink for nitrate and microbially mediated denitrification could effectively reduce N load controlling any adverse environmental impact in the adjoining estuarine system.

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Section: Resultssupporting

confidence: 75%

Nitrate levels modulate denitrification activity in tropical mangrove sediments (Goa, India)

Fernandes

Bharathi

2010

Environ Monit Assess

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“…Ϫ , with the mixed nitrate then transported to an underlying zone where it is denitrified. Since we observed denitrification before the oxygen was totally consumed, probably due to spatial heterogeneity, this assumption was not totally fulfilled, i.e., 14…”

Section: Discussionmentioning

confidence: 90%

“…In the laboratory experiment, the inflow had a Tot-N concentration of about 200 M and the outflow concentration more than doubled in the peaty soil and significantly decreased in the sandy soil. The explanation for this discrepancy is that the effectiveness of nitrogen removal is dependent on the nitrate concentration as discussed above and elsewhere (14). Probably, the peaty soil has a much higher nitrate removal potential than was expressed; a higher concentration would lead to a shift from net release to net removal, whereas a higher nitrate concentration in the sandy soil probably would have a smaller effect on Tot-N removal.…”

Section: Discussionmentioning

confidence: 95%

Vertical Patterns of Nitrogen Transformations during Infiltration in Two Wetland Soils

Davidsson¹,

Stepanauskas²,

Leonardson³

1997

Appl Environ Microbiol

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The 15 N isotope dilution and pairing methods were applied to investigate the vertical distribution of nitrogen transformations during infiltration in one peaty soil and one sandy soil. Water containing 15 N-nitrate (99.9%; 200 M) as the only nitrogen fraction was infiltrated through cores containing homogenized soil, with lengths varying from 5.5 to 38 cm. Oxygen and nitrogen dynamics were investigated by measuring inflowing and outflowing water. The experimental design allowed determinations of vertical profiles of aerobic respiration, nitrification, and coupled and uncoupled denitrification and ammonification. In the sandy soil, all oxygen was consumed in the upper 14 cm and nitrate was subsequently consumed and removed, up to a maximum of 70% in the longest core (28 cm). In the peaty soil, oxygen was consumed in the upper 7.5 cm and all nitrate was denitrified in the top 20 cm. In both soils, nitrogen removal by denitrification was counteracted by the release of ammonium and dissolved organic nitrogen. In the sandy soil, net nitrogen removal occurred in cores of 14 cm and longer; in the longest core, 40% was removed. In the peaty soil, release was equal to removal in the top 14 cm but release exceeded removal in the deeper layers, leading to a 100% increase of total nitrogen in the effluent water from the longest core (38 cm).

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“…Flooded soil has the potential losses of N due to high levels of denitrification a major source of greenhouse gases (Reddy 1990;Bei et al 2013;Zhou 2020). Saturation of water due to flooding affects the supply of oxygen within soil and oxygen is generally decreased (Davidsson 1996;Pu et al 2002). Oxygen is the main factor to regulate denitrification, soil nitrification and when there is a lower supply of oxygen the second important factor is NO 3 − N as an external source, which requires a larger amount of energy, and with the lack of C and energy sources this can prove detrimental (Kozlowski 1984;Davidson et al 1996;Zhou 2020).…”

Section: Floodsmentioning

confidence: 99%

The variation and trends of nitrogen cycling and nitrogen isotope composition in tree rings: the potential for fingerprinting climate extremes and bushfires

Succarie

Wang

2022

J Soils Sediments

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Purpose Climate extremes, such as droughts and floods, have become intensified and more frequent due to intensifying climate change. Increased atmospheric carbon dioxide (CO2) and warming-induced water limitation, as well as climate extremes, may alter carbon (C) and nitrogen (N) cycling in forest ecosystems. This provides a brief review of stable nitrogen isotopic composition (δ15N) in tree ring in relation to climate extremes and bushfires in context of N availability and losses in forest ecosystems. Material and methods Tree rings were extracted from four Pinus sylvestris and four Larix gmelinii sample trees, located in a boreal plantation forest of Mohe City, Heilongjiang Province, China. Tree rings were measured to obtain mean annual basal area increment (BAI), while tree ring δ15N and total N concentrations were measured on mass spectrometer at 3-year intervals. The tree ring δ15N data were related to possible climate extremes and bushfires. A brief review of the relevant literature was also undertaken to support our preliminary research findings. Results and discussion Globally, increasing atmospheric CO2 concentration and water limitations have led to a warmer-drier climate. This has also been associated with increases of climate extremes such as drought and floods as well as bushfires. These extremes have been recorded with detrimental effects on plant and soil structures within forest ecosystems and play an important role in regulating N availability and losses in forest ecosystems. Studies of N deposition within forest ecosystems using soil and plant δ15N also showed that N losses under various climate extremes can occur through direct changes in N cycling, such as increasing soil nitrification and denitrification or leaching. It is highlighted that tree rings δ15N has the potential to fingerprint the intensity and frequency of climate extremes and bushfires in the forest ecosystems, but more such tree ring δ15N research needs to be done in diversified forest ecosystems to confirm the potential of using tree ring δ15N for quantifying the frequency and intensity of climate extremes and bushfires at both regional and global scale. Conclusion The variation and trend of δ15N in the soil–plant-climate systems are closely linked to the N cycling in forest ecosystems, and tree ring δ15N has the great potential to fingerprint both intensity and frequency of climate extremes such as drought and floods as well as bushfires.

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Effects of nitrate and organic carbon additions on denitrification in two artificially flooded soils

Cited by 16 publications

References 24 publications

Nitrate levels modulate denitrification activity in tropical mangrove sediments (Goa, India)

Nitrate levels modulate denitrification activity in tropical mangrove sediments (Goa, India)

Vertical Patterns of Nitrogen Transformations during Infiltration in Two Wetland Soils

The variation and trends of nitrogen cycling and nitrogen isotope composition in tree rings: the potential for fingerprinting climate extremes and bushfires

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