Hydrologic control on redox and nitrogen dynamics in a peatland soil

Rubol, S.; Silver, Whendee L.; Bellin, Alberto

doi:10.1016/j.scitotenv.2012.05.073

Cited by 69 publications

(55 citation statements)

References 41 publications

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“…The observation that precipitation triggers soil N 2 O efflux suggests that precipitation influences key physical and chemical properties that promote N 2 O efflux. These responses include increasing soil moisture content, reducing O 2 concentration due to water occupying some of the soil pore spaces that result in low redox potential [Li et al, 1992;Liptzin and Silver, 2009;Rubol et al, 2012]. In the IW and OW, there was very little variation in soil moisture but much more variation in soil N 2 O efflux (as indicated by the coefficients of dispersion), which suggests that precipitation may be the mechanism that controls soil N 2 O flux.…”

Section: 1002/2015jg003027mentioning

confidence: 99%

“…Precipitation‐induced saturation of soils results in low O 2 concentrations, causing low redox potentials that favor N 2 O production, and prolonged saturation can lead to further reduction of N 2 O to N 2 [ Gambrell and Patrick , ] (Figure ). Several studies have reported increased N 2 O production with increased precipitation using modeling techniques [ Li et al ., ], laboratory experiments [ Rubol et al ., ; Hall et al ., ], and field experiments [ Vilain et al ., ]. Precipitation that reaches the forest floor is redistributed due to topography [ Zhu et al ., ], and so topography plays an important role in regulating not only soil nutrient pools but also soil temperature, moisture, and redox, thereby influencing microbial biomass and N cycling processes [ Ambus , ; Hazlett and Foster , ; Gu et al ., ; Stewart et al ., ].…”

Section: Introductionmentioning

confidence: 99%

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Summer storms trigger soil N₂O efflux episodes in forested catchments

et al. 2016

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Climate change and climate-driven feedbacks on catchment hydrology and biogeochemistry have the potential to alter the aquatic versus atmospheric fate of nitrogen (N) in forests. This study investigated the hypothesis that during the forest growth season, topography redistributes water and water-soluble precursors (i.e., dissolved organic carbon and nitrate) for the formation of gaseous N species. Soil nitrous oxide (N 2 O) and nitrogen (N 2 ) efflux and soil physical and chemical properties were measured in a temperate forest in Central Ontario, Canada from 2005 to 2010. Hotspots and hot moments of soil N 2 O and N 2 efflux were observed in topographic positions that accumulate precipitation, which likely triggered the formation of redox conditions and in turn intercepted the conversion of nitrate N flowing to the stream by transforming it to N 2 O and N 2 . There was a strong relationship between precipitation and N 2 O efflux (y = 0.44x 1.22 , r 2 = 0.618, p < 0.001 in the inner wetland; y = 1.30x 1.16 r 2 = 0.72, p < 0.001 in the outer wetland) and significantly different N 2 :N 2 O ratios in different areas of the wetland (19.6 in the inner wetland and 10.1 in the outer wetland). Soil N 2 O + N 2 efflux in response to precipitation events accounted for 16.1% of the annual N input. A consequence of the higher frequency of extreme precipitation events predicted under climate change scenarios is the shift from an aquatic to atmospheric fate for N, resulting in a significant forest N efflux. This in turn creates feedbacks for even warmer conditions due to increased effluxes of potent greenhouse gases.

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Section: 1002/2015jg003027mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Summer storms trigger soil N₂O efflux episodes in forested catchments

et al. 2016

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“…The water content can strongly affect the oxygen concentration in the soil (Silver et al, 1999), usually the oxygen concentration is unevenly distributed along with the soil profile in the vadose zone. Under natural conditions, due to the changes in soil moisture over time, the oxygen concentration could change dynamically at a time scale of hours to days (Rubol et al, 2012). When oxygen is depleted, facultative bacteria can survive using nitrate as the electron acceptor, which may result in an increased proportion of denitrifiers in the microbial community or an unchanged microbial community with activated or newly synthesized denitrification enzymes.…”

Section: Introductionmentioning

confidence: 99%

Organic carbon availability limiting microbial denitrification in the deep vadose zone

Chen

Wang

Zhang

et al. 2018

Environmental Microbiology

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Summary Microbes in the deep vadose zone play an essential role in the mitigation of nitrate leaching; however, limited information is available on the mechanisms of microbial denitrification due to sampling difficulties. We experimentally studied the factors that affect denitrification in soils collected down to 10.5 meters deep along the soil profile. After an anoxic pre‐incubation, denitrification rates moderately increased and the N2O/(N2O + N2) ratios declined while the microbial abundance and diversity did not change significantly in most of the layers. Denitrification rate was significantly enhanced and the abundance of the denitrification genes was simultaneously elevated by the increased availability of organic carbon in all studied layers, to a greater extent in the subsurface layers than in the surface layers, suggesting the severe scarcity of carbon in the deep vadose zone. The genera Pseudomonas and Bacillus, which are made up of a number of species that have been previously identified as denitrifiers in soil, were the major taxa that respond to carbon addition. Overall, our results suggested that the limited denitrification in the deep vadose zone is not because of the lack of denitrifiers, but due to the low abundance of denitrifiers which is caused by low carbon availability.

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“…We also observed temporal variation of emissions from each position. High spatial and temporal variability of fluxes seems to be typical for N2O and has been observed in both mineral and organic soils [7][8][9]27,30,37,38,40]. Characteristically large temporal variations of N2O emissions have also reported in a review paper by Henault et al (2012) [45].…”

Section: N2o Emissions Varying With Water Tablementioning

confidence: 79%

“…N 2 O emissions follow a bell-shaped distribution with the peak at intermediate soil moisture [7]. Experiments show that variation in soil oxygen content induces high N 2 O emissions [8]. Lower soil nitrate levels have been observed during the flooding periods, whereas a peak in N 2 O emissions followed by a sudden drop has been observed as an after-effect of flooding [9].…”

Section: Introductionmentioning

confidence: 93%

Natural Nitrogen Isotope Ratios as a Potential Indicator of N2O Production Pathways in a Floodplain Fen

Masta

Sepp

Pärn

et al. 2020

Water

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Nitrous oxide (N2O), a major greenhouse gas and ozone depleter, is emitted from drained organic soils typically developed in floodplains. We investigated the effect of the water table depth and soil oxygen (O2) content on N2O fluxes and their nitrogen isotope composition in a drained floodplain fen in Estonia. Measurements were done at natural water table depth, and we created a temporary anoxic environment by experimental flooding. From the suboxic peat (0.5–6 mg O2/L) N2O emissions peaked at 6 mg O2/L and afterwards decreased with decreasing O2. From the anoxic and oxic peat (0 and >6 mg O2/L, respectively) N2O emissions were low. Under anoxic conditions the δ15N/δ14N ratio of the top 10 cm peat layer was low, gradually decreasing to 30 cm. In the suboxic peat, δ15N/δ14N ratios increased with depth. In samples of peat fluctuating between suboxic and anoxic, the elevated 15N/14N ratios (δ15N = 7–9‰ ambient N2) indicated intensive microbial processing of nitrogen. Low values of site preference (SP; difference between the central and peripheral 15N atoms) and δ18O-N2O in the captured gas samples indicate nitrifier denitrification in the floodplain fen.

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Hydrologic control on redox and nitrogen dynamics in a peatland soil

Cited by 69 publications

References 41 publications

Summer storms trigger soil N₂O efflux episodes in forested catchments

Summer storms trigger soil N₂O efflux episodes in forested catchments

Organic carbon availability limiting microbial denitrification in the deep vadose zone

Natural Nitrogen Isotope Ratios as a Potential Indicator of N2O Production Pathways in a Floodplain Fen

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Hydrologic control on redox and nitrogen dynamics in a peatland soil

Cited by 69 publications

References 41 publications

Summer storms trigger soil N2O efflux episodes in forested catchments

Summer storms trigger soil N2O efflux episodes in forested catchments

Organic carbon availability limiting microbial denitrification in the deep vadose zone

Natural Nitrogen Isotope Ratios as a Potential Indicator of N2O Production Pathways in a Floodplain Fen

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Summer storms trigger soil N₂O efflux episodes in forested catchments

Summer storms trigger soil N₂O efflux episodes in forested catchments