Nitrous oxide production and consumption by denitrification in a grassland: Effects of grazing and hydrology

Hu, Jing; Inglett, Kanika S.; Clark, Mark W.; Inglett, Patrick W.; Reddy, K. R.

doi:10.1016/j.scitotenv.2015.06.036

Cited by 23 publications

(13 citation statements)

References 59 publications

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“…The increase–decrease–stable trend of N 2 O emissions observed under the continuously drained condition (Figure c) is possibly attributed to the change of water content in soils with time. The optimal water content for N 2 O emissions is in the range of 70–80% water‐filled pore space depending on soil type (Davidson et al, ; Hu et al, ). Seemingly, the water content in soils under the continuously drained treatment decreased from the saturated condition to the optimal value at day 53–60 when the highest N 2 O emissions were observed.…”

Section: Discussionmentioning

confidence: 99%

Greenhouse Gas Emissions Under Different Drainage and Flooding Regimes of Cultivated Peatlands

VanZomeren

Inglett

et al. 2017

JGR Biogeosciences

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Globally, approximately 10–20% of peatlands have been drained for agricultural purposes. A strategy to protect peatlands and mitigate carbon dioxide (CO2) emissions, while continuing agricultural production, is the use of intermittent flooding and drainage. A potential drawback of this strategy could be increases in methane (CH4) and nitrous oxide (N2O) emissions. The objective of this study was to compare greenhouse gas (GHG) emissions from peatlands under various flooding–drainage cycles. A laboratory study was performed using intact soil cores subjected to different durations of flooding and drainage for 6 months. Average daily emissions of CO2 and N2O were significantly higher (P < 0.001) under drained (667 ± 37 mg CO2–C m−2 d−1 and 135 ± 19 μg N2O–N m−2 d−1) than flooded conditions (86 ± 6 mg CO2–C m−2 d−1 and 48 ± 2 μg N2O–N m−2 d−1). Methane emissions were not influenced by drained/flooded conditions, with an average rate of 116 ± 11 μg CH4–C m−2 d−1. Peaks of CH4 and N2O emissions were observed after flooding events and lasted less than 24 h. The peak emissions were approximately 8 and 19 times higher than the mean CH4 and N2O emissions, respectively. Carbon dioxide was the dominant component of GHGs, irrespective of hydrologic regime, accounting for more than 92% of overall global warming potential. Global warming potential was inversely proportional to the flooding period, indicating that prolonging the flooding period of peatlands would help mitigate soil oxidation and GHG emissions and enhance sustainability of these agricultural peatlands.

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Section: Discussionmentioning

confidence: 99%

Greenhouse Gas Emissions Under Different Drainage and Flooding Regimes of Cultivated Peatlands

VanZomeren

Inglett

et al. 2017

JGR Biogeosciences

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“…Most studies showed that denitrification and the production of N 2 O increases with increasing moisture content (Groffman, 2012;Hu et al, 2015) and the availability of nitrate in soils (Groffman and Tiedje, 1989;Burgin et al, 2009). Our study, however, suggests that soil moisture content and NO 3 -N are likely to work together to regulate soil denitrification.…”

Section: Seasonal Patterns Of Potential Denitrificationmentioning

confidence: 99%

Seasonal patterns of nitrogen cycling in subtropical short-hydroperiod wetlands: Effects of precipitation and restoration

Liao

Inglett

2016

Science of The Total Environment

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“…The N 2 O reduction rates were significantly larger for 0-10 cm soils than 30-50 and 50-70 cm soils, averaging 0.065 ± 0.027, 0.026 ± 0.012, 0.004 ± 0.001 and 0.002 ± 0.001 mg N 2 O-N kg −1 hr −1 for 0-10, 10-30, 30-50 and 50-70 cm soils, respectively. Profile N 2 O production and reduction potentials were calculated using rates under ambient conditions with a bulk density of 0.86 mg cm −3 for all soils (Hu et al, 2015). Soil profile N 2 O production potentials decreased significantly (p < .05) in the order of Center, Edge and Upland, while reduction potentials were significantly smaller for Upland than Center and Edge (p < .05).…”

Section: Nitrous Oxide Production and Reduction Under Ambient Condimentioning

confidence: 99%

“…The rates of denitrification in soils exhibit a high degree of variability because of variation in environmental factors, including soil water content, temperature, bioavailable organic carbon (C), NO 3 ‐ , pH, soil texture and redox potential (Bouwman et al, 2013; Hu, Inglett, Clark, Inglett, & Ramesh Reddy, 2015; Hu, Inglett, Wright, & Reddy, 2016; Hu et al., 2017; Liao, Inglett, & Inglett, 2013; Saggar et al., 2013). These factors interact with each other and hierarchically regulate denitrification rates in soils.…”

Section: Introductionmentioning

confidence: 99%

Nitrous oxide dynamics during denitrification along a hydrological gradient of subtropical grasslands

Inglett

Wright

et al. 2020

Soil Use and Management

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Nitrous oxide (N 2 O) dynamics during denitrification, including N 2 O production and reduction, particularly as related to soil depth, are poorly understood. The objective of this study was to investigate the rates of N 2 O production and reduction processes at various soil depths along a hydrological gradient in grazed subtropical grasslands. A batch incubation study was conducted on soils collected along a hydrological gradient representing isolated wetland (Center), transient edge (Edge) and pasture upland (Upland) in south-central Florida. Significantly different N 2 O production and reduction rates between hydrological zones were observed for surface soils (0-10 cm) under ambient conditions, with average N 2 O production rates of 0.368, 0.178 and 0.003 N 2 ON kg −1 dry soil h −1 for Center, Edge and Upland, respectively, and average N 2 O reduction rates of 0.063, 0.132 and 0.002 N 2 ON kg −1 dry soil h −1. Nitrous oxide production and reduction in subsurface soils maintained low rates and showed small variations between depths and hydrological zones. Our results suggest that N 2 O dynamics were affected by depth, mainly through labile organic carbon (C) and microbial biomass C, being influenced by hydrological zone primarily through soil NO 3 content. The spatial distribution of N 2 O fluxes from denitrification along the hydrological gradient is likely attributed to the differences in N 2 O production and reduction in surface soils.

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Nitrous oxide production and consumption by denitrification in a grassland: Effects of grazing and hydrology

Cited by 23 publications

References 59 publications

Greenhouse Gas Emissions Under Different Drainage and Flooding Regimes of Cultivated Peatlands

Greenhouse Gas Emissions Under Different Drainage and Flooding Regimes of Cultivated Peatlands

Seasonal patterns of nitrogen cycling in subtropical short-hydroperiod wetlands: Effects of precipitation and restoration

Nitrous oxide dynamics during denitrification along a hydrological gradient of subtropical grasslands

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