Short-lived isotopic method to measure nitrous oxide emissions from a soil under four low-fertility management systems

Speir, T. W.; Townsend, John W.; More, R.D.; Hill, L.F.

doi:10.1016/s0038-0717(99)00061-9

Cited by 10 publications

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“…As DNRA occurs under similar low-oxygen conditions as denitrification (Tiedje et al 1982), both processes are in competition for the available NO 3 -and can affect each other (Knowles 1982;Silver et al 2001Silver et al , 2005. Denitrification is next to nitrification the main pathway of nitrous oxide (N 2 O) production in forest ecosystems (Speir et al 1999). Therefore a high DNRA rate has the potential to reduce gaseous N losses (Huygens et al 2007).…”

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“…Therefore a high DNRA rate has the potential to reduce gaseous N losses (Huygens et al 2007). Undisturbed Nothofagus forests are characterized by small N 2 O production from denitrification and no net N 2 O emissions (Price et al 2004;Speir et al 1999). In our previous study (Huygens et al 2007) we compared the rate of DNRA with NO 3 -immobilization and concluded that gaseous N losses via denitrification are presumably low in the studied ecosystem.…”

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Functional role of DNRA and nitrite reduction in a pristine south Chilean Nothofagus forest

et al. 2008

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Nitrite (NO 2 -) is an intermediate in a variety of soil N cycling processes. However, NO 2 -dynamics are often not included in studies that explore the N cycle in soil. Within the presented study, nitrite dynamics were investigated in a Nothofagus betuloides forest on an Andisol in southern Chile. We carried out a 15 N tracing study with six 15 N labeling treatments, including combinations of NO 3 -, NH 4 ? and NO 2 -. Gross N transformation rates were quantified with a 15 N tracing model in combination with a Markov chain Monte Carlo optimization routine. Our results indicate the occurrence of functional links between (1) NH 4? oxidation, the main process for NO 2 -production (nitritation), and NO 2 -reduction, and (2) oxidation of soil organic N, the dominant NO 3 -production process in this soil, and dissimilatory NO 3 -reduction to NH 4 ? (DNRA). The production of NH 4? via DNRA was approximately ten times higher than direct mineralization from recalcitrant soil organic matter. Moreover, the rate of DNRA was several magnitudes higher than the rate of other NO 3 -reducing processes, indicating that DNRA is able to outcompete denitrification, which is most likely not an important process in this ecosystem. These functional links are most likely adaptations of the microbial community to the prevailing pedoclimatic conditions of this Nothofagus ecosystem. Keywords Nothofagus betuloides Á 15 N tracing model Á Nitrite (NO 2 -) Á N retention Á Dissimilatory nitrate reduction to ammonium (DNRA) Á Markov chain Monte Carlo sampling Abbreviations Anammox Anaerobic ammonium oxidation DNRA Dissimilatory nitrate reduction to ammonium GWC Gravimetric water content

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Functional role of DNRA and nitrite reduction in a pristine south Chilean Nothofagus forest

et al. 2008

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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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NO, NO2 and N2O

Gasché¹,

Papen²

2002

Tree Physiology

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Short-lived isotopic method to measure nitrous oxide emissions from a soil under four low-fertility management systems

Cited by 10 publications

References 24 publications

Functional role of DNRA and nitrite reduction in a pristine south Chilean Nothofagus forest

Functional role of DNRA and nitrite reduction in a pristine south Chilean Nothofagus forest

Summer storms trigger soil N₂O efflux episodes in forested catchments

NO, NO2 and N2O

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Short-lived isotopic method to measure nitrous oxide emissions from a soil under four low-fertility management systems

Cited by 10 publications

References 24 publications

Functional role of DNRA and nitrite reduction in a pristine south Chilean Nothofagus forest

Functional role of DNRA and nitrite reduction in a pristine south Chilean Nothofagus forest

Summer storms trigger soil N2O efflux episodes in forested catchments

NO, NO2 and N2O

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Summer storms trigger soil N₂O efflux episodes in forested catchments