Denitrification rates in marsh fringes and fens in two boreal peatlands in Alberta, Canada

Wray, Heather E.; Bayley, Suzanne E.

doi:10.1672/0277-5212(2007)27[1036:drimfa]2.0.co;2

Cited by 33 publications

(31 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, N 2 O fluxes measured temporarily confirm our assumption that in periods of low water level net nitrification also occurs at the undrained site, albeit at a low level. Thus, we conclude that for most of the year denitrification activity is NO For N 2 fluxes no comparable values from the field are available in the literature, but N 2 fluxes observed in the incubation experiment are in the range of other studies from drained and undrained fen ecosystems (e.g., Teiter and Mander, 2005;Wray and Bayley, 2007;Mander et al, 2008;Roobroeck et al, 2010;Soosaar et al, 2011).…”

Section: Factors Controlling Temporal and Site-specific Variation In contrasting

confidence: 62%

“…This requires the presence of efficient electron acceptors (e.g., NO − 3 ) to prevent the reduction of N 2 O to N 2 (Bremner and Blackmer, 1981;Speir et al, 1995;Jungkunst et al, 2004). Due mainly to analytical difficulties in the determination of microbially produced N 2 , to date the denitrification potential from waterlogged peat soils has rarely been estimated (Watts and Seitzinger, 2000;Mander et al, 2003;Teiter and Mander, 2005;Wray and Bayley, 2007;Roobroeck et al, 2010;Soosaar et al, 2011;Uri et al, 2011). The substitution of ambient N 2 by Helium (He) in laboratory studies possibly represents the most reliable method for the direct and simultaneous determination of N 2 O and N 2 exchange rates (Butterbach-Bahl et al, 2002;Roobroeck et al, 2010;Butterbach-Bahl et al, 2013).…”

Section: T Eickenscheidt Et Al: Nitrogen Mineralization and Gaseousmentioning

confidence: 99%

See 1 more Smart Citation

Nitrogen mineralization and gaseous nitrogen losses from waterlogged and drained organic soils in a black alder (<i>Alnus glutinosa</i> (L.) Gaertn.) forest

et al. 2014

View full text Add to dashboard Cite

Abstract. Black alder (Alnus glutinosa (L.) Gaertn.) forests on peat soils have been reported to be hotspots for high nitrous oxide (N 2 O) losses. High emissions may be attributed to alternating water tables of peatlands and to the incorporation of high amounts of easily decomposable nitrogen (N) into the ecosystem by symbiotic dinitrogen (N 2 )-fixation of alder trees. Our study addressed the question to what extent drainage enhances the emissions of N 2 O from black alder forests and how N turnover processes and physical factors influence the production of N 2 O and total denitrification. The study was conducted in a drained black alder forest with variable groundwater tables at a southern German fen peatland. Fluxes of N 2 O were measured using the closed chamber method at two drained sites (D-1 and D-2) and one undrained site (U). Inorganic N contents and net N mineralization rates (NNM) were determined. Additionally a laboratory incubation experiment was carried out to investigate greenhouse gas and N 2 fluxes at different temperature and soil moisture conditions. Significantly different inorganic N contents and NNM rates were observed, which however did not result in significantly different N 2 O fluxes in the field but did in the laboratory experiment. N 2 O fluxes measured were low for all sites, with total annual emissions of 0.51 ± 0.07 (U), 0.97 ± 0.13 (D-1) and 0.93 ± 0.08 kg N 2 O-N ha −1 yr −1 (D-2). Only 37 % of the spatiotemporal variation in field N 2 O fluxes could be explained by peat temperature and groundwater level, demonstrating the complex interlinking of the controlling factors for N 2 O emissions. However, temperature was one of the key variables of N 2 O fluxes in the incubation experiment conducted. Increasing soil moisture content was found to enhance total denitrification losses during the incubation experiment, whereas N 2 O fluxes remained constant. At the undrained site, permanently high groundwater level was found to prevent net nitrification, resulting in a limitation of available nitrate (NO − 3 ) and negligible gaseous N losses. N 2 O flux rates that were up to four times higher were measured in the incubation experiment. They reveal the potential of high N 2 O losses under changing soil physical conditions at the drained alder sites. The high net nitrification rates observed and high NO − 3 contents bear the risk of considerable NO − 3 leaching at the drained sites.

show abstract

Section: Factors Controlling Temporal and Site-specific Variation In contrasting

confidence: 62%

Section: T Eickenscheidt Et Al: Nitrogen Mineralization and Gaseousmentioning

confidence: 99%

Nitrogen mineralization and gaseous nitrogen losses from waterlogged and drained organic soils in a black alder (<i>Alnus glutinosa</i> (L.) Gaertn.) forest

et al. 2014

View full text Add to dashboard Cite

show abstract

“…In addition to microbial uptake, NH 4 ' can also be consumed via volatilization, leaching, mineral fixation and nitrification while NO 3 ( can be consumed via leaching, denitrification and dissimilatory nitrate reduction (Hart et al 1994b). Many of these other processes are often assumed to be insignificant over the small incubation period (Hart et al 1994b), although high denitrification rates have been measured in the peatlands studied in this experiment (Wray and Bayley 2007). Denitrification was measured as part of a companion study using the N-flux technique, which involves incubating cores in gas-tight chambers, flushing out nitrogen and measuring flux of N from the soil to the headspace.…”

Section: Laboratory Proceduresmentioning

confidence: 99%

“…Denitrification was measured as part of a companion study using the N-flux technique, which involves incubating cores in gas-tight chambers, flushing out nitrogen and measuring flux of N from the soil to the headspace. For a more detailed description of these methods see Wray and Bayley (2007). Therefore, we estimated daily microbial immobilization using isotope dilution studies according to the following equations:…”

Section: Laboratory Proceduresmentioning

confidence: 99%

“…On average, net nitrification rates were positive in the floating peatland and were negative in the non-floating peatland; however, these differences were not significant (Table 3). Because high denitrification rates were also measured in these sites (Wray and Bayley 2007), estimates of net nitrification rates were also calculated assuming that all N released via denitrification was derived from the nitrate produced via nitrification in the cores (Table 3). Net ammonification and net nitrification were not different between months in both the floating and nonfloating peatlands (seasonal data not shown).…”

Section: Comparison Of Net and Gross Mineralization Ratesmentioning

confidence: 99%

See 1 more Smart Citation

Nitrogen dynamics in floating and non-floating peatlands in the Western Boreal Plain

Wray¹,

Bayley²

2008

Can. J. Soil. Sci.

View full text Add to dashboard Cite

. 2008. Nitrogen dynamics in floating and non-floating peatlands in the Western Boreal Plain. Can. J. Soil Sci. 88: 697Á708. The overall objective of this study was to measure the major nitrogen pools and fluxes in nutrient-and peat-rich, vegetated marshes and fens surrounding shallow ponds in the Western Boreal Plain (WBP) of Canada. Within the same peatland-pond complex, marshes and fens did not differ from each other in major N fluxes and pool sizes; however, significant differences in N dynamics were measured between different peatland-ponds. Specifically, N cycling rates (gross and net mineralization) were much greater in a floating peatland than in a non-floating peatland. Gross N mineralization rates were 59 and 453 mg N m (2 d (1 in the non-floating and floating peatlands, respectively. Gross ammonification rates were approximately 4Á10 times net rates while gross nitrification rates were 500Á800 times net rates, indicating rapid turnover of extractable inorganic N pools. Increased moisture and carbon in the floating peat supported higher microbial biomass and activity, however net primary production values were lower, presumably due to competition by microbes for available inorganic N. Monthly measurements of N fluxes were combined to provide an estimate of annual internal N cycling within marshes and fens surrounding shallow ponds in the WBP.

show abstract

Spatial variation in nutrient dynamics among five different peatland types in the Alberta oil sands region

et al. 2015

View full text Add to dashboard Cite

Wetlands are found extensively throughout the Western Boreal Plain, a region under pressure because of disturbance by the oil and gas industries. To understand how wetland systems may respond to disturbance and set targets for reclamation efforts, it is necessary to understand natural variability in nutrient dynamics in the landscape. The purpose of this study was to characterize spatial variability in peatland nutrient (nitrogen, N, and phosphorus, P) dynamics in the Athabasca Oil Sands (AOS) region. N and P availability and net mineralization rates in the upper 10 cm layer of peat were examined during the peak growing season in five peatlands that fell along an apparent moisture gradient. N and P dynamics within and among the sites were related to water table position, peat moisture content and temperature. Phosphorus supply rates and total inorganic N pools and supply rates were generally elevated under wetter conditions, whereas nitrate (NO 3 À ) pools and supply rates and P pools did not vary along a moisture gradient. In general, net immobilization was observed at the wetter sites where nutrient pools were elevated and net mineralization was observed at drier sites where nutrient pools were lower. Nutrient transformation rates were most strongly driven by warmer temperatures. Nutrient availability and immobilization rates were anomalously high at one peatland (a disturbed fen with a semi-permanent road and decommissioned well pads). We suggest that reclamation and management practices should focus on regulating peatland hydrologic conditions, optimizing these for the most desirable nutrient levels for vegetation growth.

show abstract

Denitrification rates in marsh fringes and fens in two boreal peatlands in Alberta, Canada

Cited by 33 publications

References 53 publications

Nitrogen mineralization and gaseous nitrogen losses from waterlogged and drained organic soils in a black alder (<i>Alnus glutinosa</i> (L.) Gaertn.) forest

Nitrogen mineralization and gaseous nitrogen losses from waterlogged and drained organic soils in a black alder (<i>Alnus glutinosa</i> (L.) Gaertn.) forest

Nitrogen dynamics in floating and non-floating peatlands in the Western Boreal Plain

Spatial variation in nutrient dynamics among five different peatland types in the Alberta oil sands region

Contact Info

Product

Resources

About

Denitrification rates in marsh fringes and fens in two boreal peatlands in Alberta, Canada

Cited by 33 publications

References 53 publications

Nitrogen mineralization and gaseous nitrogen losses from waterlogged and drained organic soils in a black alder (&lt;i&gt;Alnus glutinosa&lt;/i&gt; (L.) Gaertn.) forest

Nitrogen mineralization and gaseous nitrogen losses from waterlogged and drained organic soils in a black alder (&lt;i&gt;Alnus glutinosa&lt;/i&gt; (L.) Gaertn.) forest

Nitrogen dynamics in floating and non-floating peatlands in the Western Boreal Plain

Spatial variation in nutrient dynamics among five different peatland types in the Alberta oil sands region

Contact Info

Product

Resources

About

Nitrogen mineralization and gaseous nitrogen losses from waterlogged and drained organic soils in a black alder (<i>Alnus glutinosa</i> (L.) Gaertn.) forest

Nitrogen mineralization and gaseous nitrogen losses from waterlogged and drained organic soils in a black alder (<i>Alnus glutinosa</i> (L.) Gaertn.) forest