The fate of NH4NO3 added toSphagnum magettanicum carpets at five European mire sites

Williams, B. L.; Buttler, Alexandre; Grosvernier, Philippe; Francez, André-Jean; Gilbert, Daniel; Ilomets, Mati; Jauhiainen, Jyrki; Matthey, Y.; Silcock, D. J.; Vasander, Harri

doi:10.1007/bf00992874

Cited by 29 publications

(31 citation statements)

References 16 publications

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“…Aerts et al (1992) concluded, based on the studies on the two Swedish sites discussed above, that high atmospheric nitrogen supply may affect the carbon balance of ombrotrophic bogs, because productivity under these circumstances is phosphorus, rather than nitrogen limited, but decomposition is probably increased by the high nitrogen loads. This hypothesis is supported by the results of the short-term experiments of Williams et al (1999a) and Williams and Silcock (2000) (for details, see above). The addition of 30 kg N ha -1 yr -1 resulted in a decrease in peat C:N ratios (Williams et al, 1999a), which could enhance rates of first-stage organic matter decomposition and nitrogen mineralization (Aerts et al, 1992).…”

Section: D) Effects On Peat and Peat Water Chemistry As Evidence Of Nsupporting

confidence: 78%

“…This hypothesis is supported by the results of the short-term experiments of Williams et al (1999a) and Williams and Silcock (2000) (for details, see above). The addition of 30 kg N ha -1 yr -1 resulted in a decrease in peat C:N ratios (Williams et al, 1999a), which could enhance rates of first-stage organic matter decomposition and nitrogen mineralization (Aerts et al, 1992). Furthermore, additions of nitrogen to cores of S. capillifolium and S. recurvum, although captured mainly by the moss, had significant effects on the C and N values of the microbial biomass in the underlying peat (Williams and Silcock, 2000).…”

Section: D) Effects On Peat and Peat Water Chemistry As Evidence Of Nsupporting

confidence: 78%

“…These experiments were only of four months duration, and hence of little value in terms of assessing critical loads, but showed clear contrasts in response between the sites, in terms of growth, increases in nitrogen content of the mosses, and in ammonium concentrations in the peat at 30 cm depth. The results suggest that both phosphorus limitation and a deep water table may decrease the retention of deposited inorganic nitrogen, and Williams et al (1999a) suggest that peat drainage may reduce retention of deposited nitrogen by Sphagnum carpets.…”

Section: D) Effects On Peat and Peat Water Chemistry As Evidence Of Nmentioning

confidence: 83%

“…However, the difficulties of generalising these experimental findings is indicated by Williams et al (1999a), who reported the effects of adding a range of nitrogen loads to Sphagnum magellanicum carpets at four contrasting sites, in Finland, Estonia and France, in addition to the Moidach More site in the UK. These experiments were only of four months duration, and hence of little value in terms of assessing critical loads, but showed clear contrasts in response between the sites, in terms of growth, increases in nitrogen content of the mosses, and in ammonium concentrations in the peat at 30 cm depth.…”

Section: D) Effects On Peat and Peat Water Chemistry As Evidence Of Nmentioning

confidence: 99%

See 3 more Smart Citations

Potential Approaches to Developing Lichen-Based Critical Loads and Levels for Nitrogen, Sulfur and Metal-Containing Atmospheric Pollutants in North America

Glavich¹,

Geiser²

2008

The Bryologist

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Section: D) Effects On Peat and Peat Water Chemistry As Evidence Of Nsupporting

confidence: 78%

Section: D) Effects On Peat and Peat Water Chemistry As Evidence Of Nsupporting

confidence: 78%

Section: D) Effects On Peat and Peat Water Chemistry As Evidence Of Nmentioning

confidence: 83%

Section: D) Effects On Peat and Peat Water Chemistry As Evidence Of Nmentioning

confidence: 99%

See 2 more Smart Citations

Potential Approaches to Developing Lichen-Based Critical Loads and Levels for Nitrogen, Sulfur and Metal-Containing Atmospheric Pollutants in North America

Glavich¹,

Geiser²

2008

The Bryologist

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“…Indeed, increasing N availability can be expected to enhance short-term Sphagnum litter decomposition through an increase of N content [Williams et al, 1999;Bragazza et al, 2006;Gerdol et al, 2007] and a decrease of (soluble) phenolics [Bragazza and Freeman, 2007], thereafter reducing the phenolics/N and the C/nutrient quotients. On the other hand, Sphagnum litter decomposition is strongly affected by its water content, and Sphagnum litter (solid circles) based on studies in which mass loss was monitored for more than 1 year.…”

Section: Litter Chemistrymentioning

confidence: 99%

Plant Litter Decomposition and Nutrient Release in Peatlands

Bragazza

Buttler

Siegenthaler

et al. 2013

Carbon Cycling in Northern Peatlands

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Experimental nitrogen addition alters structure and function of a boreal bog: critical load and thresholds revealed

Wieder

Vitt

Vile

et al. 2019

Ecological Monographs

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Bogs and fens cover 6% and 21%, respectively, of the 140,329 km2 Oil Sands Administrative Area in northern Alberta. Development of the oil sands has led to increasing atmospheric N deposition, with values as high as 17 kg N·ha−1·yr−1; regional background deposition is <2 kg N·ha−1·yr−1. Bogs, being ombrotrophic, may be especially susceptible to increasing N deposition. To examine responses to N deposition, over five years, we experimentally applied N (as NH4NO3) to a bog near Mariana Lake, Alberta, unaffected by oil sands activities, at rates of 0, 5, 10, 15, 20, and 25 kg N·ha−1·yr−1, plus controls (no water or N addition). Increasing N addition: (1) stimulated N2 fixation at deposition <3.1 kg N·ha−1·yr−1, and progressively inhibited N2 fixation as N deposition increased above this level; (2) had no effect on Sphagnum fuscum net primary production (NPP) in years 1, 2, and 4, but inhibited S. fuscum NPP in years 3 and 5; (3) stimulated dominant shrub and Picea mariana NPP; (4) led to increased root biomass and production; (5) changed Sphagnum species relative abundance (decrease in S. fuscum, increase in S. magellanicum, no effect on S. angustifolium); (6) led to increasing abundance of Rhododendron groenlandicum and Andromeda polifolia, and to vascular plants in general; (7) led to increasing shrub leaf N concentrations in Andromeda polifolia, Chamaedaphne calyculata, Vaccinium oxycoccos, V. vitis‐idaea, and Picea mariana; (8) stimulated cellulose decomposition, with no effect on S. fuscum peat or mixed vascular plant litter decomposition; (9) had no effect on net N mineralization rates or on porewater NH4+‐N, NO3−‐N, or DON concentrations; and (10) had minimal effects on peat microbial community composition. Increasing experimental N addition led to a switch from new N being taken up primarily by Sphagnum to being taken up primarily by shrubs. As shrub growth and cover increase, Sphagnum abundance and NPP decrease. Because inhibition of N2 fixation by increasing N deposition plays a key role in bog structural and functional responses, we recommend a N deposition critical load of 3 kg N·ha−1·yr−1 for northern Alberta bogs.

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The fate of NH4NO3 added toSphagnum magettanicum carpets at five European mire sites

Cited by 29 publications

References 16 publications

Potential Approaches to Developing Lichen-Based Critical Loads and Levels for Nitrogen, Sulfur and Metal-Containing Atmospheric Pollutants in North America

Potential Approaches to Developing Lichen-Based Critical Loads and Levels for Nitrogen, Sulfur and Metal-Containing Atmospheric Pollutants in North America

Plant Litter Decomposition and Nutrient Release in Peatlands

Experimental nitrogen addition alters structure and function of a boreal bog: critical load and thresholds revealed

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