Inertia in an ombrotrophic bog ecosystem in response to 9 years' realistic perturbation by wet deposition of nitrogen, separated by form

Sheppard, Lucy J.; Leith, Ian D.; Mizunuma, Toshie; Leeson, Sarah R.; Kivimäki, Sanna; Cape, J. N.; Dijk, Netty van; Leaver, David; Sutton, Mark A.; Fowler, D.; Berg, Leon J.L. van den; Crossley, A.; Field, Chris D.; Smart, Simon M.

doi:10.1111/gcb.12357

Cited by 33 publications

(33 citation statements)

References 75 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…120 applications yr -1 (Sheppard et al, 2014 behavior has been shown for both Na + (Eppinga et al, 2008;Staelens et al, 2008) and 219 Cl - (Appelo & Postma, 1994;Bragazza et al, 2005).…”

Section: Science Of the Total Environment Chiwa Et Al Revised Msmentioning

confidence: 94%

“…by Sheppard et al (2014). Their work demonstrated the long-term (9 years) 278 consequence of N addition on the cover of key components including Sphagnum,279 showing that N addition could significantly reduce the cover rate of Sphagnum, but that Elevated tissue N concentration in Sphagnum for Nred 56 (Fig.…”

mentioning

confidence: 96%

“…(NH4 + ) versus oxidized (NO3 -) N on the N status of the Sphagnum moss and the (Manninen et al, 2011;Sheppard et al, 2014), possibly due to the greater toxicity of 97 NH4 + (Gerendás et al, 1997;Krupa, 2003;Stevens et al, 2011;Limpens and Berendse, 98 2003) coupled to preferential uptake of NH4 + by Sphagnum (Fritz et al, 2014;Liu et al, 99 2013; Wiedermann et al, 2009). For example, Manninen et al (2011) found that NH4 + 100 addition increased shoot N concentration of Sphagnum and decreased photosynthetic 101 variables (Fv/Fm) and shoot dry weight of Sphagnum.…”

mentioning

confidence: 99%

“…Pore water that has passed through the Sphagnum filter may differ in terms of 103 water quality including pH (Manninen et al, 2011;Sheppard et al, 2014) (Krupa, 2003;Staelens et al, 2008;Stevens et al, 2011) and hydrogen 108 ion (H + ) leaching (Krupa, 2003;Liu et al, 2013;Manninen et al, 2011;Paulissen et al, 109 2004; Stevens et al, 2011;Tomassen et al, 2003). In contrast, NO3 -uptake is 110 accompanied by hydroxyl ion (OH -) loss generated by nitrate reduction (Manninen et al,111 2011; Stevens et al, 2011).…”

mentioning

confidence: 99%

“…However, few manipulation studies have evaluated the form 112 of reactive N in wet deposition (Blodau et al, 2006;Paulissen et al, 2004;Sheppard et Science of the Total Environment Chiwa et al Revised MS al., 2014;Sheppard et al, 2013;Van den Berg et al, 2008 habitats through the northern hemisphere (Gore, 1983 of ca. 8 kg N ha -1 yr -1 and supplied 10 % additional rainwater (Sheppard et al, 2014). A 164 rainwater only control per each of the four replicated blocks was also provided.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Sphagnum can ‘filter’ N deposition, but effects on the plant and pore water depend on the N form

Chiwa

Sheppard

Leith

et al. 2016

Science of The Total Environment

Self Cite

View full text Add to dashboard Cite

show abstract

“…120 applications yr -1 (Sheppard et al, 2014 behavior has been shown for both Na + (Eppinga et al, 2008;Staelens et al, 2008) and 219 Cl - (Appelo & Postma, 1994;Bragazza et al, 2005).…”

Section: Science Of the Total Environment Chiwa Et Al Revised Msmentioning

confidence: 94%

mentioning

confidence: 96%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Sphagnum can ‘filter’ N deposition, but effects on the plant and pore water depend on the N form

Chiwa

Sheppard

Leith

et al. 2016

Science of The Total Environment

Self Cite

View full text Add to dashboard Cite

show abstract

Response of canopy nitrogen uptake to a rapid decrease in bulk nitrate deposition in two eastern Canadian boreal forests

2014

View full text Add to dashboard Cite

A few studies have reported a recent and rapid decline in NO3(-) deposition in eastern North America. Whether this trend can be observed at remote boreal sites with low rates of N deposition and how it could impact canopy uptake (CU) of N remain unknown. Here we report trends between 1997/1999 and 2012 for precipitation, throughfall N deposition as well as inorganic N CU for two boreal forest sites of Quebec, Canada, with contrasted N deposition rates and tree species composition. NO3(-) bulk deposition declined by approximately 50% at both sites over the studied period while no change was observed for NH4(+). As a result, the contribution of NH4(+) to inorganic N deposition changed from ~33% to more than 50% during the study period. On average, 52-59% of N deposition was intercepted by the canopy, the retention being higher for NH4(+) (60-67%) than for NO3(-) (45-54%). The decrease in NO3(-) bulk deposition and the increase in the NH4(+):NO3(-) ratio had important impacts on N-canopy interactions. The contribution of NH4(+) CU to that of total inorganic N CU increased at both sites but the trend was significant only at Tirasse (lowest N deposition). At this site, absolute NO3(-) CU significantly decreased (as did total N CU) during the study period, a consequence of the strong relationship (r(2) = 0.88) between NO3(-) bulk deposition and NO3(-) CU. Our data suggest that N interactions with forest canopies may change rapidly with changes in N deposition as well as with tree species composition.

show abstract

Vegetation Composition in Bogs is Sensitive to Both Load and Concentration of Deposited Nitrogen: A Modeling Analysis

Blodau

2014

Ecosystems

View full text Add to dashboard Cite

Changes in vegetation composition due to nitrogen deposition may influence the role of peatlands in the carbon cycle. The impact of nitrogen (N) on vegetation composition of the Mer Bleue Bog (Ontario) and the underlying mechanisms were studied using a coupled carbon (C) and nitrogen wetland model (PEATBOG). The model was applied to data from a long-term nutrient fertilization experiment and the results were compared with the observed C and N pools in plants, peat, and soil water after 8 years of fertilization with 1.6, 3.2, and 6.4 gN m -2 y -1 and additional phosphorus and potassium. The evaluated model was employed to simulate the vegetation dynamics in the peatland fertilized with different loads and concentrations of N. The model suggested a shift in plant functional types from moss-shrub dominated to graminoid dominated with increasing N load. Suppression of mosses by N fertilization was mitigated by daily deposition of N at a low concentration. Mosses became extinct in the simulations only when the concentration and load of N deposition were high, corroborating empirical results from the fertilization experiment. Tracking the deposited N in the system, the model indicated that it was primarily sequestered in the peat. Dissolved N concentrations in peat and export from the bog increased with N load and decreased with N concentration, leading to higher N uptake by vascular plants. The results further suggested that the observed detrimental effect of N on mosses was most likely due to toxicity caused by N uptake exceeding N assimilation. Exposure of mosses to high N concentrations in precipitation and evaporating water on moss tissues is thus a factor that needs attention when considering critical loads of N deposition on peatlands.

show abstract

Inertia in an ombrotrophic bog ecosystem in response to 9 years' realistic perturbation by wet deposition of nitrogen, separated by form

Cited by 33 publications

References 75 publications

Sphagnum can ‘filter’ N deposition, but effects on the plant and pore water depend on the N form

Sphagnum can ‘filter’ N deposition, but effects on the plant and pore water depend on the N form

Response of canopy nitrogen uptake to a rapid decrease in bulk nitrate deposition in two eastern Canadian boreal forests

Vegetation Composition in Bogs is Sensitive to Both Load and Concentration of Deposited Nitrogen: A Modeling Analysis

Contact Info

Product

Resources

About