Patterns of retention and utilization of aerially deposited nitrogen in boreal peatlands

Li, Yenhung; Vitt, Dale H.

doi:10.1080/11956860.1997.11682384

Cited by 86 publications

(77 citation statements)

References 32 publications

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“…(Granberg et al, 2001). Sphagnum species retain much of the N added (Malmer, 1988;Li & Vitt, 1997) and store much of the excess N as free amino acids, which have been found to accumulate with the addition of N (Baxter et al, 1992;Nordin & Gunnarsson, 2000). The Sphagnum plants in the high N plots in our study site had 70 -80% more N stored in the top 5 cm than untreated plots after 2 yr of applications (Granberg et al, 2001), indicating N accumulation.…”

Section: Effects Of Raised Temperature and Increases In N And S Influmentioning

confidence: 81%

Growth, production and interspecific competition in Sphagnum: effects of temperature, nitrogen and sulphur treatments on a boreal mire

2004

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Summary• Growth and production of Sphagnum balticum and interspecific competition between S. balticum and either Sphagnum lindbergii or transplanted Sphagnum papillosum , were studied in a 4-yr field experiment in a poor fen.• Temperature and influxes of nitrogen (N) and sulphur (S) were manipulated in a factorial design. The mean daily air temperature was increased by 3.6 ° C with glasshouse enclosures. Nitrogen loads were increased 15-fold and S loads seven-fold compared with the natural loads up to influxes observed during the 1980s in southwestern Sweden.• Production of S. balticum decreased with increasing temperature and N-influx. The N treatment significantly reduced the incremental length of S. balticum , and this reduction was reinforced with time (24% in the first year to 51% in the final year). The area covered by S. lindbergii changed with time in all treatments and S. papillosum area increased significantly in the temperature-treated plots.• Growth, production and competitive patterns change if the environmental conditions change. Increased N deposition and raised temperature may transform mires currently dominated by Sphagnum into vascular-plant-dominated mires.

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Section: Effects Of Raised Temperature and Increases In N And S Influmentioning

confidence: 81%

Growth, production and interspecific competition in Sphagnum: effects of temperature, nitrogen and sulphur treatments on a boreal mire

2004

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“…Increased productivity in response to nutrient additions has been documented for northern freshwater wetlands (Chapin, 1980;Craft and Richardson, 1997). Li and Vitt (1997) reported that N additions increased production of two mosses (Sphagnum fuscum in a bog and Tomethypnum nitens in a rich fen) but not of two shrubs [common Labrador tea (Ledum groendlandicum) nor dwarf birch (Betula pumila) in the fen], suggesting multiple controls on productivity in these systems and the potential for differential responses. Numerous studies have evaluated the relationship between productivity and nutrients, particularly N, in grasslands.…”

Section: Carbon Cycling and Utilizationmentioning

confidence: 99%

Ecological issues related to N deposition to natural ecosystems: research needs

Adams

2003

Environment International

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“…Elemental Loading Rates Reference Community, Location of N and/or P Rochefort et al (1990) Loach (1968) Rochefort and Vitt (1988) Li and Vitt (1997) B artsch (1994) Simms (1987) Shaver ) Chapin III et al (1995 This study Verhoeven and Schmitz (1991) Lechowics andShaver (1982) Vasander ( 1981 ) Bayley et al (1985) Poor fen, Ontario Ericaceous shrubs, England Mosses, Alberta Bog and fens, Alberta Raised bog, Maine Ericaceous shrubs, North Carolina Tussock tundra, Alaska Tussock tundra, Alaska Fens and marshes, Alberta…”

Section: Species or Plantmentioning

confidence: 99%

Response of aboveground net primary plant production to nitrogen and phosphorus fertilization in peatlands in southern boreal Alberta, Canada

Thormann

Bayley

1997

Wetlands

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In order to determine whether nitrogen (N) or phosphorus (P) limits aboveground plant growth in peatlands in Alberta, we fertilized one bog, two fens, and two marshes with N and P at a ratio of 7:1 (Redfield ratio of these two elemental nutrients in aquatic plants) as well as with water without either fertilizer in 1994. The response of aboveground plant production to N or P was species-specific and varied among the sites. In the bog, Smilacina trifolia, a herb. showed significant increases in net primary production (NPP) after fertilization with N plus water and the addition of water, while Andromeda polifolia only showed significant increases in NPP after fertilization with N plus water. Ledum groenlandicum, an ericaceous shrub, showed significant decreases in NPP after additions of N plus water, P plus water, and water, while Oxycoccus quadripetalus, another ericaceous shrub, also showed significant decreases of NPP after additions of N plus water and water. Sphagnum fuscum (moss) NPP increased significantly after the additions of water and decreased significantly after the additions of N plus water and P plus water. In the fens and marshes, only Carex spp. in the lacustrine sedge fen showed a significant increase in NPP after the addition of N. Vascular NPP (shrubs and herbs combined) did not increase significantly in any of the five peatlands. Total NPP (moss, herb, and shrub strata combined) increased significantly only in the bog after the addition of water due to the dominance of the moss stratum in that site. In the bog, moss growth was limited by water, and herb and shrub growth responses to N and P fertilization were species-specific. Neither N nor P limited aboveground plant production in the fens and marshes.

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Patterns of retention and utilization of aerially deposited nitrogen in boreal peatlands

Cited by 86 publications

References 32 publications

Growth, production and interspecific competition in Sphagnum: effects of temperature, nitrogen and sulphur treatments on a boreal mire

Growth, production and interspecific competition in Sphagnum: effects of temperature, nitrogen and sulphur treatments on a boreal mire

Ecological issues related to N deposition to natural ecosystems: research needs

Response of aboveground net primary plant production to nitrogen and phosphorus fertilization in peatlands in southern boreal Alberta, Canada

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