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rft.atitle Contrasting Responses of Nitrogen-Fixation in Arctic Lichens to Experimental and Ambient Nitrogen and Phosphorus Availability
rft.epage 401
rft.genre article
rft.issn 1523-0430
1938-4246
rft.issue 3
rft.jtitle Arctic, Antarctic, and Alpine Research
rft.tpages 5
rft.pages 396-401
rft.pub Institute of Arctic and Alpine Research
rft.date 2005-08-01
x.date 2005-08-01T00:00:00Z
rft.spage 396
rft.volume 37
abstract <p>We investigated the influence of nitrogen (N) and phosphorus (P) on<tex-math>$N_{2}-fixation$</tex-math>and abundance of two of the most common<tex-math>$N_{2}-fixing$</tex-math>arctic lichens, Peltigera aphthosa and P. polydactyla, in two common moist upland tundra types, acidic and non-acidic tundra, at Toolik Lake, Alaska. Acidic tundra has higher N and lower P availability than non-acidic tundra. We measured the abundance of the lichens in control (no fertilization), N- and P- fertilized plots, and<tex-math>$N_{2}-fixation$</tex-math>using the acetylene reduction assay method on lichens from control and P-fertilized plots from both tundra types. Lichens on N-treated plots were too scarce to include in our<tex-math>$N_{2}-fixation$</tex-math>estimates. Lichen abundance was lower in plots fertilized with N than in control and P-fertilized plots, while per-biomass<tex-math>$N_{2}-fixation$</tex-math>rates were higher in P-fertilized plots than in control plots. Per-biomass rates of<tex-math>$N_{2}-fixation$</tex-math>did not differ between acidic and non-acidic tundra, but both lichen species are more abundant on acidic tundra. Thus, despite per-biomass stimulation of<tex-math>$N_{2}-fixation$</tex-math>by experimental P addition and reduction in lichen abundance with N fertilization, Peltigera contributes more N to the acidic tundra site, indicating that soil N and P availability are not the primary controls of<tex-math>$N_{2}-fixation$</tex-math>and abundance of these lichens.</p>
authors Array ( )
Array ( [rft.aulast] => Hobbie [rft.aufirst] => Sarah E. )
Array ( [rft.aulast] => Gettel [rft.aufirst] => Gretchen M. )
languages eng
url https://www.jstor.org/stable/4095902
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author Hobbie, Sarah E., Gettel, Gretchen M.
author_facet Hobbie, Sarah E., Gettel, Gretchen M., Hobbie, Sarah E., Gettel, Gretchen M.
author_sort hobbie, sarah e.
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container_issue 3
container_start_page 396
container_title Arctic, Antarctic, and Alpine Research
container_volume 37
description <p>We investigated the influence of nitrogen (N) and phosphorus (P) on<tex-math>$N_{2}-fixation$</tex-math>and abundance of two of the most common<tex-math>$N_{2}-fixing$</tex-math>arctic lichens, Peltigera aphthosa and P. polydactyla, in two common moist upland tundra types, acidic and non-acidic tundra, at Toolik Lake, Alaska. Acidic tundra has higher N and lower P availability than non-acidic tundra. We measured the abundance of the lichens in control (no fertilization), N- and P- fertilized plots, and<tex-math>$N_{2}-fixation$</tex-math>using the acetylene reduction assay method on lichens from control and P-fertilized plots from both tundra types. Lichens on N-treated plots were too scarce to include in our<tex-math>$N_{2}-fixation$</tex-math>estimates. Lichen abundance was lower in plots fertilized with N than in control and P-fertilized plots, while per-biomass<tex-math>$N_{2}-fixation$</tex-math>rates were higher in P-fertilized plots than in control plots. Per-biomass rates of<tex-math>$N_{2}-fixation$</tex-math>did not differ between acidic and non-acidic tundra, but both lichen species are more abundant on acidic tundra. Thus, despite per-biomass stimulation of<tex-math>$N_{2}-fixation$</tex-math>by experimental P addition and reduction in lichen abundance with N fertilization, Peltigera contributes more N to the acidic tundra site, indicating that soil N and P availability are not the primary controls of<tex-math>$N_{2}-fixation$</tex-math>and abundance of these lichens.</p>
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imprint Institute of Arctic and Alpine Research, 2005
imprint_str_mv Institute of Arctic and Alpine Research, 2005
institution DE-15, DE-14, DE-D13
issn 1523-0430, 1938-4246
issn_str_mv 1523-0430, 1938-4246
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spelling Hobbie, Sarah E. Gettel, Gretchen M. 1523-0430 1938-4246 Institute of Arctic and Alpine Research https://www.jstor.org/stable/4095902 <p>We investigated the influence of nitrogen (N) and phosphorus (P) on<tex-math>$N_{2}-fixation$</tex-math>and abundance of two of the most common<tex-math>$N_{2}-fixing$</tex-math>arctic lichens, Peltigera aphthosa and P. polydactyla, in two common moist upland tundra types, acidic and non-acidic tundra, at Toolik Lake, Alaska. Acidic tundra has higher N and lower P availability than non-acidic tundra. We measured the abundance of the lichens in control (no fertilization), N- and P- fertilized plots, and<tex-math>$N_{2}-fixation$</tex-math>using the acetylene reduction assay method on lichens from control and P-fertilized plots from both tundra types. Lichens on N-treated plots were too scarce to include in our<tex-math>$N_{2}-fixation$</tex-math>estimates. Lichen abundance was lower in plots fertilized with N than in control and P-fertilized plots, while per-biomass<tex-math>$N_{2}-fixation$</tex-math>rates were higher in P-fertilized plots than in control plots. Per-biomass rates of<tex-math>$N_{2}-fixation$</tex-math>did not differ between acidic and non-acidic tundra, but both lichen species are more abundant on acidic tundra. Thus, despite per-biomass stimulation of<tex-math>$N_{2}-fixation$</tex-math>by experimental P addition and reduction in lichen abundance with N fertilization, Peltigera contributes more N to the acidic tundra site, indicating that soil N and P availability are not the primary controls of<tex-math>$N_{2}-fixation$</tex-math>and abundance of these lichens.</p> Contrasting Responses of Nitrogen-Fixation in Arctic Lichens to Experimental and Ambient Nitrogen and Phosphorus Availability Arctic, Antarctic, and Alpine Research
spellingShingle Hobbie, Sarah E., Gettel, Gretchen M., Arctic, Antarctic, and Alpine Research, Contrasting Responses of Nitrogen-Fixation in Arctic Lichens to Experimental and Ambient Nitrogen and Phosphorus Availability
title Contrasting Responses of Nitrogen-Fixation in Arctic Lichens to Experimental and Ambient Nitrogen and Phosphorus Availability
title_full Contrasting Responses of Nitrogen-Fixation in Arctic Lichens to Experimental and Ambient Nitrogen and Phosphorus Availability
title_fullStr Contrasting Responses of Nitrogen-Fixation in Arctic Lichens to Experimental and Ambient Nitrogen and Phosphorus Availability
title_full_unstemmed Contrasting Responses of Nitrogen-Fixation in Arctic Lichens to Experimental and Ambient Nitrogen and Phosphorus Availability
title_short Contrasting Responses of Nitrogen-Fixation in Arctic Lichens to Experimental and Ambient Nitrogen and Phosphorus Availability
title_sort contrasting responses of nitrogen-fixation in arctic lichens to experimental and ambient nitrogen and phosphorus availability
title_unstemmed Contrasting Responses of Nitrogen-Fixation in Arctic Lichens to Experimental and Ambient Nitrogen and Phosphorus Availability
url https://www.jstor.org/stable/4095902