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  • Point Frame Measurements of Poor Fen Moss and Vascular Frequencies Under Increasing N Deposition Over Five Years, 2011-2015
  • Wieder, R Kelman; Villanova University
    Vitt, Dale H; Southern Illinois University
    Vile, Melanie A; Villanova University
    Graham, Jeremy A; Southern Illinois University
    Hartsock, Jeremy A; Southern Illinois University
    Popma, Jacqueline M.A.; University of Michigan
    Fillingim, Hope; Villanova University
    House, Melissa; Southern Illinois University
    Quinn, James C; Villanova University
    Scott, Kimberli D; Villanova University
    Petix, Meaghan; Southern Illinois University
    McMillen, Kelly J; Villanova University
  • 2020-03-02
  • Wieder, R.K., D.H. Vitt, M.A. Vile, J.A. Graham, J.A. Hartsock, J.M. Popma, H. Fillingim, M. House, J.C. Quinn, K.D. Scott, M. Petix, and K.J. McMillen. 2020. Point Frame Measurements of Poor Fen Moss and Vascular Frequencies Under Increasing N Deposition Over Five Years, 2011-2015 ver 2. Environmental Data Initiative. https://doi.org/DOI_PLACE_HOLDER (Accessed 2024-03-29).
  • 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 levels <2 kg N ha-1 yr-1. To examine responses to N deposition, over five years, we experimentally applied N (as NH4NO3) to a poor fen near Mariana Lake, Alberta, at rates of 0, 5, 10, 15, 20, and 25 kg N ha-1 yr-1, plus controls (no water or N addition). Anchored point frames were established at each plot and measure at 30 points along the frame each year in July. We used absolute frequencies of Sphagna and vascular plants to examine species and community responses to N treatment. Increasing N input led to led to decreased abundance of S. fuscum and increased abundance of S. angustifolium, S. magellanicum, Andromeda polifolia, Vaccinium oxycoccos, and of vascular plants in general. For dominant shrubs and all vascular species combined, N addition had no effect in the first two years, but frequencies increased with increasing N addition in 2013-2015. Pairwise year comparisons indicated a gradual change in plant species composition as the experiment progressed. Of the 21 pairwise comparisons between nominal N treatments, 18 were significant, indicating a clear influence of N addition on plant community composition. These results suggest that bogs that have persisted under very low ambient N deposition may be especially sensitive to increasing N deposition, in terms of plant species’ relative abundances and plant community composition.

  • N: 55.897      S: 55.897      E: -112.094      W: -112.094
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  • DOI PLACE HOLDER
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