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Title: Response of Sphagnum papillosum and Drosera rotundifolia to reduced and oxidized wet nitrogen deposition
Authors: Millett, Jonathan
Leith, Ian D.
Sheppard, Lucy J.
Newton, Jason
Keywords: Carnivorous plants
Global environmental change
Nitrogen cycling
Nitrogen deposition
Ombrotrophic bog
Stable isotopes
Issue Date: 2012
Publisher: Springer Netherlands (© Institute of Botany, Academy of Sciences of the Czech Republic)
Citation: MILLETT, J ... et al, 2012. Response of Response of Sphagnum papillosum and Drosera rotundifolia to reduced and oxidized wet nitrogen deposition. Folia Geobotanica, 47 (2), pp.179-191.
Abstract: We transplanted Sphagnum 'turfs' containing abundant Drosera rotundifolia into an existing nitrogen deposition experiment at Whim Moss near Edinburgh. These mesocosms received simulated N deposition as either NH or NO , to give total N deposition rates of approximately 8, 16 or 32, or 64 kg N ha year . Simulated N deposition was added in a realistic way (i. e., with rainfall throughout the year). The δ N of this added N was elevated relative to background N. We measured the tissue chemistry and δ N of Sphagnum papillosum and D. rotundifolia over two years after transplant. Our aim was to determine uptake of the deposited N and the impact on S. papillosum tissue chemistry and D. rotundifolia tissue chemistry and ecology. We found clear, significant impacts of N deposition on S. papillosum, with increased capitula N content and reduced C:N ratio. Increased δ N indicated uptake of deposited N. The response of D. rotundifolia was less clear with impacts only at the highest rate of N deposition. There was no evidence of differential uptake of reduced or oxidized wet N deposition by either S. papillosum or D. rotundifolia. Using the natural abundance stable isotope method we estimated the minimum contribution of prey N to the total N in D. rotundifolia to be 35%. The results suggest that differences in the uptake of reduced or oxidized wet N deposition might not be ecologically significant when wet N deposition is added realistically. They also support the suggestion that a model of N dynamics in Sphagnum-dominated ecosystems that includes the role of Sphagnum as a small-scale ecosystem engineer, is required to predict vascular plant responses to N deposition accurately.
Description: The final publication is available at link.springer.com.
Version: Accepted for publication
DOI: 10.1007/s12224-011-9114-9
URI: https://dspace.lboro.ac.uk/2134/13431
Publisher Link: http://dx.doi.org/10.1007/s12224-011-9114-9
ISSN: 1211-9520
Appears in Collections:Published Articles (Geography and Environment)

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