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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.
|Keywords: ||Carnivorous plants|
Global environmental change
|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|
|Publisher Link: ||http://dx.doi.org/10.1007/s12224-011-9114-9|
|Appears in Collections:||Published Articles (Geography and Environment)|
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