Nitrogen mediates above-ground effects of ozone but not below-ground effects in a rhizomatous sedge

Jones, M.L.M.; Hodges, G.; Mills, G.. 2010 Nitrogen mediates above-ground effects of ozone but not below-ground effects in a rhizomatous sedge. Environmental Pollution, 158 (2). 559-565. 10.1016/j.envpol.2009.08.002

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Ozone and atmospheric nitrogen are co-occurring pollutants with adverse effects on natural grassland vegetation. Plants of the rhizomatous sedge Carex arenaria were exposed to four ozone regimes representing increasing background concentrations (background-peak): 10–30, 35–55, 60–80 and 85–105 ppb ozone at two nitrogen levels: 12 and 100 kg N ha−1 yr−1. Ozone increased the number and proportion of senesced leaves, but not overall leaf number. There was a clear nitrogen × ozone interaction with high nitrogen reducing proportional senescence in each treatment and increasing the ozone dose (AOT40) at which enhanced senescence occurred. Ozone reduced total biomass due to significant effects on root biomass. There were no interactive effects on shoot:root ratio. Rhizome tissue N content was increased by both nitrogen and ozone. Results suggest that nitrogen mediates above-ground impacts of ozone but not impacts on below-ground resource translocation. This may lead to complex interactive effects between the two pollutants on natural vegetation.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.envpol.2009.08.002
Programmes: CEH Topics & Objectives 2009 - 2012 > Biogeochemistry > BGC Topic 1 - Monitoring and Interpretation of Biogeochemical and Climate Changes > BGC - 1.3 - Quantify & attribute changes in biogeochemiical cycles ...
CEH Sections: Emmett
ISSN: 0269-7491
Additional Keywords: Carex arenaria, Plant growth, Root:shoot ratio, Sand dunes, Grassland
NORA Subject Terms: Agriculture and Soil Science
Ecology and Environment
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Date made live: 23 Apr 2010 14:45

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