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Enhanced nitrogen deposition exacerbates the negative effect of increasing background ozone in Dactylis glomerata, but not Ranunculus acris

Wyness, Kirsten; Mills, Gina; Jones, Laurence; Barnes, Jeremy D.; Jones, Davey L.. 2011 Enhanced nitrogen deposition exacerbates the negative effect of increasing background ozone in Dactylis glomerata, but not Ranunculus acris. Environmental Pollution, 159 (10). 2493-2499. 10.1016/j.envpol.2011.06.022

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Abstract/Summary

The combined impacts of simulated increased nitrogen (N) deposition (75 kg N ha−1 yr−1) and increasing background ozone (O3) were studied using two mesotrophic grassland species (Dactylis glomerata and Ranunculus acris) in solardomes, by means of eight O3 treatments ranging from 15.5 ppb to 92.7 ppb (24 h average mean). A–Ci curves were constructed for each species to gauge effects on photosynthetic efficiency and capacity, and effects on biomass partitioning were determined after 14 weeks. Increasing the background concentration of O3 reduced the healthy above ground and root biomass of both species, and increased senesced biomass. N fertilisation increased biomass production in D. glomerata, and a significantly greater than additive effect of O3 and N on root biomass was evident. In contrast, R. acris biomass was not affected by high N. The study shows the combined effects of these pollutants have differential implications for carbon allocation patterns in common grassland species.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.envpol.2011.06.022
Programmes: CEH Topics & Objectives 2009 onwards > Biogeochemistry
CEH Sections: Emmett
ISSN: 0269-7491
Additional Keywords: ozone, nitrogen, root:shoot ratio, grassland, carbon allocation
NORA Subject Terms: Ecology and Environment
Atmospheric Sciences
Date made live: 26 Sep 2011 09:01
URI: http://nora.nerc.ac.uk/id/eprint/15167

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