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

Lookup NU author(s): Dr Kirsten Wyness, Emeritus Professor Jerry Barnes

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Abstract

The combined impacts of simulated increased nitrogen (N) deposition (75 kg N ha(-1) yr(-1)) and increasing background ozone (03) were studied using two mesotrophic grassland species (Dactylis glomerata and Ranunculus acris) in solardomes, by means of eight O-3 treatments ranging from 15.5 ppb to 92.7 ppb (24 h average mean). A-C-i 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 O-3 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 O-3 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. (C) 2011 Elsevier Ltd. All rights reserved.

Publication metadata

Author(s): Wyness K, Mills G, Jones L, Barnes JD, Jones DL

Publication type: Article

Publication status: Published

Journal: Environmental Pollution

Year: 2011

Volume: 159

Issue: 10

Pages: 2493-2499

Print publication date: 08/07/2011

ISSN (print): 0269-7491

ISSN (electronic): 1873-6424

Publisher: Pergamon

URL: http://dx.doi.org/10.1016/j.envpol.2011.06.022

DOI: 10.1016/j.envpol.2011.06.022

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