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Treatments were elevated ozone (AOT40 (Accumulated Ozone Threshold exposure of 40 parts per billion) of 12.86 ppm h) or control conditions (AOT40 of 0.02 ppm h). Measurements were dry weight, with a cutting height of 7cm above soil level. The distribution of plant material within the canopy was determined by separating material growing in the upper canopy (>14cm) from the canopy edge and the inner canopy for both species. The experiments were carried out in the CEH Bangor Air Pollution Facility. Work was funded by the Centre for Ecology & Hydrology Integrating Fund Initiative. The observed decreases in photosynthetic efficiency and capacity in elevated ozone indicate that the ability of such ubiquitous vegetation to act as a sink for atmospheric carbon may be reduced in future climates.","distributionFormats":[{"name":"Comma-separated values (CSV)","type":"text/csv","version":"unknown"}],"distributorContacts":[{"organisationName":"NERC EDS Environmental Information Data Centre","role":"distributor","email":"enquiries@ceh.ac.uk","address":{"deliveryPoint":"Environment Centre Wales, Deiniol Road ","city":"Bangor","administrativeArea":"Gwynedd","postalCode":"LL57 2UW","country":"United Kingdom"}}],"id":"5de90f7a-dec9-4bd5-af52-d0873a09d25d","incomingCitationCount":0,"infoLinks":[{"url":"https://data-package.ceh.ac.uk/sd/5de90f7a-dec9-4bd5-af52-d0873a09d25d.zip","name":"Supporting information","description":"Supporting information available to assist in re-use of this dataset.","function":"information","type":"OTHER"}],"inspireThemes":[{"theme":"Environmental Monitoring Facilities","uri":"http://inspire.ec.europa.eu/theme/ef"}],"keywordsOther":[{"value":"competition"},{"value":"solar domes"},{"value":"solardome"},{"value":"Trifolium repens","uri":"http://www.wikidata.org/entity/Q148675"},{"value":"Lolium perenne","uri":"http://www.wikidata.org/entity/Q161722"},{"value":"root","uri":"http://www.eionet.europa.eu/gemet/concept/7312"},{"value":"leaf","uri":"http://www.eionet.europa.eu/gemet/concept/4730"},{"value":"grassland","uri":"http://www.eionet.europa.eu/gemet/concept/3733"},{"value":"ozone","uri":"http://www.eionet.europa.eu/gemet/concept/5991"}],"keywordsPlace":[{"value":"Abergwyngregyn","uri":"http://sws.geonames.org/7300634"}],"keywordsTheme":[{"value":"Pollution","uri":"http://onto.nerc.ac.uk/CEHMD/topic/15"}],"licences":[{"value":"This resource is made available under the terms of the Open Government Licence ","code":"license","uri":"https://eidc.ac.uk/licences/ogl/plain"}],"lineage":"Trifolium repens and Lolium perenne were exposed as both monocultures and two-species mixtures to an episodic rural ozone regime in large, well-watered containers within solardomes for 12 weeks. Treatments were elevated ozone (AOT40 of 12.86 ppm h) or control conditions (AOT40 of 0.02 ppm h). There were reductions in biomass for T. repens, but not L. perenne, and the proportion of T. repens decreased in ozone-exposed mixtures compared to the control. In addition, leaf biomass of T. repens was maintained at the expense of biomass partitioning to the stolons. The decreased growth corresponded with decreased photosynthetic capacity for T. repens, however, by the end of the exposure there was also decreased photosynthetic capacity of L. perenne, a species previously considered insensitive to ozone. The observed decreases in photosynthetic efficiency and capacity in elevated ozone indicate that the ability of such ubiquitous vegetation to act as a sink for atmospheric carbon may be reduced in future climates.","metadataDate":"2026-06-29T18:23:06","notGEMINI":false,"onlineResources":[{"url":"https://data-package.ceh.ac.uk/data/5de90f7a-dec9-4bd5-af52-d0873a09d25d","name":"Download the data","description":"Download a copy of this data","function":"download","type":"OTHER"},{"url":"https://data-package.ceh.ac.uk/sd/5de90f7a-dec9-4bd5-af52-d0873a09d25d.zip","name":"Supporting information","description":"Supporting information available to assist in re-use of this dataset.","function":"information","type":"OTHER"}],"pointsOfContact":[{"organisationName":"UK Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"pointOfContact","email":"enquiries@ceh.ac.uk","address":{"deliveryPoint":"Environment Centre Wales, Deiniol Road ","city":"Bangor","administrativeArea":"Gwynedd","postalCode":"LL57 2UW","country":"United Kingdom"},"pointOfContact":"UK Centre for Ecology & Hydrology"}],"publicationDate":"2014-12-18T00:00:00.000Z","publishers":[{"organisationName":"NERC Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"publisher","email":"info@eidc.ac.uk"}],"relationships":[{"relation":"http://purl.org/dc/terms/isPartOf","target":"54d8a3f9-eafb-4aa3-ac6e-55b697d05fdd"}],"resourceIdentifiers":[{"code":"1418144487386","codeSpace":"CEH:EIDC:"},{"code":"https://catalogue.ceh.ac.uk/id/5de90f7a-dec9-4bd5-af52-d0873a09d25d"},{"code":"10.5285/5de90f7a-dec9-4bd5-af52-d0873a09d25d","codeSpace":"doi"}],"resourceMaintenance":[{"frequencyOfUpdate":"notPlanned"}],"resourceType":{"value":"dataset"},"responsibleParties":[{"organisationName":"UK Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"pointOfContact","email":"enquiries@ceh.ac.uk","address":{"deliveryPoint":"Environment Centre Wales, Deiniol Road ","city":"Bangor","administrativeArea":"Gwynedd","postalCode":"LL57 2UW","country":"United Kingdom"},"pointOfContact":"UK Centre for Ecology & Hydrology"},{"familyName":"Hayes","givenName":"F.","organisationName":"Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"author","email":"enquiries@ceh.ac.uk","nameIdentifier":"https://orcid.org/0000-0002-1037-5725","address":{"deliveryPoint":"Environment Centre Wales, Deiniol Road ","city":"Bangor","administrativeArea":"Gwynedd","postalCode":"LL57 2UW","country":"United Kingdom"},"fullName":"Hayes, F."},{"familyName":"Mills","givenName":"G.","organisationName":"Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"author","email":"enquiries@ceh.ac.uk","nameIdentifier":"https://orcid.org/0000-0001-9870-2868","address":{"deliveryPoint":"Environment Centre Wales","administrativeArea":"Gwynedd","country":"United Kingdom"},"fullName":"Mills, G."},{"familyName":"Ashmore","givenName":"M.","organisationName":"University of York","organisationIdentifier":"https://ror.org/04m01e293","role":"author","email":"mike.ashmore@york.ac.uk","address":{"administrativeArea":"Yorkshire","country":"United Kingdom"},"fullName":"Ashmore, M."},{"organisationName":"NERC EDS Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"custodian","email":"info@eidc.ac.uk"},{"organisationName":"NERC Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"publisher","email":"info@eidc.ac.uk"},{"organisationName":"UK Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"rightsHolder","email":"enquiries@ceh.ac.uk"}],"rightsHolders":[{"organisationName":"UK Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"rightsHolder","email":"enquiries@ceh.ac.uk"}],"spatialReferenceSystems":[{"code":"http://www.opengis.net/def/crs/EPSG/0/4326","title":"WGS 84"}],"spatialRepresentationTypes":["textTable"],"supplemental":[{"description":"Hayes, Felicity; Mills, Gina; Ashmore, Mike. 2010 How much does the presence of a competitor modify the within-canopy distribution of ozone-induced senescence and visible injury? 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