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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). ACi curves were carried out mid-way and at the end of the exposure period using a Portable Photosynthesis System, CIRAS (PP-Systems) to calculate the photosynthetic parameters Jmax (maximum rate of photosynthetic electron transport) and Vcmax (maximum rate of Rubisco carboxylase activity). 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. The experiment was carried out at the CEH Bangor Air Pollution Facility. This work was funded by the Centre for Ecology & Hydrology Integrating Fund Initiative.","distributionFormats":[{"name":"Comma-separated values (CSV)","type":"text/csv","version":"unknown"}],"distributorContacts":[{"organisationName":"NERC EDS Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"distributor","email":"info@eidc.ac.uk"}],"id":"f14b9056-ccc0-4887-812e-c004f613a138","incomingCitationCount":0,"infoLinks":[{"url":"https://data-package.ceh.ac.uk/sd/f14b9056-ccc0-4887-812e-c004f613a138.zip","name":"Supporting information","description":"Supporting information available to assist in re-use of this dataset.","function":"information","type":"OTHER"}],"inspireThemes":[{"theme":"Atmospheric Conditions","uri":"http://inspire.ec.europa.eu/theme/ac"}],"keywordsOther":[{"value":"Trifolium repens","uri":"http://www.wikidata.org/entity/Q148675"},{"value":"Lolium perenne","uri":"http://www.wikidata.org/entity/Q161722"}],"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). After 6 weeks there was 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. ACi curves were carried out mid-way and at the end of the exposure period using a Portable Photosynthesis System, CIRAS (PP-Systems).","metadataDate":"2026-06-29T16:55:26","notGEMINI":false,"onlineResources":[{"url":"https://data-package.ceh.ac.uk/data/f14b9056-ccc0-4887-812e-c004f613a138","name":"Download the data","description":"Get a copy of this data","function":"download","type":"OTHER"},{"url":"https://data-package.ceh.ac.uk/sd/f14b9056-ccc0-4887-812e-c004f613a138.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","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":"1418144571060","codeSpace":"CEH:EIDC:"},{"code":"https://catalogue.ceh.ac.uk/id/f14b9056-ccc0-4887-812e-c004f613a138"},{"code":"10.5285/f14b9056-ccc0-4887-812e-c004f613a138","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","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":{"administrativeArea":"Gwynedd","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":{"administrativeArea":"Gwynedd","country":"United Kingdom"},"fullName":"Mills, G."},{"familyName":"Ashmore","givenName":"M.","organisationName":"University of York","organisationIdentifier":"https://ror.org/04m01e293","role":"author","email":"mikeashmore@york.ac.uk","address":{"administrativeArea":"York","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? Water, Air and Soil Pollution, 210. 265-276. ","url":"https://doi.org/10.1007/s11270-009-0248-9","function":"relatedArticle"},{"description":"Hayes,F.; Mills, G.; Ashmore, M.. 2009 Effects of ozone on inter- and intra-species competition and photosynthesis in mesocosms of Lolium perenne and Trifolium repens. Environmental Pollution, 157 (1). 208-214.","url":"https://doi.org/10.1016/j.envpol.2008.07.002","function":"relatedArticle"}],"temporalExtents":[{"begin":"2007-04-30","end":"2007-10-31"}],"title":"Photosynthesis of Trifolium repens versus Lolium perenne after ozone exposure in solardomes","topicCategories":[{"value":"biota","uri":"http://inspire.ec.europa.eu/metadata-codelist/TopicCategory/biota"}],"topics":["http://onto.nerc.ac.uk/CEHMD/topic/15"],"type":"dataset","uri":"https://catalogue.ceh.ac.uk/id/f14b9056-ccc0-4887-812e-c004f613a138","useConstraints":[{"value":"This resource is made available under the terms of the Open Government Licence ","code":"license","uri":"https://eidc.ac.uk/licences/ogl/plain"},{"value":"© UK Centre for Ecology & Hydrology","code":"copyright"}]}