title: Decreased rates of terpene emissions in Ornithopus compressus L. and Trifolium striatum L. by ozone exposure and nitrogen fertilization.
abstract: Increasing tropospheric ozone (O3) and nitrogen soil availability (N) are two of the main drivers of global change. They both may affect gas exchange, including plant emission of volatiles such as terpenes. We conducted an experiment using open-top chambers to analyze these possible effects on two leguminous species of Mediterranean pastures that are known to have different O3 sensitivity, Ornithopus compressus and Trifolium striatum. O3 exposure and N fertilization did not affect the photosynthetic rates of O. compressus and T. striatum, although O3 tended to induce an increase in the stomatal conductance of both species, especially T. striatum, the most sensitive species. O3 and N soil availability reduced the emission of terpenes in O. compressus and T. striatum. If these responses are confirmed as a general pattern, O3 could affect the competitiveness of these species.
authors.affiliation: CREAF, Cerdanyola del Vallès, 08193 Catalonia, Spain; CSIC, Global Ecology Unit CREAF-CEAB-UAB, Cerdanyola del Vallès, 08193 Catalonia, Spain. Electronic address: j.llusia@creaf.uab.cat.
authors.forename: Joan
authors.initials: J
authors.lastname: Llusia
authors.affiliation: CIEMAT, Ecotoxicology of Air Pollution, Av. Complutense 40, 28040 Madrid, Spain.
authors.forename: Victoria
authors.initials: V
authors.lastname: Bermejo-Bermejo
authors.affiliation: CIEMAT, Ecotoxicology of Air Pollution, Av. Complutense 40, 28040 Madrid, Spain.
authors.forename: Héctor
authors.initials: H
authors.lastname: Calvete-Sogo
authors.affiliation: CREAF, Cerdanyola del Vallès, 08193 Catalonia, Spain; CSIC, Global Ecology Unit CREAF-CEAB-UAB, Cerdanyola del Vallès, 08193 Catalonia, Spain.
authors.forename: Josep
authors.initials: J
authors.lastname: Peñuelas
mesh_terms: D004784:Environmental Monitoring; D007887:Fabaceae / Q000187:drug effects / Q000502:physiology*; D005308:Fertilizers / Q000706:statistics & numerical data; D009584:Nitrogen / Q000032:analysis / Q000378:metabolism; D010126:Ozone / Q000032:analysis / Q000633:toxicity*; D010788:Photosynthesis / Q000187:drug effects; D018515:Plant Leaves / Q000737:chemistry / Q000502:physiology; D012987:Soil; D013729:Terpenes / Q000032:analysis / Q000378:metabolism*; D029921:Trifolium / Q000187:drug effects / Q000502:physiology*
chemical_list: D005308:Fertilizers; D012987:Soil; D013729:Terpenes; D010126:Ozone; D009584:Nitrogen
keywords: Annual pastures; BVOCS; Emissions; Gas exchange; Legumes; Nitrogen deposition; Ozone; Terpenes