Interaction of carbon dioxide and ozone on growth and physiology of C[sub 3] and C[sub 4] species

Conference · Tue Jun 01 04:00:00 EDT 1993 · Bulletin of the Ecological Society of America; (United States)

OSTI ID:6202097

Volin, J C; Reich, P B ^[1]

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1. Univ. of Wisconsin, Madison (United States) Univ. of Minnesota, St. Paul (United States)

Six native tree and grass species from the forests and prairies of the Midwestern US, differing in stomatal conductance and photosynthetic pathway, were exposed to both ambient and elevated levels of carbon dioxide (CO[sub 2]) and ozone (O[sub 3]). Treatments consisted of all combinations of 350 [mu]L L[sup [minus]1] and 650 [mu]L L[sup [minus]1] CO[sub 2], and < 10 nL L[sup [minus]1] and 100 nL L[sup [minus]1] O[sub 3]. At ambient CO[sub 2], elevated O[sub 3] decreased whole-plant growth in three of the six species after 100 days of exposure. However, this decrease was only significant (P < 0.05) for the C[sub 3] grass species, Agropyron smithii and the tree species Populus tremuloides. Growth losses also occurred for the C[sub 3] grass, Koeleria cristata (P = 0.07) in elevated O[sub 3]. For these three species the deleterious effects of elevated O[sub 3] on whole-plant growth were ameliorated by elevated CO[sub 2]. There were no significant treatment effects on whole-plant growth for the two C[sub 4] grasses, Bouteloua curtipendula, and Schizachyrium scoparium and the tree species Quercus rubra. Photosynthesis measured in high-light for Agrpyron smithii, Koeleria cristata, Populus tremuloides and Schizachyrium scoparium, was reduced significantly (P < 0.05) by elevated O[sub 3] at ambient but not elevated levels of CO[sub 2].

• OSTI ID: 6202097
• Report Number(s): CONF-930798--
• Conference Information: Journal Name: Bulletin of the Ecological Society of America; (United States) Journal Volume: 74:2
• Country of Publication: United States
• Language: English

Related Subjects

560300* -- Chemicals Metabolism &amp; Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BIOLOGICAL EFFECTS
C4 SPECIES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
ECOSYSTEMS
FORESTS
GRAMINEAE
GROWTH
LILIOPSIDA
MAGNOLIOPHYTA
MAGNOLIOPSIDA
OAKS
OXIDES
OXYGEN COMPOUNDS
OZONE
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANT GROWTH
PLANTS
POPLARS
RANGELANDS
SYNTHESIS
TERRESTRIAL ECOSYSTEMS
TREES