Modeling the response of mature Pinus ponderosa Laws. to tropospheric ozone: Effects of genotypic variability

Conference · Wed Jun 01 04:00:00 EDT 1994 · Bulletin of the Ecological Society of America; (United States)

OSTI ID:7272489

Constable, J V.H.; Taylor, Jr, G E ^[1]; Weinstein, D A; Laurence, J A ^[2]

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1. Desert Research Institute, Reno, NV (United States)
2. Boyce Thompson Institute, Ithaca, NY (United States)

Regionally distributed pollutants (e.g., tropospheric ozone and CO[sub 2]) can influence the growth of terrestrial plants. The mosaic of genotypes in natural populations makes it difficult to predict the ecological consequences of pollutants throughout a species' distribution. We simulated the response of Pinus ponderosa Laws to ambient, sub-ambient and above-ambient troposopheric O[sub 3] for 3 years using TREGRO, a physiologically based three growth model. Parameters controlling growth and carbon allocation were obtained from the literature and were varied to simulate intravarietal and intervarietal genotypes (western var. Ponderosa and eastern var. Scopulorum) of Ponderosa Pine. Parameter differences between the varieties include physiology, carbon allocation and phenoloy. Ozone altered 3 year biomass gain (+6% to 61%) and fine root to leaf mass ratio ([minus]8% to [minus]14%) in spite of a small effect on photosynthesis ([<=] 10%). Overall, O[sub 3] caused growth differences between varieties to be reduced. The reduction in growth differences between genotypes due to ozone has consequences for regional identification of populations sensitive to the effects of tropospheric ozone.

• OSTI ID: 7272489
• Report Number(s): CONF-940894--
• Conference Information: Journal Name: Bulletin of the Ecological Society of America; (United States) Journal Volume: 75:2
• 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
BIOLOGICAL VARIABILITY
CONIFERS
GENETIC VARIABILITY
GROWTH
MATHEMATICAL MODELS
OZONE
PINES
PINOPHYTA
PLANT GROWTH
PLANTS
TREES