Modeling the physiological and growth responses of mature Pinus ponderosa Dougl. ex Laws. to climatic change

Journal Article · Thu Jun 01 04:00:00 EDT 1995 · Bulletin of the Ecological Society of America

OSTI ID:95769

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

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1. Univ. of Nevada, Reno, NV (United States)
2. Boyce Thompson Institute for Plant Research, Ithaca, NY (United States); and others

Using the TREGRO model we simulated the effects of altered CO{sub 2} (+200 {mu}L/L), temperature (+4{degrees}C) and O{sub 3} (0.5x, 1x and 2x ambient) on the physiology and growth of Pinus ponderosa. Photosynthesis (Pn) increased at elevated CO{sub 2} or temperature, enhancing total tree growth 29% and 13%, respectively. In both scenarios the greatest increase in dry matter was in fine root biomass. Ozone at all exposures reduced Pn, total tree growth was unaffected at 0.5x O{sub 3}, however, at higher O{sub 3} total growth was reduced 19% (1x) and 39% (2x). Reductions in fine root biomass and total non-structural carbohydrate dominated at all O{sub 3} exposures. Increased Pn at elevated CO{sub 2} or temperature reduced, but did not eliminate, O{sub 3}-induced growth reductions. In the model changes in Pn and stomatal conductance largely determined the growth response to multiple climatic alterations, however, changes in fine root biomass may control growth response in the field.

• OSTI ID: 95769
• Report Number(s): CONF-9507129--
• Journal Information: Bulletin of the Ecological Society of America, Journal Name: Bulletin of the Ecological Society of America Journal Issue: 2 Vol. 76; ISSN BECLAG; ISSN 0012-9623
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
55 BIOLOGY AND MEDICINE
BASIC STUDIES
56 BIOLOGY AND MEDICINE
APPLIED STUDIES
BIOLOGICAL EFFECTS
CARBON DIOXIDE
CLIMATIC CHANGE
ECOLOGICAL CONCENTRATION
OZONE
PHOTOSYNTHESIS
PHYSIOLOGY
PINES
PLANT GROWTH
ROOTS
TEMPERATURE DEPENDENCE