Predicted response of stem respiration in ponderosa pine to global climate change

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

OSTI ID:7272077

Carey, E V; DeLucia, E H; Callaway, R M ^[1]

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1. Univ. of Illinois, Urbana, IL (United States)

We measured woody tissue respiration on boles of desert and montane populations of Pinus ponderosa growing in the Great Basin Desert and on the east-slope of the Sierra Nevada as part of a study of responses of P. ponderosa to global climate change. The differences in temperature and precipitation between desert and montane populations match changes in climate predicted from a doubling of atmospheric CO[sub 2]; therefore, these naturally occurring populations represent the difference between present and future climatic conditions for these trees. Allometric relationships derived previously, indicate that for trees of equal diameter, desert trees predicted that desert trees would have lower Q[sub 10] responses for respiration (increase in respiration with a 10[degrees] increase in temperature) volume was not different between populations (Desert: 3.24; Montane: 3.13 moles m[sup [minus]3] sec[sup [minus]1]). Moreover, between population differences in Q[sub 10] for respiration were not statistically significant (Desert: 2.27; Montane: 2.39). Results suggest that under predicted future climatic conditions increased respiratory losses from woody tissue resulting from increased allocation to sapwood may offset increases in carbon uptake due to enhanced photosynthesis from elevated CO[sub 2].

• OSTI ID: 7272077
• 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

560400* -- Other Environmental Pollutant Effects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ARID LANDS
BIOCHEMISTRY
BIOLOGICAL EFFECTS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
CLIMATIC CHANGE
CONIFERS
DESERTS
ECOLOGICAL CONCENTRATION
GLOBAL ASPECTS
GREENHOUSE EFFECT
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PINES
PINOPHYTA
PLANT STEMS
PLANTS
SYNTHESIS
TREES