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Growth and morphology of Pinus ponderosa seedlings exposed to long-term elevated atmospheric carbon dioxide concentrations. [Pinus ponderosa]

Conference ·
OSTI ID:5385189
; ; ;
The growth and morphology of two varieties of Pinus ponderosa were measured after two years of continuous fumigation with carbon dioxide. After two years of treatment, the seedlings of the Rocky Mountain variety showed no significant difference in total stem height or volume, but the basal diameters of those grown at +300 ppM CO/sub 2/ were significantly greater than those grown at +0 ppM and +75 ppM. The response of the seedlings of the Sierran variety in these parameters was quite different, with those at +150 ppM and +300 ppM significantly greater in height than those at +75 ppM, and those at +150 ppM and +300 ppM significantly greater than those at +0 ppM and +75 ppM in basal diameter and stem volume. However, using a combined analysis based on percent change in height, diameter, or volume, seedlings at +150 ppM responded to a significantly greater degree than all other levels. Thus, the beneficial effects of elevated carbon dioxide increase up to +150 ppM and begin to decrease between +150 ppM and +300 ppM.
Research Organization:
California Univ., Berkeley (USA). Dept. of Forestry and Resource Management; Lawrence Livermore National Lab., CA (USA). Environmental Sciences Div.
DOE Contract Number:
W-7405-ENG-48
OSTI ID:
5385189
Report Number(s):
UCRL-95054; CONF-8606147-3; ON: DE86014452
Country of Publication:
United States
Language:
English

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Related Subjects

560303* -- Chemicals Metabolism & Toxicology-- Plants-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BIOLOGICAL EFFECTS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CONIFERS
DATA
DOSE-RESPONSE RELATIONSHIPS
EXPERIMENTAL DATA
GROWTH
INFORMATION
MORPHOLOGICAL CHANGES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PINES
PLANT GROWTH
PLANTS
TREES