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Growth responses of young cuttings of Populus deltoides X Populus nigra to ozone in controlled environments

Growth responses of young cuttings of Populus deltoides X Populus nigra to ozone in controlled environments

Canadian Journal of Forest Research 23(5): 854-858

ISSN/ISBN: 0045-5067

Controlled-environment facilities were used to determine the growth response of hybrid poplar using concentrations and exposure frequencies of ozone (O-3) that mimic ambient patterns. Young cuttings of Populus deltoides times nigra were exposed to daily bell-shaped concentration profiles of O-3 with four peak concentrations and two exposures per week for 1 to 4 weeks. Exposure to O-3 initially stimulated height growth rate, but repeated exposure resulted in decreases in height growth rate. Stem diameter growth rate decreased with increasing O-3 concentration. Leaf greenness decreased with repeated exposure. The rate of leaf production declined with increasing O-3 concentration. Many leaves abscised in the higher O-3 treatments, resulting ultimately in stimulation of bud break. Leaf area, leaf dry weight, and root dry weight at harvest decreased with increasing total O-3 exposure regardless of number of exposures. Stem dry weight was greater after limited initial O-3 exposure but was less after repeated O-3 exposures. Repeated exposures to O-3 were uniformly detrimental to poplar growth parameters.

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Accession: 008749320

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Related references

Growth responses of young cuttings of Populus deltoides X nigra to ozone in controlled environments. Canadian journal of forest research = Revue canadienne de recherche forestiere 23(5): 854-858, 1993

Growth responses of young cuttings of Populus deltoides nigra to ozone in controlled environments. Canadian Journal of Forest Research 23(5): 854-858, 1993

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