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We conducted a greenhouse experiment to determine: (1) if diverse provenances of black spruce ( Picea mariana  (Mill.) B.S.P.) respond similarly in growth, phenology and physiology to an approximately 300 ppm increase in atmospheric CO 2  concentration, and (2) the influence of photoperiod on both provenance and provenance × CO 2  interaction effects. Seedlings from provenances that originated from the Yukon (63°34′ N, 135°55′ W), British Columbia (58°47′ N, 123°38′ W), Alberta (52°22′ N, 115°15′ W), Newfoundland (50°54′ N, 56°06′ W) and Ontario (48°59′ N, 80°38′ W and 45°10′ N, 77°10′ W) were subjected to growth analysis in greenhouse growth chambers supplied with 712 ± 93 (SD) ppm CO 2  (elevated) or 394 ± 59 ppm CO 2  (ambient). Seedlings from Provenances 7000 and 6901 were also subjected to an extended photoperiod treatment and periodically measured for shoot and root gas exchange.

tree physiology

Growth, shoot phenology and physiology of diverse seed sources of black spruce: I. Seedling responses to varied atmospheric CO 2  concentrations and photoperiods