Monthly Variations in Photosynthetic Rate of Jack Pine Provenances in Relation to their Height

• Published in: Canadian Journal of Forest Research
• Main Author: Logan, K. T.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Canadian Science Publishing 1971
• Subjects: Ecology; Forestry; Global and Planetary Change; Northwest Territories
• Online Access: http://dx.doi.org/10.1139/x71-036; http://www.nrcresearchpress.com/doi/pdf/10.1139/x71-036

Rates of apparent photosynthesis of ten jack pine (Pinusbanksiana Lamb.) provenances, representing a region from Maine to the Northwest Territories, were measured at monthly intervals from July to November. The trees were 7 years old and 1.4–3.5 m tall.Correlation between rate of apparent photosynthesis and height depended on time of year at which photosynthetic measurements were made. Before September no correlation was found; after September the tallest provenances had the highest photosynthetic rates. A major exception was the sole maritime provenance studied: its high photosynthetic rate was not matched by good total height growth at Petawawa.