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Branches of nine-year-old loblolly pine trees grown in a 2 × 2 factorial combination of fertilization and irrigation were exposed for 11 months to ambient, ambient + 175, or ambient + 350 μmol mol −1  CO 2 . Rates of light-saturated net photosynthesis ( A  max ), maximum stomatal conductance to water vapor ( g  max ), and foliar nitrogen concentration (% dry mass) were assessed monthly from April 1993 until September 1993 on 1992 foliage (one-year-old) and from July 1993 to March 1994 on 1993 foliage (current-year).

Effects of carbon dioxide, fertilization, and irrigation on photosynthetic capacity of loblolly pine trees