Seasonal photosynthesis and water relations of juvenile loblolly pine relative to stand density and canopy position
To assess the effects of stand density and canopy environment on tree physiology, we measured gas exchange responses of the same needle age class of 16-year-old loblolly pines (Pinus taeda L.) in thinned (512 trees ha-1) and non-thinned treatment plots (2,863 trees ha-1) in central Louisiana. Physiological data were collected in the upper and lower canopy positions on 26 sunny days between July 1996 and June 1997 (one-half of the leaf life span). Mean net photosynthesis was highest (4.3 mol m
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