Abstract
Rates of net photosynthesis and dark respiration were examined for native and transplanted Pinus ponderosa trees in semi- arid southwestern North Dakota. Effects on photosynthesis of soil mois- ture, light, temperature, local weather conditions, and seasons were evaluated. Seasonal photosynthesis was highest on mild autumn (or occasional cool summer) days when soil moisture was not limiting. Pinus ponderosa exhibited marked physiological plasticity with regard to temperature acclimation. Distribution of pine and grassland com- munities within the study area appeared to be regulated by in situ physiographic differences in both texture and depth of soil. The rela- tively high photosynthetic and growth rates and abundant reproduction in evidence suggested that many of the sites within the study area were favorable for growth of Pinus ponderosa.
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