Abstract
Rates of photosynthesis, respiration, and transpiration in Douglas-fir seedlings that grew from seed collected in a wet and a dry site were determined under conditions of variable soil-moisture stress. Photosynthetic rates declined sharply after soil-moisture stress of 1 atm was reached, with no major differences between seedlings from the two sources. At both high and low tensions of soil moisture, respiration and transpiration rates were higher for seedlings from the wet site than for those from the dry site. Seedlings from the xeric environment had higher photosynthetic rates at high relative turgidities and lower at low relative turgidities than seedlings from the mesic sites. Over a wide range of soil-moisture tensions, relative turgidity of seedlings from the xerophytic source varied less than that of seedlings from the mesophytic source.
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