Abstract
Species of a xeric scrub oak community (scrub oak, Quercus gam.belii; sagebrush, Artemisia tridentata; bitterbrush, Purshia tridentata) have lower seasonal water potentials than species of a mesic streamside habitat (box elder, Acer negundo; bigtooth maple, Acer grandidentatum; creeping barberry, Berberis repens). The restriction of box elder to mesic sites is, in part, a function of its physiological responses to moisture stress. Positive net photosynthesis of box elder ceases at water potentials 10 to 15 bars higher than net photo- synthesis of the other five species, and dark respiratory rates of box elder decline more rapidly. The relative photosynthetic and dark respiratory responses to water stress of scrub oak, sagebrush, bitterbrush, bigtooth maple and creeping barberry are apparently not significant factors influencing the distribution of these species.
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