Abstract A previously ephemeral stream in southeastern Wyoming has been used since 1985 to convey a portion of the City of Cheyenne's water supply. This study was initiated to evaluate the response of aspen (Populus tremuloides Michx.) density, and shrubby cinquefoil (Pentaphyloidesfloribunda Pursh.) density and canopy cover to streamflow augmentation and altered groundwater levels. Depth-to-groundwater suitability relationships were investigated for both spedes.
Aspen density declined significantly as a result of streamflow augmentation on sites that became saturated or inundated for several consecutive growing seasons. Shrubby cinquefoil density also decreased significantly where the soil was saturated or inundated for several consecutive growing seasons. Conversely, shrubby cinquefoil canopy cover increased on one site as a result of flow augmentation
Both aspen and shrubby cinquefoil showed a wide range of tolerance for groundwater levels, but neither showed a distinct relationship to depth to groundwater. Other environmental factors may play a significant role in determining the distribution of these species.
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