Fact Sheet 2006-3027
U.S. GEOLOGICAL SURVEY
Fact Sheet 2006-3027
Figure 4. Basal area of Fremont cottonwood, Goodding willow, and tamarisk in relation to streamflow permanence of San Pedro River sites, Arizona. Each data point represents a site. Data shown for the 16 biohydrology study sites in the San Pedro Riparian National Conservation Area, and for 12 sites in the Lower San Pedro Basin, Arizona (Lite, 2003).
For more information about USGS activities in Arizona, visit the USGS Arizona Water Science Center home page.