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II. Urban Forest Cover and Leaf Area <br />Many tree benefits equate directly to the amount of healthy leaf surface area of the plant. Trees cover about 225.3 <br />acres of City of Pleasanton and provide 1228 acres of leaf area. <br />1500 <br />U <br />1000 <br />v 500 <br />J <br />0 <br />�a <br />A <br />�a <br />Stratum <br />Figure 5. Leaf area by stratum, City of Pleasanton <br />In City of Pleasanton, the most dominant species in terms of leaf area are Sycamore spp, Coast redwood, and Coastal <br />live oak. The 10 species with the greatest importance values are listed in Table 1. Importance values (IV) are <br />calculated as the sum of percent population and percent leaf area. High importance values do not mean that these <br />trees should necessarily be encouraged in the future; rather these species currently dominate the urban forest <br />structure. <br />Table 1. Most important species in City of Pleasanton <br />Species Name <br />Percent <br />Population <br />Percent <br />Leaf Area <br />IV <br />Sycamore spp <br />11.7 <br />17.4 <br />29.1 <br />Coast redwood <br />8.6 <br />12.3 <br />20.9 <br />Coastal live oak <br />9.4 <br />8.9 <br />18.3 <br />California valley oak <br />6.2 <br />6.4 <br />12.7 <br />Ash spp <br />4.5 <br />7.2 <br />11.7 <br />Sweetgum <br />4.2 <br />4.7 <br />8.9 <br />Chinese pistache <br />6.9 <br />1.9 <br />8.7 <br />Common crapemyrtle <br />5.9 <br />0.5 <br />6.4 <br />Callery pear <br />3.3 <br />2.4 <br />5.6 <br />Chinese hackberry <br />1.8 <br />2.5 <br />4.3 <br />Page 7 <br />69 of 219 <br />