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Page 13 <br />V. Oxygen Production <br />Oxygen production is one of the most commonly cited benefits of urban trees. The annual oxygen production of a <br />tree is directly related to the amount of carbon sequestered by the tree, which is tied to the accumulation of tree <br />biomass. <br />Trees in City of Pleasanton are estimated to produce 888.4 tons of oxygen per year.⁴ However, this tree benefit is <br />relatively insignificant because of the large and relatively stable amount of oxygen in the atmosphere and extensive <br />production by aquatic systems. Our atmosphere has an enormous reserve of oxygen. If all fossil fuel reserves, all <br />trees, and all organic matter in soils were burned, atmospheric oxygen would only drop a few percent (Broecker <br />1970). <br />Table 2. The top 20 oxygen production species. <br />Species Oxygen <br />Gross Carbon <br />Sequestration Number of Trees Leaf Area <br />(ton)(ton/yr)(acre) <br />Coast redwood 99.37 37.26 2,006 150.81 <br />Sycamore spp 85.96 32.23 2,734 213.45 <br />Coastal live oak 78.96 29.61 2,191 108.69 <br />California white oak 64.36 24.13 1,454 78.73 <br />Chinese pistache 54.96 20.61 1,605 22.83 <br />Ash spp 45.90 17.21 1,045 88.35 <br />Sweetgum 34.67 13.00 977 58.30 <br />Callery pear 33.51 12.57 764 29.02 <br />White mulberry 25.92 9.72 261 23.18 <br />Mugga ironbark 23.57 8.84 87 18.46 <br />Common crapemyrtle 19.93 7.47 1,378 6.50 <br />Tulip tree 19.00 7.12 302 32.12 <br />Deodar cedar 17.81 6.68 339 16.91 <br />Camphor tree 16.22 6.08 215 9.22 <br />Hind walnut 15.92 5.97 275 22.29 <br />Willow-leaved gimlet 11.33 4.25 95 14.79 <br />Holly oak 9.21 3.45 150 10.21 <br />Turkish pine 8.42 3.16 158 12.44 <br />Silver maple 7.95 2.98 123 12.97 <br />Chinese elm 7.79 2.92 117 4.47