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1.8 <br />1.6 <br />1.4 <br />1.2 <br />c <br />a 1.0 <br />d <br />? <br />L p <br />O.V <br />R <br />? <br />0.6 <br />0.4 <br />0.2 <br />0.0 <br />1860 1880 1900 1920 1940 1960 1980 2000 2020 2040 2060 <br />o Aspen 0 Bristle_Cone_Pine ? Douglas_Fir 0 Lodgepole_Pine ? Ponderosa_Pine a Spruce_Fir <br />Figure 9. The contribution to total water yield made by the six species account for 95 <br />percent of the total water yield from the forested portion of all NFS land in the South <br />Ptatte River Basin. Spruce-fir, lodgepole pine, and ponderosa pine dominate the total <br />production and account for most of the changes in water yield over time. In this <br />presentation, spruce-fir is allowed to change with time; otherwise it would remain <br />constant at a level equivalent to the 2000 level from 1860 to 2000 and then decline as <br />indicated from 2000 (1997) to 2060. <br />20 <br />a <br />15 <br />o° <br />0 <br />0 <br />X 10 <br />a <br />sp <br />u <br />Q <br />5 <br />0 <br />s <br />? <br />m <br />? <br />4 ? <br />m <br />a <br />? <br />2 <br />0 <br />1860 1880 1900 1920 1940 1960 1980 2000 2020 2040 2060 <br />? Seed/Sap ? Pole E3 Saw 0 Water Yetd (in) <br />Figure 10. Age class distributions and resultant water yield for aspen from 1860 to 2060. <br />Future streamflow declines (2020-2060) will occur as current stands continue to evolve <br />into the sawtimber class. <br />16 2/2/2007