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• Landscape fabric resulted in significant increases in the aspen survival (Figures <br />10-11), terminal leader growth (Fig. 12), and stem caliper [basal diameter] (Fig. 13). <br />Irrigation significantly increase stem caliper, but not terminal leader growth. The <br />response of terminal leader growth and basal caliper to landscape fabric was dramatic <br />and significant. The response of aspen to irrigation was statistically significant only for <br />caliper growth, and the response was considerably less to irrigation than to landscape <br />fabric. Senescence seemed to be delayed in aspen grown on landscape fabric (Figures <br />14 -15), but this parameter was not quantified. <br />• <br />• <br />Figure 11. Survival of aspen in response to landscape fabric and irrigation. <br />20 <br />Figure 10. Aspen at upper Yoast planting site, left is June 2008, right is October <br />2008. Vigor and biomass of competing vegetation was high; survival of aspen without <br />the landscape fabric was low. <br />Aspen Survival <br />Fors <br />ms <br />ms <br />I <br />a <br />ms <br />p� <br />1sv. <br />xsc <br />cos. <br />me <br />ma.sm <br />xob,gwm �.ym, xo `.4+sm <br />Fable <br />fable eo Ahk fb Fbk <br />Figure 11. Survival of aspen in response to landscape fabric and irrigation. <br />20 <br />Figure 10. Aspen at upper Yoast planting site, left is June 2008, right is October <br />2008. Vigor and biomass of competing vegetation was high; survival of aspen without <br />the landscape fabric was low. <br />