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n <br />U <br />Figure 5. Survival of aspen in response to landscape fabric and irrigation. <br />Landscape fabric resulted in significant increases in the aspen survival (Fig. 5), <br />terminal leader growth (Fig. 6), and stem caliper (Fig. 7). Irrigation significantly increase <br />stem caliper, but not terminal leader growth. The relationship of terminal leader growth <br />• and basal caliper in relation to landscape fabric was dramatic and significant. The <br />response of aspen to irrigation was statistically significant only for caliper growth, and <br />the response was considerably less to irrigation than to landscape fabric. <br />Average Aspen Terminal Leader Growth <br />20 <br />16 <br />16 c <br /> <br />14 <br />E 12 3 t hihx <br /> <br />10 <br />o <br />i <br />6 ! <br />t: :;7 <br />6 <br />4 Y <br /> <br />0 " <br /> <br /> Irrigation No Irrigation Irrigation No Irrigation <br /> Fabric Fabric No Fabric No Fabric <br />Figure 6. Relationship of terminal leader growth of aspen to landscape fabric and <br />irrigation.