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• Average Aspen Caliper Growth <br />40 <br />3.0 <br />E 25 <br />E <br />20 <br />C?15, <br />10 <br />06 <br />00. <br />IrrigatMm No Irrigation Irrigation No Irrigation <br />Farrn- Fabric No Fabric No Fabric <br />Figure 7. Relationship of stem caliper growth of aspen to landscape fabric and irrigation. <br />Landscape fabric increased the amount of soil moisture available to the plants (Fig. 8), which in turn <br />provided more favorable leaf water potential (Fig. 9) and subsequent increased growth ofaspen. <br />Photosynthesis was also higher on aspen growing on landscape fabric (data not shown). Soil moisture was <br />290/6 higher under the landscape fabric compared to no fabric. <br />• Average Soil Moisture by Landscape Fabric <br />25 <br />Fabric <br />20 <br />e <br />L 15 <br />P, <br />rA <br />0 <br />0 10 <br />N <br />5 <br />0 1 <br />Treatment <br />Figure 8. Soil moisture with or without landscape fabric. <br />•