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• <br />• <br />Survival was related to biomass of competing vegetation for aspen, but not for serviceberry (Fig. 3). <br />Mortality averaged about 20% for serviceberry, regardless of treatment. Mortality of aspen varied from <br />about 8% to 45% for aspen, and was related to biomass of competing vegetation. The response varied <br />greatly by site (Fig. 4), and was apparently related to surrounding vegetation that competed with aspen tier <br />water and this affected survival. Yoast plots had the highest biomass of competing vegetation, with the <br />highest biomass and aspen mortality in Yoast Blocks I and 2 that were in the same fenced area. <br />Serviceberry plants were smaller, suggesting it took less water for them to survive. <br />50 <br />JS 40 <br />_ to <br />-I a 30 <br />ev <br />20 <br />° 10 <br />0 <br />0 <br />Mortality and Plant Competition <br /> • <br /> ¦ <br /> <br /> <br />• <br /> <br /> • <br />• -aspen <br />s servicebery <br />¦ <br />50 100 150 <br />Biomass of Competing Vegetation, gm <br />Figure 3. Relationship of plant mortality to biomass of competing vegetation. Plots with the highest <br />mortality aspen were from the Yoast site. <br />100% <br />9096 <br />80% <br />70% <br />W% <br />E <br />°u 50% <br />m <br />IL <br />ao% <br />W% <br />20% <br />10% <br />0% <br />Irrigation No Irrigation Irrigation No Irrigation <br />Fabric Fabric No Fabric No Fabric <br />a 2WSa <br />¦ 2WSb <br />.Y1 <br />2a <br />2b <br />0 1 figure 4. Aspen survival by site location in response to landscape fabric and irrigation. Note Yoast 2a <br />Percent Aspen Survival by Site