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<br />Mortality and Plant Competition <br />50 <br />• aspen <br />40 --- * --------- <br />? -a-- service <br />a 30 -------------------------------- <br />20 -- --------------?" <br />--------------- <br />10 --?-- • <br />0- 1 <br />0 50 100 150 <br />Biomass of Competing Vegetation, gm <br />J <br />Figure 3. Relationship of plant mortality to biomass of competing vegetation. Plots <br />with the highest mortality aspen were from the Yoast site. <br /> a 2WSa <br />Percent Aspen Survival by Site ¦ 2WSb <br />100% 0Y1 <br /> <br /> a Y 2a <br />90% ® Y 2b <br />80% <br />70% <br />60% <br /> <br />so% <br />1 <br />CL <br />400/6- <br />30% <br />20% <br />f <br />10% <br />? <br />, <br />0% <br /> <br /> Irrigation No Irrigation Irrigation No Irrigation <br /> Fabric Fabric No Fabric NO Fabric <br />Figure 4. Aspen survival by site location in response to landscape fabric and <br />irrigation. Note Yoast 2a and 2b had the most competing vegetation biomass. <br />•