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a <br />10 <br />Clipped herbaceous and shrub vegetation samples were composited and <br />bagged from three of the four sites at each location. In addition, terminal <br />twigs of approximately 10 an each of lodgepole pine (Pines contorta were <br />sampled at these same sites and kept separately. Lodgepole pine twigs had not <br />been previously sampled in 1976. It was believed that these additional <br />sartples might be more corparable among locations as herbaceous sartples were <br />confounded with varying species cafposition. All vegetation samples were <br />returned to the lab, oven dried at 60 C, ground to pass through a 407mash <br />screen, and stored in glass jars prior to chemical analysis. <br />Analytical chemical analysis of soil and vegetation samples collected in <br />1979 were coormducted by Front Range Lab, Inc. of Fort Collins, Colorado. This <br />lab had previously analyzed the 1976 samples. Use of similar procedures and <br />equipment was considered desirable for reducing laboratory variance. However, <br />Frcnt Range Lab was no longer in business in 1985; therefore, all samples <br />rnllected in 1985 were analyzed by the Colorado State University Soil Testing <br />Lab. The change in laboratories between 1979 and 1985 undoubtedly resulted in <br />additional variation among sample years. Various determminations made and <br />methodology utilized in characterization of soil and plant parameters are <br />listed in Table 2. All original data for 1976, 1979, and 1985 samples are <br />included in Appendix H. <br />Soil parameters evaluated represented the pH and conductivity (soluble <br />salts) of the soil, essential plant nutrients, trace elemments, and a few toxic <br />constituents. Measurable changes in any of these parameters mmight result in <br />soil conditions which could affect plant growth. The chemical constituents <br />monitored in vegetation aze those which might change as a result of ndll <br />