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2.4.4 METHODOLOGY <br />• 2.4.4.1 Collection of New Information <br />Vegetation Type Delineation and Mapping <br />Initial vegetation type delineation was made in the office by using color infrared <br />aerial photographs. These types were then transferred to a topographic map with a <br />scale of I" - 400'. Data obtained during reconnaissance surveys were used to name <br />each vegetation type. <br />Affected Area Sampling Design for Production <br />Both one-stage and two-stage sample designs were employed in the sampling <br />reported here. In the one-stage sampling design, an X, Y Grid system was imposed <br />over the area to be sampled. Pairs of random numbers were generated using an HP- <br />25 calculator programmed to generate random numbers. These numbers were then <br />located on the grid. After the sample locations were selected, pacing was used to <br />• locate them in the field. A n exclosure was erected at each sampling location. This <br />method of sampling was used for The Willow/Redtop and Subirrigated Shrub. <br />A two-stage sample design was used to sample the Aspen Woodland, Sage- <br />brush/Snowberry, and Mountain Shrub types. The first-stage samples were 60 feet x <br />60 feet exclosures in which a potential of 720 sample plots (0.5 M x I.0 M) could <br />be located. Seven exclosures were used for the Mountain Shrub vegetation type, six <br />for the Sagebrush/Snowberry type, and five exclosures for the Aspen vegetation type. <br />These first stage samples were randomly located using an X, Y Grid system imposed <br />over the area to be sampled. Pairs of random numbers were generated using an HP- <br />25 calculator programmed to generate random numbers. Second-stage sampling was <br />performed by taking random samples within each of the exclosures, using a 0.5 M x <br />I.0 M quadrat. <br />Production data were obtained by clipping the above-ground current year's <br />growth of shrubs, fortis, and grasses in all sampling quadrats (0.5 M x I.0 M). <br />Harvested specimens were placed in paper bags. The samples were oven-dried at <br />IOSoC for at least 24 hours and then weighed to the nearest tenth of a gram. <br /> <br />Revised 7-81 2.4-9 <br />