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-4- <br />or local agricultural extention agents, observation of production, weer <br />and species wmposition on similar sites, etc. (personal comrnuucation, <br />Dr. IzDbert Dorn, Wyoming DEQ, 1979) . <br />Hay meadow species oc~iposition and rover was determined by visual inspection <br />while production was determined through interviews with government agency <br />personnel and local farmers familiar with agricultural production on simi- <br />lar sites in this area of Colorado. The juniper oonznunity, wnsisting of <br />scattered individual juniper trees, was located within the agricultural <br />type (hay meadow) thus the production, Dover and species corposition of <br />the understory vegetation appeared the same as that of the hay meadaa. <br />Therefore, the understory vegetaticn (alfalfa) was not sampled since it <br />was equivalent to, and~a part of, the hay meadow. All trees in this juni- <br />per wmmuLity were quantitatively sampled for density aril basal area deter- <br />minations. The small tree wnmunity along the riparian type was also <br />sampled for tree density and basal area data; the rest of the riparian <br />• type (less than 1 acre) was sampled for species composition. Much of this <br />one acre riparian site was a marsh rontaining standing water, thus vegeta- <br />tive production and Dover estimates for this small area were not possible. <br />The upland sagebrush and grassland type were systematically sattq~led to <br />gather production, rover, frequency and shrub height data for the 1979 <br />growing season. Reference or wntrol plots, approximately 2.5 acres in <br />size, were situated in these two types away from potential disturbance <br />(affected) areas. The exact location of all reference areas are shown <br />on the vegetation cover map (Appendix A). These wntrol sites were selected <br />on the basis of their wntaining vegetation species, soils and topographic <br />aspects generally characteristic of the upland sagebrush and grassland <br />vegetation wnmunities sampled. All control plots were sampled in a <br />L J <br />systematic manner to gather wmparison vegetative production, rover, fre- <br />quency and shrub height aorta for the 1979 growing season. ~mplete phytn- <br />sociological descriptions of all reference areas and of all affected area <br />vegetation types sampled are presented on pages 25-35. <br />VF.GEPATIDN TYPE MAPPING <br />Seven distinct mapping units were .9el.ineated on a topograpluc lx~se ~n<~p at <br />,, ~. <br />• ~ I,j~ <br />