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The remainder of the swale/drainage type consists of virtually impenetrable thickets of willow. <br />The thickets comprise approximately 2 percent of the swale/drainage type, existing primarily <br />along the CC Ditch. The majority of the willow type ranges in size from approximately 0.1 to 1 <br />acres. In keeping with 1987 procedures, only qualitative estimates of herbaceous and shrub <br />cover were made in this component due to its inherent immeasurability and the lack of <br />pertinent information that would be achieved from quantitative sampling attempts. <br />Plant species frequency or presence was derived by dividing the number of plots or transects <br />at which a species occurred by the total number of plots or transects sampled in each of the <br />three vegetation types for which cover samples were obtained. Products were multiplied by <br />100 to express frequency as a percentage. <br />4.11 Vevietation Production - 1999 Quantitative measurements of vegetation production <br />were made in the sagebrush - 1 (SG -1), sagebrush - 2 (SG -2), sagebrush reference area, <br />dryland pasture reference area, irrigated pasture, irrigated hayland, and swale/drainage <br />vegetation types. <br />In 1999 no range exclosures were present. The observer picked pastures that had not been <br />subjected to current year grazing for sampling. <br />Production data was collected concurrently with measurements of vegetation cover and <br />frequency. In keeping with 1987 procedures, no attempt was made to sample production in the <br />cattail or willow component of the swale/drainage primarily because of immeasurability. <br />Measurements of above -ground plant biomass were made using a 0.25m' square plot in both <br />the graminoid component of the dryland pasture area, irrigated haylands, swale/drainage and <br />irrigated pasture types. A 1.Om2 plot was used in the sagebrush types. Within each production <br />plot, all green, living herbaceous plant material was clipped as close to ground level as <br />possible, separated by lifeform (annual forbs, annual graminoids, perennial (orbs, and <br />perennial graminoids), immediately weighed using a Pesola 41002 field scale, and bagged for <br />laboratory analysis. Shrubs were clipped of annual growth, bagged and weighed. Herbaceous <br />plant material was not sorted in the irrigated pasture samples. In the laboratory, samples were <br />oven -dried at 30°C in a forced draft oven for 72 hours, or until a constant weight was obtained. <br />February 2015 (TR -66) 2.04.10-23 <br />