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• with alfalfa hay (A',edicago sativa) during the 1979 growing season and :Lar- <br />vested during the late sunnier. Although harvest records were not available for <br />ttu s site, similar dry land alfalfa fields in t'ris area of Colorado produce <br />between 2000 and 3000 1bs dry weight alfalfa per acre per ye-ir (personal <br />conmunication, 1979, Mr. Thomas Darty, Agricultural Extension Agent, Nnntrose, <br />Colorado). <br />Juniper vegetation type. The juniper caTmunity, characterized by Utah <br />juniper trees (Juniperus osteosperma), co-~rises 1.80 acres on the study area. <br />This type is actually an agricultural sub-type as the herbaceous urderstory <br />is alfalfa hay meadow. Juniper trees within triis agricultural area were <br />well scattered and thus, do not appear to have any affect on the production <br />and species composition of t:~e understorl~ vegetation which is a.~ alfalfa <br />field. Tree density is 45.7 trees/acre (a total of 59 trees occur within <br />the type) and basal area averages 737.10 cn2. All trees are Utah juruper. <br />This juniper area represents scattered individual trees in an alfaira field. <br />• (Marian Associates 1979). <br />Riparian vegetation type. The riparian tz~pe conprises 1.93 acres or 1.7; <br />of the total study area. The type occurs along an irrigation ditch and <br />consists of a stall conrnuu ty of conmon cattail (T}roha latifolia), baltic- <br />rush (Juncos balticus), and longstem spikerush (Eleocharis macrostachva) and <br />a wall tree corrrunity. The tree conmtuiitf consists of 11 Chinese elm <br />(ULnus ~*viflora), 13 narrowleaf cottonwocd (Popuius angustifolia,) a.~d 3 <br />plains cottonwood (POpulus sarge7tii). Total density is ~4.5 trees/acre <br />while average basal area is 303.29 cm`. Quantitative cover or production <br />estimates were nit made for this type (Nation Associates 1979). <br />WILDLIFE <br />Data gathered during 1979-1960 wildlife studies at Nucla Mine and site <br />specific information found in the literature are discussed by sajor wildlife <br />oonQonents belv.~. .~ list of vertebrate species positi~~Pi.;~ indertif"led for <br />-13- <br />JUM ~ 1 1989 <br />