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<br />moisture through the middle range of moisture availability <br />will affect growth and biomass, but do not have a controlling <br />impact on composition of the plant community. <br /> <br />lilt would require a significant increase in moisture supply <br />over a middle- to long-term period in order that competing <br />plants would invade an area and push existing species <br />out. <br /> <br />"Small shifts in species may occur due to late-lying snowbanks <br />at small, localized sites if the wind and other snow-depositing <br />controls extend the same snowbank each season during an <br />extended research period. Plants at the edge and downslope <br />of an extended snowbank will increase growth somewhat due to <br />the increase in moisture from the melt. However, this <br />effect could be offset to a degree, or entirely, by decreases <br />in soil temperature. During years within the average <br />spectrum, no noticeable effects will occur. In other than <br />average periods, some increase or decrease in plant growth <br />may be detectable, but no change in composition would be <br />expected." [8, p. 105, et seq.] <br /> <br />The Skywater Programmatic Final Environmental Statement reached the <br />following conclusions with regard to short-term, research mode (random- <br />ized) cloud seeding on herbaceous vegetation: <br /> <br />liThe study situations encompassed seasons of naturally heavy <br />and naturally 1 ight snowfall, and of naturally early and <br />naturally late snow cover. In addition, artificial snow <br /> <br />29 <br />