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Seneca IIW 2006 <br /> <br />Vegetation Type Mean Herbaceous Production <br />(Ib/ac) ° % of Affected Area <br />Sagebrush/Snowberrya 657 31.3 <br />Mountain Brushy 557 34.5 <br />Aspen Woodlands 764 11.0 <br />Steep Mountain Brushy 473 12.8 <br />Alkali Sage/West Whtgrs. a 716 10.4 <br />1999 Reclamation Area 944 NA <br />2002 Reclamation Area 1204 NA <br />2004 Reclamation Area 566 NA <br />Herbaceous production performance standard (weighted by percent of affected area) = 617 Ib/ac. <br />90 percent of performance standard = 0.9 x 617 = 555 Ib/ac <br />° Seneca IIW extended reference area values from data collected in 2006 <br />° As corrected for production by annuals in excess of 10% to total production <br />As can be seen, the observed herbaceous production in the 1999 and 2002 reclaimed areas <br />greatly exceeded the production standard. Even the two-year old 20D4 area, having had a large <br />deduction for annual species exceeded the standard. <br />Woody Plant Density <br />BACKGROUND DENSITY <br />2006 data from the 1999 reclaimed area indicate the average presence of 223 woody plant stems <br />per acre. In 2001 the number for woody plants was only 32 stems per acre, and thus a rise of <br />about 7x in woody plant density has occurred from the two-year old stage to the 7-year old stage. <br />Between 2001 and 2006, the numbers of the species that had been present in 2001 <br />(chokecherry, bitterbrush, and mountain snowberry) all substantially increased but several other <br />shrub species have appeared including serviceberry, rubber rabbitbrush, Gambel's oak, big <br />sagebrush, and Woods' rose. Some of these may have been planted as nursery stock and <br />some may have volunteered via natural propagation. The tall shrub species though surviving <br />have yet to make sufficient top-growth to begin to achieve their full potential height. <br />In the 2002 reclamation area, the 2006-observed woody plant density level of 850 stems per acre <br />is very encouraging for such young revegetation. Perhaps the high rate of establishment here <br />reflects the fact that 2002 was a dry year that saw reduced herbaceous competition during the <br />first few months after shrub germination. Note that this area has had high shrub numbers since <br />17 <br />