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SECTION 4:TREE MONITORING RESULTS <br /> ' survivorship in this planting area in Year 3 2009 was 80percent, <br /> previous monitoring year (2008) survivorship rate of 82 percent In 20071 thiswasthe only lower than y <br /> ' planting sub area with a percent survivorship lower than the 80 percent threshold. In 2008 <br /> and 2009,this site met the 80 percent survivorship goal. However,this site continues to have <br /> the highest mortality rate of all six planting areas (Table 4-1). <br /> The average heath and vigor score recorded in Year 3 (2009) was 1.7,a little more than <br /> halfway between"low" and "medium" ranks. This health and vigor score was the lowest of <br /> ' all six sub areas. <br /> Year 4 (2010) <br /> This site continues to have the highest mortality rate of all six planting sub areas (Table 4-1), <br /> likely a result of poor soils and surface disturbance. In Year 4 (2010), 11 trees were recorded <br /> as dead in Area D (or approximately 22 percent of the 50 trees planted) (Appendix A). This <br /> value is below the 80 percent survivorship criterion. Area D is the only planting sub area in <br /> Year 4 (2010) that failed to achieve this success criterion. <br /> Similar to previous monitoring years,black willows had the highest mortality rate (6 trees <br /> recorded as dead) at this site. Three box elder and two valley oak also died (Appendix A). <br /> The willows and box elder may still have a live root-stock,and could re-sprout from the <br /> base,but this cannot be determined at this time. <br /> The average percent survivorship in this planting area in Year 4 (2010) was 78 percent, <br /> slightly lower than the previous monitoring year (2009) survivorship rate of 80 percent <br /> (Table 4-2). Tree survivorship in 2008 was 82 percent, slightly exceeding the success <br /> criterion. In 2007, survivorship was 78 percent,below the 80 percent survivorship success <br /> criterion. <br /> The average health and vigor score in this planting sub area in Year 4 (2010) is 1.6. This is <br /> slightly lower than the Year 3 (2009) score of 1.7 and is also the lowest score recorded in any <br /> of the planting sub areas in Year 4 (2010). The Year 4 (2010) score of 1.6 corresponds to a <br /> little more than halfway between"low" and "medium" ranks. The health and vigor scores <br /> for this planting sub area in monitoring Years 1 and 2 (2007 and 2008)were also low (1.5 and <br /> ' 1.4) (Table 4-2). <br /> Year 5 (2011) <br /> In Year 5 (2011), the average plant survivorship rate was 76 percent,the lowest of all six <br /> planting sub areas (Table 4-1),likely a result of poor soils and surface disturbance (e.g., <br /> compaction).This percentage is slightly lower than the Year 4 (2010)plant survivorship (78 <br /> ' percent). In Year 5 (2011),12 trees were recorded as dead in Area D (or 24 percent of the 50 <br /> trees planted) (Appendix A). This survivorship value is below the 80 percent survivorship <br /> objective. Area D is the only planting sub area in Year 5 (2011) that failed to achieve this <br /> goal. <br /> Similar to previous monitoring years,black willows had the highest mortality rate (6 trees <br /> recorded as dead) in this planting area. Additionally,three box elder, two valley oak,and <br /> one Fremont cottonwood were noted as dead in Year 5 (2011) (Appendix A). The willows, <br /> box elder, and Fremont cottonwood may still re-sprout from the root-stock. <br /> 4-13 <br />