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SECTION 4:TREE MONITORING RESULTS <br /> 4.3 Area AA <br /> Area AA is located adjacent to an area of standing water that was caused by and is now <br /> maintained by a levee break. Because groundwater conditions are high, only trees <br /> recommended for the lower planting zone were installed (Fremont cottonwood and black <br /> 1 willow). A total of 23 trees were planted in this area. <br /> Year 1 (2007) <br /> One Fremont cottonwood died in this planting area in 2007. The survivorship rate for this <br /> sub area totaled 96 percent, the second highest of all the planting areas during Year 1 (2008) <br /> monitoring. The average health and vigor score in 2007 was 2.2, slightly greater than a <br /> "medium' rank. <br /> Year 2 (2008) <br /> Results of Year 2 (2008) monitoring were almost equivalent to results from Year 1 (2007). <br /> The Fremont cottonwood that died in this planting area during 2007 was not replanted, and <br /> this tree was also included in the mortality counts for 2008. The survivorship rate for this <br /> sub area was the same as that observed in 2007 (96 percent). The total health and vigor <br /> scores in 2008 (51) were very similar to those calculated for 2007(50). The average health <br /> and vigor score for 2008 was 2.2,the same average score as calculated in 2007. However,the <br /> health and vigor score values for Fremont cottonwood increased slightly and willow <br /> decreased slightly compared to the previous monitoring year. <br /> ' Year 3 (2009) <br /> One Fremont cottonwood within this planting area was recorded as dead during Year 3 <br /> (2009) monitoring (Appendix A). This tree died in 2007 and was not replanted. Therefore,it <br /> has been included in tree mortality counts in all three monitoring years. No additional trees <br /> (out of a total of 23 planted) died in Year 3 (2009)within this planting area.The Year 3 <br /> survivorship rate within this planting area is 96 percent. This is the same survivorship value <br /> recorded in previous monitoring years (Table 4-1). <br /> The average health and vigor score for 2009 in this planting area was 2.4,slightly higher <br /> than the score calculated for Years 1 and 2 (2.2 in both years) (Table 4-2). <br /> Year 4 (2010) <br /> This planting sub area was one of two planting sub areas with 100 percent survivorship in <br /> Year 4 (2010) (Appendix A). One Fremont cottonwood was recorded as dead in Year 3 <br /> (2009) (Appendix A). In Year 4 (2010), growth was noted stump-sprouting near the base of <br /> this cottonwood,and this new growth was counted as a live tree in Year 4 (2010) <br /> (Appendix A). <br /> ' The average health and vigor score recorded in 2010 was 2.4 (Appendix A),the same value <br /> calculated in 2009 (Table 4-2). This score is roughly in between a "medium" and "high" <br /> rank. Fremont cottonwood in this planting area had lower health and vigor scores (2.2) than <br /> the black willows (2.6) (Appendix A). Lower health and vigor scores for the cottonwoods in <br /> this planting area are mainly due to"leaf scorch" (leaf margins that appeared"burned"). <br /> 4-7 <br />