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2007-12-31_REPORT - M1988044
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2007-12-31_REPORT - M1988044
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Last modified
8/24/2016 3:20:26 PM
Creation date
1/4/2008 10:56:35 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M1988044
IBM Index Class Name
REPORT
Doc Date
12/31/2007
Doc Name
Annual Report
From
Southwestern Ecological Services
To
DRMS
Permit Index Doc Type
Annual Fee/Report
Media Type
D
Archive
No
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Note: Density for 2006 was recalculated assuming the same method of sampling was used in 2006 that was used in 2007. <br />Thus, the 2006-2007 change values for density are true when calculated on the same basis. <br />EXCLOSURES- <br />Description: Of the five new exclosures, this one contains the oldest growth. The <br />exclosure is on the north side of an island inhabited by several lazge and very healthy cottonwood <br />trees. The site is reasonably protected by the island from heary flows. Topographically, the exclosure <br />is somewhat different from the other four exclosures. Much of this site is moderately elevated above <br />the stream channel to the west. This slight bench is more elevated than was the case in the <br />cottonwood zone in Exclosure 4. Visually, as seen in the photographs, this exclosure has a much <br />broader distribution of cottonwoods than any exclosure other than Exclosure 1. Furthermore, the <br />cottonwoods appear to have extremely consistent heights with few plants projected above the general <br />blanket of cottonwoods as was seen in Exclosure 3. There is some degree of zonation evident in the <br />distribution with little cottonwood growth in very dry, more elevated zones, or in the wetter area <br />along the western edge of the exclosure. Willow is raze in this exclosure, although willow growth a <br />short distance toward the stream from the western fence line is robust and very dense, although <br />heavily browsed. <br />About 50 to 100 feet north west of this exclosure is the old South Exclosure established in <br />1996 when Schmidt Construction assumed the permit. Exclosure 5 shows some characteristics <br />similaz to the southern end of that exclosure. However, the southern end of that exclosure is very <br />near the stream channel and directly receives heavy flows. Exclosure 5, on the other hand, is <br />protected and more elevated. Topographically, it is similar to the habitat where the rows of ]azger <br />trees were planted in the South Exclosure. But it is quite evident that tree density here far exceeds the <br />density present in the planted azea in the South Exclosure. <br />Results: In this exclosure no willows were encountered in the sampling in 2006 or 2007. <br />Therefore, all the data pertains only to cottonwood. Comparing 2006 to 2007, a few cottonwoods <br />were "lost" in 2007 on transect 1. These are more likely due to minor sampling errors. If the numbers <br />changed at all, the change was very minor. As nearly all the plants are large, a dead plant would have <br />been noticed and none were seen. The gains on transect 2 were four smaller, young plants near the <br />western fence. It is suspected they were there last year, but may have been missed or were just <br />outside of the boundary of the 2006 transect, but were included this year. <br />Gains in height amounted to about two feet on the average. The average cottonwood height <br />now is about six feet with the tallest tree at about 10 feet. However, as the height SSD is about 22 <br />inches, it is apparent that there is a general uniformity in the tree height. The shortest plant measured <br />is about 2.5 feet tall. The statistically average range is from about 4 feet to 8 feet. Few plants were <br />found that were outside that range. <br />2007 Annual Report Coal Creek Wetland Mitigation Permit DA 198811488 Page 21 <br />
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