Water-level variations and their effects on tree growth and mortality and on the biogeochemical system at the phytoremediation demonstration site in Fort Worth, Texas, 1996-2003

OCLC Number: (OCoLC)57624940 Subject: Trees -- Effect of water levels on -- Texas -- Fort Worth. Excerpt: ... Effects of Water-Level Variations on Tree Growth and Mortality 11 Roaring N Springs Road 587.5 590.5 Golf 590.0 cart 587.0 path 589.5 589.0 588.5 588.0 Golf course Branch Farmers Creek Base from U.S. Air Force, Aeronautical Systems Center 0 50 100 FEET EXPLANATION Estimated drawdown, in inches Approximate extent of tree plantations Less than 0.9 588.0 Water-table contour - Shows altitude of water table, 1.0 to 1.9 in feet above NAVD 88. Contour interval 0.5 foot 2.0 to 2.9 Well 3.0 to 3.9 Nested wells 4.0 to 4.9 Figure 7. Estimated drawdown attributed to planted trees, June 22, 1998. to the aquifer. However, irrigation might have caused a reduc-opy diameter, and trunk diameter several times during the first tion in the volume of water extracted from the aquifer by the three growing seasons by SAIC. Overall, both whips and cali-trees. pers showed a substantial increase in all properties measured. Only two of the 52 whips and three of the 51 calipers did not survive the first 3 years. Effects of Water-Level Variations on Tree Mean trunk diameter increased from less than 1 in. to about 2 in. for the whips and from less than 1.5 in. to 3.15 in. for Growth and Mortality the calipers during the first 3 years of the study. Although the calipers generally were taller than the whips during the first Rates of tree growth at the site were documented to deter-growing season, by the end of the third growing season ( 1998 ), mine the effectiveness of the phytoremediation system. Fifty-two whips and 51 calipers were measured for tree height, can-the whips were about equal to the calipers in height. The whips