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Shepperd, W.D.; Reichert, D.R.; Mata, S.A. 2004. Overwinter storage of carbohydrate <br />in aspen. Transactions of the Western Section of the Wildlife Society. 40.45-48. <br />Shepperd, W.D.; Mata, S.A. 2005. Planting aspen to rehabilitate riparian areas: a pilot <br />study. RMRS-RN-26. Fort Collins, CO: U.£.. Department of Agriculture, Forest <br />Service, Rocky Mountain Research Station. 5 p. <br />Siemens, J.A.; Zwiazek, J.J. 2003. Effects of water deficit stress and recovery on the <br />root water relations of trembling aspen (Populus tremuloides) seedlings. Plant <br />Science 165: 113-120. <br />Strain, B.R. 1964. Physiological and morphological variability of quaking aspen <br />clones. Dissertation. University of California, Los Angeles. 156 p. <br />Strong, T.; Hansen,E.A. 1991. Response of threes Populus species to drought. <br />Research Paper NC-302. USDA Forest Ser/ice. North Central Forest Experiment <br />Station. St. Paul, MN, 9 pages. <br />van den Driessche, R.; Rude, W.; Martens, L. 20113. Effect of fertilization and irrigation <br />on growth of aspen (Populus tremuloides Michx.) seedlings over three seasons. <br />Forest Ecology and Management 186: 381 ;389. <br />Wyman, J.; Bruneau, A.; Tremblay, M.F. 2003. h9icrosatellite analysis of genetic <br />diversity in four populations of Populus tremuloides in Quebec. Canadian Journal <br />of Botany. 81: (4) 360-367. <br />Statement of Work <br />Issue Identification: This project specifically addresses the issue of finding <br />ways to successfully plant aspen on reclaimed surface mines in high altitude arid <br />environments in the western United States. Because aspen reproduces by root <br />suckering and parent roots are disturbed in the mining process, planted aspen <br />seedlings or transplanted root sprouts do not have an extensive root system to access <br />water and nutrients for rapid growth. Therefore, eve propose to test the use of <br />supplemental irrigation to help establish planted <~spen and to compare growth and <br />survival of three types of aspen stock. We also plan to monitor soil and water <br />conditions and test the effect of controlling competing vegetation on planting success. <br />Work Tasks: <br />Weather and Soil Data - A weather station recording temperature, relative <br />humidity, and precipitation to a datalogger is inst<~Iled at the study site. After the <br />danger of frost has passed in mid-May, the system must be filled with water and <br />tested for leaks and proper valve and emitter operation. All filters, screens must be <br />disassembled, cleaned, and flushed of debris. The controller program must be <br />revised for new watering sequences and checkecl for proper operation. Once <br />irrigation has started, the irrigation system operation must be closely monitored <br />throughout the growing season to insure that emitters are operating properly and that <br />no leaks have developed. Any breakdowns must be repaired immediately. The <br />system will be monitored any time personnel are ~on-site and data will be downloaded <br />monthly and taken to Ft. Collins for summary and analysis. <br />During the operating season water from the irrigation drippers will be collected <br />at random in a pan and measured for volume at some of these locations before <br />delivery to the plant to verify irrigation treatment levels. Soil moisture will be <br />monitored by periodically collecting gravimetric grab samples within each soil <br />treatment. Differences in nutrient availability behn/een roto-cleared, dozer cleared, and <br />16 <br />