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Transplanting Aspen on Reclaimed Coal -Mine Land Using Drip Irrigation <br />2006 Report <br />Research Agreement with Seneca Coal Company <br />04 -CO- 11221616 -042 <br />Robert C. Musselman' and Wayne D. Shepperd <br />USDA Forest Service <br />Rocky Mountain Research Station <br />240 West Prospect Road <br />Fort Collins, Colorado 80526 <br />February 2007 <br />Introduction: <br />• Quaking aspen (Populus tremuloides) is the most widespread tree species in <br />North America (Baker 1925; Preston 1976; Lieffers and others 2001), and thought to be <br />second in worldwide range only to Eurasian aspen (Populus tremula) (Jones 1985a). <br />Aspen is found in most of eastern Canada and the U.S. (except the Southeast), <br />throughout the upper Midwest and Lake States, across sub - boreal Canada and Alaska, <br />in the Rocky Mountains from Canada through the U.S. and into northern Mexico, and in <br />mountain ranges paralleling the west coast from Alaska through British Columbia, <br />Washington, Oregon, California, and Mexico's northern Baja California (Preston 1976). <br />The species is most abundant in the central provinces of Canada and in Colorado and <br />Utah in the U.S. (Jones 1985a; Lieffers and others 2001). In much of the western U.S., <br />aspen is a mid - elevation shade - intolerant species which is a relatively minor component <br />of more widespread conifer forests. <br />Aspen is an important tree species throughout the western United States. One of <br />the few broad - leaved hardwood trees in many western forests, it is a valuable ecological <br />component of many landscapes, occurring in pure forests as well as growing in <br />• ' rmusselman @fs.fed.us <br />