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naturally in nearby aspen stands. Means: examine growth, survival, and <br />physiological response of aspen under different irrigation treatments. <br />Quantify physical and chemical differences between roto-cleared and dozer- <br />cleared topsoils. We also hope to determine if differences in aspen growth <br />observed on these two soil types in 2005 will still be apparent in 2006 and <br />2007. Means: quantify soil physical and chemical differences of the two soil <br />types, and compare to aspen response. <br />Identify specific differences in the survival, growth rates, and physiologic <br />condition of three types of aspen stock -bare-root transplants, potted nursery <br />grown seedlings, and sprouts arising from root segments transported in <br />replaced topsoil. Means: examine growth and physiological differences <br />between the three types of aspen stock. <br />Associate observed differences in growth and survival of aspen with <br />physiologic condition of trees. Means: Conduct physiological (photosynthesis, <br />transpiration, and water stress status) measurements on different aspen stock <br />growing on different soil type <br />19 <br />