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College of Forestry
Effect of Density on Tree Form
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7 year old alder planted at 100tpa (left) and 1200tpa (right). Near Darrington, WA.
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6 year old alder planted at 230tpa (left) and 600tpa (right). Near Forks, WA
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13 year old alder planted at 100tpa. Note large branches extending to the ground. Near Sedro Wooley, WA
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13 year old alder planted at 230tpa. Note full, large crown. Near Sedro Wooley, WA
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100tpa/12 years old. Note brushy, limby tree form. Near Ryderwood, WA
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1200tpa/12 years old just thinned to 230tpa. Note straight, clear stem and small limbs. Near Ryderwood, WA
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9 year old alder planted at 1200tpa. Note straight stems, small crowns. Near Coombs, BC
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