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HOWARD B. KRIEREL 



Figure 1 . Pinus strobus stand with natural reproduction in the 

 stand openings, Waushara County, Wisconsin (photo courtesy of 

 Wisconsin State Department of Agriculture) . 



increases in proportion to light intensity above this point, unless some 

 other factor becomes limiting. This early growth is comparatively slow, 

 to about 1.5 m in the first 8 to 10 years (Fig. 1). During the subse- 

 quent 20 years, height growth of dominant trees may be rapid, sometimes 

 1 m but usually about 0.5 m per year (Figs. 1 and 2). The estimated 

 yield of fully stocked, pure stands varies, depending on site index, from 

 8,000 to 38,000 board feet per acre 1 (110 to 530 m 3 /ha) at 50 years, and 

 from 40,000 to 78,000 board feet per acre (560 to 1100 m 3 /ha) at 100 

 years (Wilson and McQuilkin, 1963) . 



Eastern white pine has a long life, commonly 200 to 300 years when 

 undisturbed (Fig. 3), reaching a maximum height of about 65 m. 



Growth of eastern white pine in plantations varies with seed source 

 and planting locality. Early results of cooperative provenance tests 

 (ages 3 to 8 years) showed that trees of southern and central Appalachian 

 Mountain origins outgrew others in field tests in Georgia, North 

 Carolina, Virginia, Kentucky, Ohio, Indiana, Illinois, Iowa, and lower 

 Michigan (Sluder, 1963; Wright , Lemmien, and Bright, 1963; Funk, 1965; 

 King and Nienstaedt, 1968). In two 13-year-old field tests in New England, 

 local sources had the best survival and growth. The farther the collection 

 was made from the test area and the more diverse the site and climate, the 



1 International 1/2 inch rule. 



