. A ponderosa pine-lodgepole pine spacing study in central Oregon : results after 20 years. Forest thinning Oregon; Trees Oregon Growth; Ponderosa pine Oregon Spacing; Lodgepole pine Oregon Spacing. 8 12 16 Age (years) —i—i 20 Figure 2—Quadratic mean diameter of trees growing at five initial spacings from age 11 to 20: (A) ponderosa pine and (B) lodgepole pine. 0) a! E "D C CO 0) E o CO k_ "D CO 3 o 10 -. 9 - 8 - El 6x6 7 - ? 9x9 n 12x12 6 - 0 15x15 5 - m 18x18 4 - 3 - 2 - 1 - 0 - 1 1 B. 8 12 Age (years) —r- 20 Height Growth Lodgepole pine grew significantly faster (P<) in hei
. A ponderosa pine-lodgepole pine spacing study in central Oregon : results after 20 years. Forest thinning Oregon; Trees Oregon Growth; Ponderosa pine Oregon Spacing; Lodgepole pine Oregon Spacing. 8 12 16 Age (years) —i—i 20 Figure 2—Quadratic mean diameter of trees growing at five initial spacings from age 11 to 20: (A) ponderosa pine and (B) lodgepole pine. 0) a! E "D C CO 0) E o CO k_ "D CO 3 o 10 -. 9 - 8 - El 6x6 7 - ? 9x9 n 12x12 6 - 0 15x15 5 - m 18x18 4 - 3 - 2 - 1 - 0 - 1 1 B. 8 12 Age (years) —r- 20 Height Growth Lodgepole pine grew significantly faster (P<) in height than ponderosa pine during all three growth periods (table 2). Growth of the mixed pine was generally intermediate between the pure stands. Average height growth ranged from foot per year for pure ponderosa pine at the 12-foot spacing during the first period to feet per year for pure lodgepole pine at the 15-foot spacing during the second period. These growth rates are typical of pine responses in other studies in central Oregon (Barrett 1982, Dahms 1971, Seidel 1985). Spacing had a significant effect (P<) on height growth but only between the 6- and 15-foot spacings and the 6- and 18-foot spacings. Height growth generally increased as spacing increased, but this trend was not as consistent or uniform as the one for diameter growth. Height growth during the first period was significantly less (P<) than during the second or third periods, but no significant growth difference occurred between the second and third periods. Because of the faster height growth of lodgepole pine, this species was significantly taller (P<) than ponderosa pine at all spacings after 20 years (fig. 3). Differences in average height between the two species ranged from a advantage (9 per- cent) for lodgepole pine at the 15-foot spacing to a advantage (35 percent) at the 12-foot spacing. 7. Please note that these images are extracted from scanned pa
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