Impact Of Spacing On Width and Basal Area Of Juvenile and Mature Wood In <i>Picea Mariana</i> and <i>Picea Glauca</i>
Keywords:Juvenile wood, mature wood, spacing, Picea mariana, Picea glauca
AbstractTen trees of Picea mariana (Mill.) B.S.P. and Picea glauca (Moench.) Voss grown at each of three spacings — 1.8 m x 1.8 m, 2.7 m, 2.7 m, and 3.6 m x 3.6 m —were randomly selcted for study of impact of spacing on juvenile and mature wood width. The plantation located in northwestern Ontario was established in 1951 and was sampled in 1989. Tree diameter and tree basal area at breast height, juvenile and mature wood width, both as a ring count and as a linear measurement, basal area and its percentage of juvenile and mature wood, and growth rate in juvenile and mature wood were measured. Data were analyzed with an F-test and the Student-Newman-Keuls test. Correlation coefficients among various variables were also calculated. It was found that impact of spacing on wood properties is more pronounced in Picea glauca, which is considered a fast-growing tree in comparison to Picea mariana, than in P. mariana. The number of growth rings in juvenile wood of P. mariana and P. glauca were counted as 14 to 16 growth rings and 12 to 16 growth rings, respectively, depending upon the spacing. Statistically, there are no differences in juvenile wood growth rings of P. mariana at various spacings, but analysis shows more growth rings in P. glauca juvenile wood at the widest plantation spacing. A tendency of increasing juvenile wood width with increasing spacing was observed. The percentage of juvenile wood basal area was 37% to 62% in P. glauca. A positive relationship between the percentage of juvenile wood basal area and the plantation spacing was found in P. glauca but not in P. mariana. In P. mariana, the percentage of juvenile wood basal area was 50% and was independent of spacing. Growth rate of juvenile wood in both species shows a positive relation with the spacing. The growth rate in juvenile wood is two to three times higher than that of mature wood. The impact of spacing on the properties of mature wood is similar to that of juvenile wood, except that mature wood width in P. mariana shows no difference among spacings. It is concluded that plantation spacing has various degrees of impact on juvenile and mature width, and its impact is also species-specific.
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