The influence of competition and species mixture on plantation-grown white spruce: Growth and foliar nutrient response after 20 years

Luckai, Nancy; Neufeld, Breanne; Morris, David; Reid, Douglas E. B.; Bell, Frederick W.; Shahi, Chander; Meyer, W. L.; Adhikary, Shailendra

doi:10.5558/tfc2014-012

Cited by 7 publications

(2 citation statements)

References 43 publications

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“…These results are consistent with numerous previous studies [14][15][16]21,22]. Interactions at the individual tree level strongly influence dynamics of these mixed species stands [57]. At Siphon Creek, there were no significant differences in H/DBH for white spruce under the treatments which retained aspen, and the range was relatively restricted (78 to 84).…”

Section: Did Aspen Densitysupporting

confidence: 92%

Managed Mixtures of Aspen and White Spruce 21 to 25 Years after Establishment

Kabzems

Bokalo

Comeau

et al. 2015

Forests

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Intimate mixtures of trembling aspen (Populus tremuloides Michx.) and white spruce (Picea glauca (Moench) Voss) are a key feature of western Canadian boreal forests. These mixtures have the potential to produce high yields of merchantable fibre and provide numerous ecological services. Achievement of this potential has been difficult, and often expensive, to realize as a regeneration goal in managed forests. We report 21 to 25 year results of managed mixtures on two study sites where the white spruce was planted, and the density of aspen natural regeneration manipulated within five years of the stand initiation disturbance. On both sites, white spruce mortality did not increase with increasing aspen density. While height and diameter growth of white spruce declined with increasing aspen density, the effect was not entirely consistent across the two sites. Abrasion from aspen branches was the most common source of damage to spruce crowns. Mixed stands had greater merchantable volume production than pure spruce stands based on model projections. Application of aspen harvest at year 60, while protecting the spruce component for a second harvest entry at year 90, was projected to optimize combined yield for the mixedwood stands.

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Section: Did Aspen Densitysupporting

confidence: 92%

Managed Mixtures of Aspen and White Spruce 21 to 25 Years after Establishment

Kabzems

Bokalo

Comeau

et al. 2015

Forests

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“…Similar results were published by Waskiewicz et al (2013) for a mixture of northern red oak/ eastern white pine or by Neufeld et al (2014) for a mixture of white spruce/aspen. Also Rytter and Werner (2007) confirmed the importance of early silvicultural measures (thinning) for young mixed broadleaved stands of birch/aspen/black alder/lime.…”

Section: Discussionsupporting

confidence: 87%

Importance of the first thinning in young mixed Norway spruce and European beech stands

Novák¹,

Dušek²,

Slodičák³

et al. 2017

J. For. Sci.

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Novák J., Dušek D., Slodičák M., Kacálek D. (2017): Importance of the first thinning in young mixed Norway spruce and European beech stands. J. For. Sci., Experimental results from the first thinning in mixed stands are not broadly experienced by forestry practice. To extend the experience with the thinning of a mixed stand, we studied thinned and unthinned mixtures of Norway spruce with European beech on two study sites in the Czech Republic, which represented different conditions: Všeteč (age of 19-35 years) -originally beech dominated site at 440 m a.s.l. and Deštné (age of 17-33 years) -originally spruce with beech site at 990 m a.s.l. Spruce and beech were mixed individually or in small groups. As the for number of trees, mixtures were 35-54% beech and 46-65% spruce at a lower altitude and 7-30% beech and 70-93% spruce at a higher altitude. In the period 1997-2013, we observed annually: mortality, diameter at breast height of all trees and height of trees (minimum 30 individuals) that represented diameter distribution. Results showed that the growth and development of young mixed spruce/beech stands were positively influenced by the first pre-commercial thinning on both locations. The most pronounced effect of thinning consisted in a decreased amount of basal area of dead trees. On control plots, salvage cut accounted for 34 and 46%, while on thinned plots it reached only 7-8% (thinned from above) and 18% (thinned from below) of basal area periodic increment during the 16-year study period. In contrast, diameter distribution was still relatively wide (i.e. an important amount of thin trees was left) at the end of observations on all plots of both study sites. Thinned stands also showed the better static stability (expressed as an h/d ratio) of dominant spruces compared to unthinned stands on both locations. Additionally, thinning supported the spruce share at a lower altitude and the beech share at a higher altitude.

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