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Factors affecting species richness of tree regeneration in mixed-wood stands of central Maine

Problem Addressed: Within-stand spatial variability and tree regeneration
Goal(s)/Objective(s): Species richness of tree regeneration in response to smallscale ecological gradients, and effect of Abies balsamea abundance on species richness of other tree regeneration
Key Findings: Negative associations with A. balsamea regeneration density; large regeneration and overstorey basal area. Positive associations overstorey basal area; small and large regeneration and canopy transmittance.
Recommendation: Tree species diversity in Acadian mixed-wood stands may not be achievable through the use of gap-harvesting alone if the density of understorey Abies balsamea is not reduced
Views: 2348
Downloads: 2
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Forty years of spruce–fir stand development following herbicide application and precommercial thinning in central Maine, USA

Problem Addressed: Long-term stand dynamics for northern forests
Goal(s)/Objective(s): Evaluate the long-term effects of herbicide release and PCT on stand composition and structure; test assumptions about the effects on mixedwood stands
Key Findings: Early herbicide application created softwood-dominated mixedwood stands over the long term; PCT more than doubled merchantable softwood volume
Recommendation: Early PCT dramatically influences the development of spruce-fir stands
Views: 2161
Downloads: 4
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Long-term response of spruce–fir stands to herbicide and precommercial thinning: observed and projected growth, yield, and financial returns in central Maine, USA

Problem Addressed: Long-term growth and yield responses from controlled experiments that include both herbicide application and precommercial thinning.
Goal(s)/Objective(s): Use 40-year growth and yield responses of spruce–fir stands to combinations of early herbicide and PCT to calibrate the Forest Vegetation Simulator (Northeast Variant).
Key Findings: Highest stumpage values resulted from combined herbicide and PCT treatments, followed by PCT-only and then herbicide-only.
Recommendation: Good financial returns are possible over the long-term from early investments in herbicide and PCT treatments in Maine spruce–fir stands.
Views: 2391
Downloads: 6
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Improving the Composition of Beech-Dominated Northern Hardwood Understories in Northern Maine

Problem Addressed: American beech dominance following natural disturbance and shelterwood and selection harvesting
Goal(s)/Objective(s): Identify glyphosate rate and surfactant concentration that produce maximum beech control and minimal injury to desirable hardwood species
Key Findings: Dominant hardwood species differed substantially in their susceptibility to the treatments in the following decreasing order: beech,  striped maple,  yellow birch,  red maple,  sugar maple.
Recommendation: this relatively low-cost and effective treatment can substantially improve the understory composition of northern hardwood stands
Views: 2409
Downloads: 4
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Arboreal arthropod associations with epiphytes following gap harvesting in the Acadian forest of Maine

Problem Addressed: Sensitivity of Collembola, Araneae, and Diptera to forest management.
Goal(s)/Objective(s): Further examination of gap harvesting on Collembola and their associations with epiphytes and arthropods.
Key Findings: The correlation among bryophytes, Collembola (springtails) and Araneae (spiders) suggest a potential trophic interaction where arboreal spiders, during early developmental stages, were dependent upon availability of Collembolan prey
Recommendation: Dipterans may be good candidates as indicators of forest management impacts on the larger arthropod community
Views: 2217
Downloads: 1
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Early stand production of hybrid poplar and white spruce in mixed and monospecific plantations in eastern Maine

Problem Addressed: Potential benefits of increasing intensity of silvicultural practices on Maine's forestlands.
Goal(s)/Objective(s): Compare early growth of pure white spruce, pure hybrid poplar, and white spruce-hybrid poplar mixed-species plantations on a typical reforestation site in eastern Maine.
Key Findings: Three years post planting, hybrid poplar height and ground line diameter growth rates began to diverge among clones; by 6 years, the Populus nigra x Populus maximowiczii clone clearly outperformed three other Populus spp. clones both in pure stands and in mixtures with white spruce. In mixture, yield of white spruce declined as yield of hybrid poplar increased.
Recommendation: Forest management in northeastern North America could benefit from increasing intensities of silviculture and establishing more plantations.
Views: 2254
Downloads: 2
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Influence of management intensity on the productivity of early successional Acadian stands in eastern Maine

Problem Addressed: Response of early successional stands to management
Goal(s)/Objective(s): Document response of early successional stands to management inputs designed to shift species composition
Key Findings: After 7 years, yields of mixedwood treatments were greater than conifer release treatments; yields of hardwood thinning treatments were similar to the untreated control, but with lower densities.
Recommendation: Early successional stands can be effectively managed during early stand development to improve growth and the longer term composition
Views: 2289
Downloads: 3
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