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Long-term spatial and structural dynamics in Acadian mixedwood stands managed under various silvicultural systems

Problem Addressed: Differences in spatial pattern, species mingling, height differentiation, and relative stand complexity index (rSCI).
Goal(s)/Objective(s): To determine differences in spatial pattern, species mingling, height differentiation, and relative stand complexity index (rSCI) due to five treatments: commercial clear-cutting, fixed diameter-limit, 5 year single-tree selection, three-stage shelterwood (both with and without precommercial thinning), and unharvested natural areas.
Key Findings: Precommercial thinning in a shelterwood treated stand generally increased species mingling, height differentiation, and rSCI. Two untreated natural areas exhibited divergent pathways of structural development. Dynamics in uneven-aged selection treatments more closely resembled that of the untreated natural areas than did the shelterwood, commercial clearcut, or fixed diameter-limit treatments.
Views: 1856
Downloads: 1
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Nutrient Concentration of Down Woody Debris in Mixedwood Forests in Central Maine, USA

Problem Addressed: Nutrient concentrations pre- and post-harvest pool sizes across down woody debris decay.
Goal(s)/Objective(s): To determine the nutrient concentrations
Key Findings: Softwoods generally had lower nutrient concentrations and higher C:N-ratios than hardwoods; N:P-ratios did not differ between hardwoods and softwoods.
Views: 1910
Downloads: 3
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Influence of harvest gaps and coarse woody material on click beetles (Coleoptera: Elateridae) in Maine’s Acadian forest

Goal(s)/Objective(s): To examine how the species richness, abundance, diversity, and assemblage of similarity of click beetles inhabiting coarse woody material were affected by harvesting and coarse woody material characteristics.
Key Findings: Small (less than 0.2 ha) harvest gaps with living trees retained throughout the gap can maintain click beetle assemblages similar to that of an unharvested forest.
Views: 1924
Downloads: 0
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The role of herbicides for enhancing forest productivity and conserving land for biodiversity in North America

Problem Addressed: Do herbicides increase forest productivity, and are they compatible with the objectives of wildlife management and biodiversity conservations?
Key Findings: If herbicides are properly used, current research indicates that the negative effects on wildlife are usually short-term and that herbicides can be used to meet wildlife habitat objectives.
Views: 1963
Downloads: 5
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Benchmarking and Calibration of Forest Vegetation Simulator Individual Tree Attribute Predictions Across the Northeastern United States

Goal(s)/Objective(s): Benchmark and calibrate three submodels of the Forest Vegetation Simulator-Northeast variant (FVS-NE).
Key Findings: An assessment of overall model performance should be conducted if calibrated submodels are used and alternative modeling strategies be explored to better represent the allometry and growth of the important trees species across the northeastern United States.
Views: 2501
Downloads: 2
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Comparing Strategies for Modeling Individual-Tree Height and Height-to-Crown Base Increment in Mixed-Species Acadian Forests of Northeastern North America

Problem Addressed: Lack of prediction methods for annual tree height increment and height-to-crown base increment.
Key Findings: There is an advantage to incorporating species as a random effect in individual-tree models and the effectiveness of modeling tree crown recession directly for application in mixed-species forest growth and yield models was demonstrated.
Views: 2060
Downloads: 0
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Irland relics on Budworm

Problem Addressed: Various aspects of the spruce budworm challenge to Maine's forests
Goal(s)/Objective(s): This is a reading list of obscure items for anyone interested. Few are on Web.
Key Findings: Various summaries of the last budworm outbreak and lessons learned.
Views: 2234
Downloads: 9
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Brown needles Lessons from SBW Outbreak of 70’s and 80’s

Problem Addressed: Lessons learned.
Goal(s)/Objective(s): Informal summary on issues.
Key Findings: Forest, industry, and pest control options have all changed. WE have one well observed outbreak but next one may be different.
Recommendation: Continue the march already begun by State with intense early monitoring, and industry and University with planning, education, and information.
Views: 2140
Downloads: 5
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