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Two unpublished papers on forest practices regulation

Problem Addressed: Challenges in devising effective forest practice regulations

Goal(s)/Objective(s): Outline the issues in stream corridors and other forest regulations; provide extensive lit. cites.

Key Findings: Papers are old, but the issues persist. Much to learn.

Recommendation: Must get serious about practical research to design better rules

Downloads: 0

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Estimating timberland parcel value in the northeast United States using acreage and commercial timber value

Problem Addressed: Evaluating market value of timberland can be difficult because of the various factors that influence it

Goal(s)/Objective(s): Assess the relationship between the sale price, commercial timber value (CTV), acreage, and other factors

Key Findings: A strong relationship between sale price, CTV, and acreage was found (R2 = 0.71) with limited variation attributable to year or state

Recommendation: Developed equation may be useful for evaluating future land transactions and establishing baselines in the region

Downloads: 7

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Influence of partial harvesting and site factors on the abundance and composition of natural regeneration in the Acadian Forest of Maine, USA

Problem Addressed: Understanding the factors regulating the composition and abundance of natural regeneration in Acadian forest ecosystems.

Goal(s)/Objective(s): Importance of silvicultural treatment and site factors in structuring the species composition and abundance of natural regeneration.

Key Findings: Overstory and understory vegetation exhibit greater control over regeneration patterns than substrate and soil attributes, or silvicultural treatment, in partially harvested mixedwood stands.

Downloads: 3

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Long-term compositional dynamics of Acadian mixedwood stands under different silvicultural regimes

Problem Addressed: Forest response to natural disturbances and silvicultural treatments over time

Goal(s)/Objective(s): Tree species composition versus initial composition and harvest disturbance history after 5 decades of silvicultural treatments

Key Findings: Higher harvest intensity increases dominance by early successional species; lighter harvests maintain dominance by late successional species

Recommendation: Sustaining cedar recruitment may require additional silvicultural treatments

Downloads: 4

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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

Downloads: 2

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Developing optimal commercial thinning prescriptions: A new graphical approach

Problem Addressed: Thinning prescriptions for intensive management of stand density

Goal(s)/Objective(s): Develop an analytical framework to facilitate the application of existing stocking diagrams and stand-growth simulators in formulating density-management regimes

Key Findings: Graphical techniques such as ThinME allow forest managers to effectively explore a variety of commercial thinning prescriptions.

Downloads: 6

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Height-diameter models with random coefficients and site variables for tree species of central Maine

Problem Addressed: Growth and yield measurements

Goal(s)/Objective(s): Compare height-diameter models for New England tree species using both GNLS and mixed-effects modeling approaches

Key Findings: Mixed-effects approaches were superior to GNLS

Recommendation: Differences in stand structure had a significant influence on the height-diameter relationships

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

Downloads: 4

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Comparison of model forms for estimating stem taper and volume in the primary conifer species of the North American Acadian Region

Problem Addressed: Develop stem taper equations for balsam fir, red spruce, and white pine in the Acadian Region

Goal(s)/Objective(s): Use mixed-effects to assess the amount of within- and between-tree variation in stem profiles; evaluate ten stem taper profile models; and assess the level of improvement.

Key Findings: Selecting the best regional taper equation is difficult as it depends on species, dataset, and intended use.

Recommendation: Use of the geometric mean of all predictions is suggested when multiple equations for a certain species exist.

Downloads: 0

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Regional Stem Taper Equations for Eleven Conifer Species in the Acadian Region of North America: Development and Assessment

Problem Addressed: Taper profile models for conifer species in the Acadian Forest Region.

Goal(s)/Objective(s): Practical guidelines for developing taper profile models for the majority of conifer species in the Acadian Forest Region.

Key Findings: Fitted taper equations can accurately predict both stem form and volume across a range of conditions.

Downloads: 2

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