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Stand Structure and Composition 32 Years after Precommercial Thinning Treatments in a Mixed Northern Conifer Stand in Central Maine

Problem Addressed: Precommercial thinning on an even-aged northern conifer stand in Maine

Goal(s)/Objective(s): Examination of stand structure and composition 32 years after treatment.

Key Findings: Early thinning treatments were found to have long-term effects on key stand attributes, even more than 30 years after treatment in areas with mixed species composition and moderate site potential.

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Larch plantings at Viles Arboretum

Problem Addressed: Larch stand volume

Key Findings: Hybrid larch outperformed other exotic larches and tamarack.

Downloads: 4

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Larch plantings at Viles Arboretum

Problem Addressed: Larch stand volume

Key Findings: Hybrid larch outperformed other exotic larches and tamarack.

Downloads: 2

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MODELING BIOMASS AND NUTRIENT DYNAMICS IN MAINE BALSAM FIR STANDS: INFLUENCE OF INCREASED SILVICULTURAL INTENSITY ON FOREST SUSTAINABILITY

Problem Addressed: Intensive forest harvesting impacts on site productivity.

Key Findings: This analysis indicated that relative risk of depletion of plant-available nutrients was Ca>K>P>Mg. If N remains the most commonly deficient nutrient in forests of the region today, then accelerated rates of N removal were also a potential concern.

Recommendation: Evaluate site conditions and soil suitability as part of intensive harvesting prescriptions.

Downloads: 6

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Northern tamarack: unused resource?

Problem Addressed: Describes extent of tamarack in North, and potential market options

Goal(s)/Objective(s): Assess area and volume of tamarack and describe markets

Key Findings: Resource is not large but generally underutilized; tamarack area once much larger

Recommendation: Tamarack suited to uses in the round, small mills, small logging operations

Downloads: 0

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Spruce budworm returns to Northeast

Problem Addressed: Current status of Spruce fir forests in NY, VT, NH, and ME

Goal(s)/Objective(s): DEscribe extent and condition of region's spruce fir forests and timber supply

Key Findings: Most of the spruce fir area is in Maine; an large surplus is in the 21-40 yr age class

Recommendation: Land managers need to prepare in advance for possible budworm outbreak

Downloads: 3

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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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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.

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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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