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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.

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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.

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.

Downloads: 5

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Assessing Model Performance in Forecasting Long-Term Individual Tree Diameter versus Basal Area Increment for the Primary Acadian Tree Species

Goal(s)/Objective(s): Δba and Δdbh increment equations were fit to identical datasets gathered from six conifer and four hardwood species grown in central Maine.

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Assessing and Modeling Standing Deadwood Attributes Under Alternative Silvicultural Regimes in the Acadian Forest region of Maine, USA

Problem Addressed: Standing Deadwood in Forests

Goal(s)/Objective(s): Snags in various stages of decay were inventoried across eight silvicultural treatments in eastern spruce–fir forests in central Maine nearly 60 years after treatments were initiated. Several modeling strategies were developed to estimate number of snags per hectare in various stages of decay.

Key Findings: Help with reducing disparities between observed and modeled snag stocking levels and further understanding of relationships between live and standing dead trees inherent to eastern spruce-fir forests.

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Estimates of Downed Woody Debris Decay Class Transitions for Forests Across the Eastern United States

Problem Addressed: Decay status being categorized by visual/structural attributes, not temporal transitions between DWD.

Goal(s)/Objective(s): Use a repeated DWD inventory across the eastern US to estimate decay class transitions to inform DWD dynamics across this broad geographic region

Downloads: 0

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Species Differences in Total and Vertical Distribution of Branch- and Tree-Level Leaf Area for the Five Primary Conifer Species in Maine, USA

Problem Addressed: Distribution of Leaf Area

Goal(s)/Objective(s): Examine species variation in total and vertical distribution of projected leaf area at the individual branch- and tree-levels.

Key Findings: Differences in total and vertical distribution of leaf area exist between species, but significant amounts of their variation are largely accounted for by bole and crown size.

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Long-Term Effects of Precommercial Thinning on the Stem Dimensions, Form and Branch Characteristics of Red Spruce and Balsam Fir Crop Trees in Maine, USA

Problem Addressed: Precommercial Thinning

Goal(s)/Objective(s): Assessing crop trees 25 years after treatment in an even-aged northern conifer stand.

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Effect of gap harvesting on epiphytes and bark-dwelling arthropods in the Acadian forest of central Maine

Problem Addressed: Epiphyte and Arthropod Communities

Goal(s)/Objective(s): To determine effects on epiphyte and anthropod communities from red maple trees

Key Findings: Arthropod and epiphyte assemblages dwelling on the bark of red maple trees located in undisturbed forest and harvest gaps varied with height.Canonical correlation analysis revealed a positive association between bryophytes, Collembola, and Araneae. A strong correlation between Collembola and Araneae suggested a possible trophic interaction that may be affected by gap harvesting through a reduction in bryophyte abundance.

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Maine public estate and conservation lands

Problem Addressed: History of public and conservation lands in Maine, and comparisons to other states

Goal(s)/Objective(s): Assemble data describing these lands to make them more widely available.

Key Findings: Maine came very late to creating a Public Estate; private initiative was critical.

Recommendation: Use more easements; round out units in North, emphasize needs in Southern Maine

Downloads: 3

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