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Overstory Canopy Influences on Height Development of Red Spruce and Balsam Fir Saplings

Problem Addressed: Effects of overstory canopy structure on height development of red spruce and balsam fir saplings is critical for managing multi-cohort forests in Maine.

Goal(s)/Objective(s): Use predictive models to develop and examine the relationships between gap fraction and pine overstory basal area, crown projection area, and projected leaf area, and height increment of open-grown and understory red spruce and balsam fir sapling and gap fraction.

Key Findings: On fair sites, spruce and fir height growth can be maximized if grown beneath approximately 65 percent gap fraction, which is equivalent to a pine leaf area index of 1.0 (m2/ha/ha), or a basal area of 10 (m2/ha). In addition, spruce and fir saplings growing beneath 30 percent gap fraction, a pine leaf area index of 2.0 (m2/ha/ha), or a basal area of 25 (m2/ha), will not suffer in decreased height growth compared with open-grown trees.

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Evaluation of a GIS Rule-Based Model to Map Forested Wetlands in Maine

Problem Addressed: Forested wetlands in Maine.

Goal(s)/Objective(s): Analyze, revise, and test a Geographic Information System (GIS) rule-based model to improve the mapping of forested wetlands in Maine.

Key Findings: Evaluation of new variables in the model (e.g. topographic position) and the effect of spatial error propagation in developing the GIS data base need to be investigated further.

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Simulating Volatile Preservative Movement in Spruce Poles

Problem Addressed: Pressure treatment of transmission poles.

Goal(s)/Objective(s): Develop a mathematical model to simulate the movement of fumigants in spruce poles in service. The model is designed to be used in planning for proper re-treatment schedules and for comparing different fumigant formulations and application methods.

Key Findings: Diffusion coefficients and effective transfer coefficients of two commonly used fumigants, methyl isothiocyanate and chloropicrin, in red spruce wood were measured.

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Genetic Variance of Height Growth and Cone Production in Progeny of Black Spruce (Picea mariana (Mill.) B.S.P.) in Maine

Problem Addressed: Black Spruce variance

Goal(s)/Objective(s): Identify the families and individuals having the best height growth at age 13 and estimate the heritability of the trait, to determine whether the genotype-environment interaction is significant, to determine if there are significant differences in height between progeny of fast-growing parent trees and progeny of slower-growing parent trees, or among different stands, to determine whether selection is effective at early ages, to determine if family differences affect cone production and to estimate heritability for this trait, and to determine if family differences affect seed viability.

Key Findings: These 13-year-old black spruce progeny tests provide valuable information useful in determining proper strategies for growth improvement for the next generation of this species.

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Relationships among Prey Abundance, Habitat, and American Marten in Northern Maine

Problem Addressed: American marten

Goal(s)/Objective(s): Examine marten food habits and habitat features associated with small mammal captures to evaluate the hypothesis that marten select habitat in response to differences in macro- and micro- habitat selection by their principal prey.

Key Findings: Small animals did not seem to select habitat based on coarse woody debris, perhaps because dead woody material was sufficient in all of the stand types.

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Map of Spruce Budworm Distribution 1945

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The Site and Age Effects on the Selected Physical and Mechanical Properties of Red Maple in Maine

Problem Addressed: Red Maple in Maine

Goal(s)/Objective(s): Assess soil drainage class, individual tree, and position within tree effects on physical and mechanical properties, and to examine the relationships of specific gravity, MOR and MOE to age and how the relationships were affected by soil drainage class, individual tree and position within tree.

Key Findings: Age, site, tree, position, the site and position interaction, and the position and tree interaction significantly affect specific gravity, MOE and MOR in the juvenile zone.

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