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Measuring the Effects of Freezing Injury on Red Spruce (Picea rubens Sarg.) Needles

Problem Addressed: Freezing foliage leading to a decline of Red spruce in northeastern North America
Goal(s)/Objective(s): The effect of thawing rate on freezing injury, relation of mass exchange and chlorophyll loss to electrolyte leakage, and Rhizosphaera kalkhoffii Bubák interacts with freeze-injured needles.
Key Findings: Photosynthesis most sensitive measure, Faster thaw rates increase damage.
Views: 1022
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An Alternative Model of Beech Bark Disease

Problem Addressed: Lack of evidence supporting beech bark disease model proposed in 1934
Goal(s)/Objective(s): Develop a new model of BBD highlighting biotic and abiotic factors
Views: 1204
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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.
Views: 907
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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.
Views: 1057
Downloads: 1
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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.
Views: 810
Downloads: 0
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