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

Problem Addressed: Monitoring and research of arboreal arthropods and epiphytes in gap harvests

Goal(s)/Objective(s): How epiphyte and arthropod communities are affected by height and diameter of the stem and bark texture on red maple.

Key Findings: Gap harvesting had the greatest effect on epiphytes and bark dwelling anthropods at the base of the tree.

Recommendation: Gap harvesting has the potential to maintain the arthropod and empiphyte communities in Acadian forest stands.

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Applying a Spruce Budworm Decision Support System to Maine: Projecting Spruce-Fir Volume Impacts under Alternative Management and Outbreak Scenarios

Problem Addressed: Antipated Spruce Budworm outbreak on timber supply

Goal(s)/Objective(s): Apply SBWDSS framework and use USDA FIA data to assess potential spruce-for losses from a SBW outbreak

Key Findings: Projections of moderate and severe intensity outbreaks could reduce statewide invtories by 20-30% over next 10 years.

Recommendation: Forestland owners and managers would benefit from conducting a spatially explicit township-by-township analysis of potential SBW impacts

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Effects of multiple interacting disturbances and salvage logging on forest carbon stocks

Problem Addressed: Multiple disturbances or post-disturbance forest management activities on ecosystem carbon stocks.

Goal(s)/Objective(s): Quantify how forest carbon stocks respond to stand-replacing blowdown and wildfire

Key Findings: Potential increases in multiple disturbance events may represent a challenge for sustaining ecosystem carbon stocks

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Natural disturbance in an old-growth landscape of northern Maine, USA

Problem Addressed: Forest dynamics and succession in old-growth stand in northern Maine.

Key Findings: The abundance of shade-tolerant saplings, coupled with the absence of stand-replacing disturbance, has maintained canopy dominance by shade-tolerant species.

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Refining volume estimates of down woody debris

Problem Addressed: Determine which formulae are most appropriate for use in field protocols

Goal(s)/Objective(s): Evaluate the bias, precision, and accuracy of six commonly used formulae for DWD volume estimation and to demonstrate the degree to which collapse could influence volume estimates of well-decayed DWD.

Key Findings: The conic–paraboloid formula had the lowest bias, highest precision, and greatest accuracy.

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Dendrochronological reconstruction of spruce budworm outbreaks in northern Maine, USA

Problem Addressed: Detection of major spruce budworm outbreaks in Maine

Goal(s)/Objective(s): Reconstruct the history of major spruce budworm outbreaks in northern interior Maine using host–nonhost dendrochronological analyses, contrast the outbreaks detected in this region to those of eastern Canada; and evaluate the efficacy of using radial growth patterns of small spruce trees for the purpose of detecting outbreaks.

Key Findings: Small-diameter, slow-growing red spruces clearly express the typical budworm signal once ring-width data have been properly standardized.

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Effects of thinning on drought vulnerability and climate response in north temperate forest ecosystems

Problem Addressed: Do density reductions confer greater resistance and/or resilience to droughts?

Goal(s)/Objective(s): To assess how long-term forest density management reduced drought vulnerability.

Key Findings: Thinning generally enhanced drought resistance and resilience; however, this relationship showed a pronounced reversal over time in stands maintained at lower tree densities

Recommendation: Results confirm the potential of density management to moderate drought impacts on growth

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Effects of Photoperiod and Size on Flight Activity and oviposition in the eastern spruce budworm (Lepidoptera: Torticidae)

Problem Addressed: Dispersal of adult females of eastern spruce budworm (Choristoneura fumiferana (Clem.))

Goal(s)/Objective(s): Determine effects of photoperiod on spruce budworm

Key Findings: The role of female activity as related to size and flight capability is therefore of potentially great significance in spruce budworm population dynamics and deserves further detailed investigation.

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Identifying growth releases in dendrochronological studies of forest disturbance

Problem Addressed: Measuring growth releases for reconstructing historical disturbances

Goal(s)/Objective(s): Provide an alternative method for testing growth releases

Key Findings: This absolute-increase method has convenient properties that remedy the shortcomings of the percent-increase method.

Recommendation: No arithmetic method is likely to obviate the need to visually inspect each tree-ring series.

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Effects of Insecticides on Soil Algal Population

Goal(s)/Objective(s): Present the effect of three commonly used insecticides on the algal population in a lateritic soil under two moisture levels.

Key Findings: When the three insecticides are applied at the recommended levels of field application (5 to 10 ppm), are not harmful to the soil algal population, which contribute much to the soil fertility.

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