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Dynamics of Coarse Woody Debris Following Gap Harvesting in the Acadian Forest of Central Maine, U.S.A.

Problem Addressed: Dynamics of coarse woody debris (CWD) under an expanding-gap harvesting system in the Acadian forest of Maine

Goal(s)/Objective(s): Comparing volume, biomass, diameter-class, and decay-class distributions of CWD in permanent plots before and 3 years after harvest

Key Findings: The trend is likely more complex than what was determined due to the superimposition of small-scale natural disturbances and repeated silvicultural entries.

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Disturbance Dynamics of Old-Growth Picea rubens Forests of Northern Maine

Problem Addressed: How spatial and temporal aspects of past disturbances shaped the current structure and composition of old-growth Picea rubens forests

Goal(s)/Objective(s): Linking spatial data and temporal data to reconstruct the location and size of former canopy gaps back to 1920, and determine a more general disturbance as far back as 1740.

Key Findings: Persistence of Picea rubens is attributed to the abundance of advance regeneration, the ability to endure suppression and respond favorably to release, and longevity relative to ecologically similar species.

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Stand and Cohort Structures of Old-Growth Pinus Resinosa-dominated Forests of Northern Minnesota, USA

Problem Addressed: Range of variability in stand and age structure of old-growth Pinus resinosa

Goal(s)/Objective(s): Use dendrochronological data to map stem locations and reconstruct stand and age structures prior to European settlement of the region.

Key Findings: Pre-settlement forests more complex than those of the single-cohort, post-stand-replacing-fire model that has guided regional forest management.

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Residence Times and Decay Rates of Downed Woody Debris Biomass/Carbon in Eastern US Forests

Problem Addressed: Describing forest carbon dynamics and downed woody debris

Goal(s)/Objective(s): Develop models to estimate duration in various stages of decay, half-life, residence time, and decay rate for 36 tree species

Key Findings: Species that exhibited shorter half lives tended to display a shorter residence time and larger decay rate.

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Quantifying Carbon Stores and Decomposition in Dead Wood: A Review

Problem Addressed: Differences in sampling and quantification of dead wood.

Goal(s)/Objective(s): Review methods for quantifying dead wood in forest ecosystems, with an emphasis on biomass and carbon attributes.

Key Findings: Identifies key research needs and knowledge which at present impeed our ability to accurately characterize dead wood populations.

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Forest management for mitigation and adaptation to climate change: Insights from long-term silviculture experiments

Problem Addressed: Forest management strategies for addressing global climate change

Goal(s)/Objective(s): Determine long-term efficacy of mitigation and adaptation strategies

Key Findings: There are trade-offs between the achievement of mitigation and adaptation objectives

Recommendation: Rigid adherence to a single objective, without recognizing potential consequences to other ecosystem components, may be detrimental to long-term ecosystem functioning within the context of environmental change

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Net Carbon Flux of Dead Wood in Forests of the Eastern US

Problem Addressed: How to assess downed dead wood (DDW) carbon net flux

Goal(s)/Objective(s): Explore DDW carbon net flux in relation to other woody C pools and site/stand attributes

Key Findings: Diversity of ecosystem and number of organisms contribute to the complex dynamics of DDW carbon flux.

Recommendation: Assessing scale and timeframes of DDW C net flux to the atmosphere and other pools would benefit stand-level management.

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Woody Debris Volume Depletion Through Decay: Implications for Biomass and Carbon Accounting

Problem Addressed: Underestimation of decay rates

Goal(s)/Objective(s): Develop method for estimating changes in log volume through time

Key Findings: Decaying logs have a collapse ratio that can serve as a surrogate for the volume remaining

Recommendation: Accounting for log volume depletion improves biomass-loss and carbon-accounting methods

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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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