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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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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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Improving Tree Age Estimates Derived from Increment Cores: A Case Study of Red Pine

Problem Addressed: Magnitude of errors using ring counts for accurate tree age

Goal(s)/Objective(s): Improving estimates of tree establishment dates

Recommendation: Use of regression equations clearly improved age estimates

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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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LiDAR and Forestry: Opportunities, Challenges, and Future

Problem Addressed: LiDAR and structure for motion provide invaluable data on forests

Goal(s)/Objective(s): Describe potential uses and challenges of these 3D technologies

Key Findings: 3D will change how we inventory and make forest management decisions

Recommendation: Continued research and evaluation of 3D products is needed for full utilization

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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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LiDAR and Forestry: Opportunities, Challenges, and Future Directions

Problem Addressed: Discuss some of the opportunities of using LiDAR for forestry

Goal(s)/Objective(s): Explain what LiDAR is and why it is useful

Key Findings: LiDAR is a powerful technology but has some important limitations that should be reocgnized

Recommendation: Continued acquisition of LiDAR and research will be needed to see full utilization of this technology

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Effects of competition on tree characteristics and wood quality of sugar maple

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Forest Models/Measurements Documents

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