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Modeling annualized occurrence, frequency, and composition of ingrowth using mixed-effects zeroinflated models and permanent plots in the Acadian Forest Region of North America

Problem Addressed: Modeling tree ingrowth utilizing random effects

Goal(s)/Objective(s): Find the best modeling approach for annualized ingrowth count data for mixed species and mixed cohort stands in the Acadian Forest Region.

Key Findings: Combining mixed effects modeling techniques with zero-inflated distributions resulted in significant improvement in modeling.

Recommendation: Results can be incorporated into any forest growth simulator for the Acadian Forest Region.

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Estimating and predicting bark thickness for seven conifer species in the Acadian Region of North America using a mixed-effects modeling approach: Comparison of model forms and subsampling strategies

Problem Addressed: Knowledge of bark thickness and the ability to predict it accurately

Goal(s)/Objective(s): Cevelop bark thickness prediction models for the major conifer species in the Acadian Region of North America

Key Findings: Cao and Pepper's (1986) equation performed significantly better than other equations for most of our study species

Recommendation: No unified prior measurement can provide best predictive abilities across all species

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Long-term response of spruce–fir stands to herbicide and precommercial thinning: observed and projected growth, yield, and financial returns in central Maine, USA

Problem Addressed: Long-term growth and yield responses from controlled experiments that include both herbicide application and precommercial thinning.

Goal(s)/Objective(s): Use 40-year growth and yield responses of spruce–fir stands to combinations of early herbicide and PCT to calibrate the Forest Vegetation Simulator (Northeast Variant).

Key Findings: Highest stumpage values resulted from combined herbicide and PCT treatments, followed by PCT-only and then herbicide-only.

Recommendation: Good financial returns are possible over the long-term from early investments in herbicide and PCT treatments in Maine spruce–fir stands.

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Assessing the Feasibility of Low-Density LiDAR for Stand Inventory Attribute Predictions in Complex and Managed Forests of Northern Maine, USA

Problem Addressed: Applicability of using a low-density discrete-return LiDAR for forest management.

Goal(s)/Objective(s): Evaluate LiDAR for predicting maximum tree height, stem density, basal area, quadratic mean diameter, and total volume.

Key Findings: Low density LiDAR was able to capture variability but tended to underestimate maximum tree height and volume; accuracy of volume prediction was sensitive to the plot type.

Recommendation: Use of LiDAR-based inventory attribute predictions is a valuable option for achieving efficient and effective forest assessment.

Downloads: 3

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Development and evaluation of aboveground small tree biomass models for naturally regenerated and planted species in eastern Maine, U.S.A.

Problem Addressed: Models for small tree biomass estimates in northeastern North America

Goal(s)/Objective(s): Evaluate additive aboveground component and biomass models for five naturally regenerated hardwood species.

Key Findings: Small tree biomass models currently used to predict woody biomass substantially underestimated biomass at the study site.

Recommendation: Current FAS models may be inadequate for providing reliable sapling biomass estimates in Maine, and new techniques should be developed.

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Efficiency of alternative forest inventory methods in partially harvested stands

Problem Addressed: Which inventory methods are best given the distinct spatial and structural heterogeneity in Maine forestlands.

Goal(s)/Objective(s): Compare horizontal point, fixed area, and horizontal line measurement methods in partially harvested stands across northern and central Maine.

Key Findings: Horizontal line sampling proved to be a viable method in post-partial harvest stand conditions.

Recommendation: There are trade-offs between precision and time costs involved in measurement methods under a range of heterogeneous stand conditions.

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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 down coarse woody debris under an expanding-gap harvesting system

Goal(s)/Objective(s): To compare volume, biomass, diameter-class, and decay-class distributions of CWD in permanent plots before and 3 years after harvest and to determine wood density and moisture content by species and decay class

Key Findings: Both harvesting treatments increased the volume and biomass of non-decayed, small-diameter CWD although the trend is likely more complex because of the superimposition of small-scale natural disturbances and repeated silvicultural entries

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Logging Residue Volumes and Characteristics following Integrated Roundwood and Energy-Wood Whole-Tree Harvesting in Central Maine

Problem Addressed: Integrated roundwood and energy-wood whole-tree partial harvesting, biomass, coarse woody material, fine woody material

Goal(s)/Objective(s): Gain information on volume and characteristics of logging residues left behind on harvest sites

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The use of composite estimators for estimating forest biomass and growth from permanent sample plots established by the angle count method

Problem Addressed: Using angle count sampling for permanent plots can create issues when computing growth

Goal(s)/Objective(s): Provide a new estimator for determining growth on remeasured plots using an angle gauge

Key Findings: The Bitterlich estimator is a special case of a composite estimate between the new variable basal area factor and its antithetic counterpart

Recommendation: Additivity and efficiency are possible when permanent sample plots are established with a point sampling design

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Maximum and Largest Crown Width Equations for 15 Tree Species in Maine

Problem Addressed: Crown width is an important tree attribute, but challenging and expensive to measure.

Goal(s)/Objective(s): Develop equations to predict maximum and largest crown width as a function of DBH

Key Findings: Large differences between species crown widths and a strong relationship with DBH

Recommendation: Crown width equations are useful tool and can be used to derive a variety of forest attributes like crown closure.

Downloads: 2

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Forest Models/Measurements Documents

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