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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.

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Arboreal arthropod associations with epiphytes following gap harvesting in the Acadian forest of Maine

Problem Addressed: Sensitivity of Collembola, Araneae, and Diptera to forest management.

Goal(s)/Objective(s): Further examination of gap harvesting on Collembola and their associations with epiphytes and arthropods.

Key Findings: The correlation among bryophytes, Collembola (springtails) and Araneae (spiders) suggest a potential trophic interaction where arboreal spiders, during early developmental stages, were dependent upon availability of Collembolan prey

Recommendation: Dipterans may be good candidates as indicators of forest management impacts on the larger arthropod community

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Early stand production of hybrid poplar and white spruce in mixed and monospecific plantations in eastern Maine

Problem Addressed: Potential benefits of increasing intensity of silvicultural practices on Maine's forestlands.

Goal(s)/Objective(s): Compare early growth of pure white spruce, pure hybrid poplar, and white spruce-hybrid poplar mixed-species plantations on a typical reforestation site in eastern Maine.

Key Findings: Three years post planting, hybrid poplar height and ground line diameter growth rates began to diverge among clones; by 6 years, the Populus nigra x Populus maximowiczii clone clearly outperformed three other Populus spp. clones both in pure stands and in mixtures with white spruce. In mixture, yield of white spruce declined as yield of hybrid poplar increased.

Recommendation: Forest management in northeastern North America could benefit from increasing intensities of silviculture and establishing more plantations.

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Influence of management intensity on the productivity of early successional Acadian stands in eastern Maine

Problem Addressed: Response of early successional stands to management

Goal(s)/Objective(s): Document response of early successional stands to management inputs designed to shift species composition

Key Findings: After 7 years, yields of mixedwood treatments were greater than conifer release treatments; yields of hardwood thinning treatments were similar to the untreated control, but with lower densities.

Recommendation: Early successional stands can be effectively managed during early stand development to improve growth and the longer term composition

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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Is Early Life Cycle Success a Determinant of the Abundance of Red Spruce and Balsam Fir?

Problem Addressed: Regeneration success during changing climates of the Holocene and after harvest

Goal(s)/Objective(s): To determine if early life stage behavior contributes to differences with changing climates and harvest

Key Findings: Seed germination by red spruce was equally fast and complete in warm and cool temperature regimes, while balsam fir germination was slower and less complete in both, especially in the cool regime

Downloads: 3

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Changes in landscape composition and stand structure from 1945–2002 on an industrial forest in New Brunswick, Canada

Problem Addressed: Changes in species composition, age-class distribution, stand structure

Goal(s)/Objective(s): Compare aspects of NB forest between 1945 and 2002

Key Findings: Forest management from 1945 to 2002 resulted in the forest (1) becoming younger, (2) becoming denser, and (3) having less balsam fir

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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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Effects of intensive forest management on stand and landscape characteristics in northern New Brunswick, Canada (1945–2027)

Problem Addressed: Landscape patterns and changes caused by harvesting and silviculture

Goal(s)/Objective(s): Evaluation of historical and future changes in species composition, age classes, and patch characteristics between 1945, 2002, and projections to 2027

Key Findings: Strong cumulative effect of forest management on landscape patterns, especially the socially mandated drive for smaller clearcuts resulting in the loss of large patches

Downloads: 3

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