Document Type

Article

Publication Title

Maine Woodlands

Publisher

Maine Woodland Owners

Publication Date

Winter 12-2025

Publisher location

Augusta, Maine

Issue Number

12

Volume Number

50

Abstract/ Summary

The origin, components, and implementation challenges of the Triad, a forest landscape zoning concept developed to balance forest production with biodiversity conservation, are described. This concept emerged from a momentous paradigm shift in American forestry about 1990, moving from an almost exclusive focus on wood production to recognizing the critical need for a more holistic, ecosystem-based approach, then termed "New Forestry." The Triad was formally introduced in 1992 via the University of Maine Experiment Station Bulletin MP 716.

The framework proposes a balanced design where three distinct land management strategies coexist to both conserve native biodiversity and sustain forest-based economies. The three legs of the Triad are: 1) Ecological Reserves, which are unmanaged areas retained in their natural state to serve as reservoirs of biological diversity and monitoring benchmarks; 2) High-Yield Production Forestry, involving intensive practices like plantation silviculture, intended to replace wood volumes lost due to the designation of reserves; and 3) the Ecological Matrix Forest, which dominates the landscape and is managed under ecological forestry principles.

Although the concept faced opposition from those adhering to a "manage everywhere" mentality, it has since gained widespread global acceptance, influencing management across millions of hectares. Implementation in Maine led to the enactment of a reserve system on Public Lands, stipulating that timber harvest on managed lands must not decline—an example of obvious Triad logic. More recently, Nova Scotia officially embraced the Triad in 2019, dedicating over half its crown forest to the matrix. Achieving high-level ecological silviculture in the matrix forest, for which Nova Scotia developed a detailed 193-page guide, has proven to be the greatest long-term challenge.

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