Reassessing Potential for Exotic Larch in Northern United States.

Abstract Field measurements of operational plantations and research plots demonstrate that growth rates of exotic larches in unmanaged stands can exceed 12 m³ per hectare per year in Maine and elsewhere. This paper briefly reviews the recent history of exotic larch (Larix decidua , L. kaempferi , and L. × marschlinsii) in northeastern United States and Canada. Stands can be commercially thinned as early as 15 years; further thinnings add to significant volume accumulation, based on stand table projections. Genetic development of the hybrid (L. × marschlinsii) could yield additional volume. Even at current low stumpage values, exotic larch plantations offer positive returns at realistic discount rates. In map form, we report a current inventory of known trials and operational plantings across the Northern United States, including adjacent Canada. [ABSTRACT FROM AUTHOR]