Field Observations from Reforesting a Typha-Dominated Conifer Swamp in Southwest Michigan
Wetlands dominated by conifer trees are valued for wildlife, carbon sequestration, and commercial lumber production. Managers face unique challenges when reforesting these sites given the seasonally wet soils and variable hydrology. Black ash (Fraxinus nigra Marshall) is typically a component of these wetlands in the Lake States of the Eastern United States, but the species is disappearing due to the emerald ash borer (Agrilus planipennis Fairmaire, 1888). The loss of this species, competition from invasive plants such as cattail (Typha spp.), and climate change affect the delicate hydrology and subsequent tree regeneration in these sites. This article describes an observational study to assess success of planting native and nonnative tree species in a wetland area over 10 years. Northern white cedar (Thuja occidentalis L.) had the highest growth rate followed by eastern white pine (Pinus strobus L.). Growth of nonnative Atlantic white cedar (Chamaecyparis thyoides [L.] Britton, Sterns & Poggenb.) was higher than expected. Growth varied by species and tended to be influenced by duration of high water levels (especially during summer months). Canopy closure is expected to shade out competing vegetation an estimated 20 years after the time of planting.
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Author(s): Alex Mehne, Charles Mehne
Publication: Tree Planters' Notes - Volume 66, Number 1 (2023)
Volume: 66
Number: 1
