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Trust hears preliminary findings of 2024 forest health assessment for Mercer Island open spaces
Summary
A consultant‑led forest health assessment found wide spatial variability in tree density, coarse woody debris and understory invasive cover across trust properties; staff said the data will be used to establish baselines, guide planting and target future thinning or maintenance.
Natural Resources Program Manager Lizzie Stone presented preliminary results of the city’s 2024 forest health assessment at the Open Space Conservancy Trust meeting on April 29, noting the study will inform baseline metrics for the city’s climate action plan and future management decisions.
Stone said the city worked with Haven Ecology and Research to survey overstory and understory plots across trust properties. She told the trust the 2024 survey used macro (10×40 m) and micro (10×10 m and 5×5 m) plots that measured basal area, tree density, seedlings and saplings, ivy on trees, coarse woody debris volume and…
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