This research examined how chemical wood preservatives used to protect lumber affect the communities of fungi living in surrounding soil over long periods. The study provides important insights into environmental impacts of wood treatment chemicals and how soil ecosystems adapt to these substances. Key impacts for everyday life include: – Helps improve understanding of environmental safety of treated wood products used in construction – Identifies beneficial fungi that could help clean up contaminated soils – Provides guidance for developing more environmentally-friendly wood preservatives – Demonstrates natural ecosystem resilience to chemical exposure – Informs best practices for disposal and handling of treated wood