Title: Earthworms, compaction, and soil biochemical properties of structural soil

Summary: Structural soils are commonly used substrates for trees in highly urbanized environments. We are beginning to understand the physical properties of these artificial mediums; but, our understanding of their chemical and biological properties is inadequate. Earthworms are keystone organisms that increase soil macroporosity, decrease density, and stimulate microbial activity and biomass. A microcosm experiment was conducted to test the impacts of Lumbricus terrestris on physical, chemical, and biological properties of compacted and non-compacted structural soil. Our results indicate that earthworms can survive in compacted structural soil and significantly alter soil physical, chemical, and biological properties.

Bryant C. Scharenbroch, PhD, Teaching Assistant, The Morton Arboretum, Research, Lisle, IL, United States

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