Outdoor seating, a common feature in urban landscapes, can significantly alter the diversity and composition of the soil microbiome beneath it. The presence of benches, picnic tables, or other seating structures modifies environmental conditions such as sunlight exposure, moisture retention, and organic matter deposition, all of which influence microbial communities.

Studies suggest that shaded areas under seating often experience reduced microbial activity due to limited photosynthesis-driven nutrient inputs from plants. Compacted soil from foot traffic further restricts air and water flow, potentially decreasing aerobic microbial populations. Conversely, organic debris like food particles or leaf litter may enrich certain bacterial and fungal groups, creating localized hotspots of microbial activity.

Urban planners and ecologists are increasingly recognizing these microhabitat effects. Understanding how human-made structures interact with soil ecosystems helps design more environmentally harmonious public spaces that balance usability with ecological health. Further research could quantify these impacts across different climates and seating materials to inform sustainable urban development practices.