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In this Wednesday episode of Talking Trees, we take a critical look at how severe pruning—especially topping—affects urban trees and their ability to provide ecosystem services. Drawing from the latest scientific research, we explore how pruning practices shape tree physiology, carbon capture, and microclimate regulation.

We discuss:

• Findings from Comin et al. (2024), showing that topping significantly reduces a tree's capacity for cooling and carbon assimilation, despite some short-term physiological responses
• Insights from Muscas et al. (2024), revealing that frequent, moderate pruning can better maintain trees’ long-term ability to sequester carbon and capture particulate matter (PM10)
• How pruning waste management plays a role in the overall carbon balance of urban forestry
• The tension between visual/aesthetic goals and functional performance in tree management
• Why evidence-based pruning strategies are essential for sustaining the ecosystem services trees provide in cities

This episode urges arborists and municipalities to rethink the long-term impact of pruning practices on urban climate and air quality.

Background information:

• Comin et al. 2024. Effects of severe pruning on the microclimate amelioration capacity and on the physiology of two urban tree species.pdf
• Muscas et al. 2024. Effects of urban tree pruning on ecosystem services performance.pdf

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