Does polypropylene affect soil carbon sequestration in a landscape tree box?

The use of polypropylene in landscape tree boxes has raised concerns about its potential impact on soil carbon sequestration. As a common plastic material, polypropylene is durable and cost-effective, but its long-term presence in soil ecosystems may interfere with natural carbon storage processes.

Studies suggest that polypropylene can alter soil microbial activity, which plays a crucial role in breaking down organic matter and stabilizing carbon. While the plastic itself is inert, its fragmentation into microplastics over time could reduce soil porosity and water retention, indirectly affecting carbon sequestration efficiency.

However, research on this specific interaction remains limited. Some experts argue that properly contained polypropylene tree boxes may have minimal direct impact, while others highlight risks of chemical leaching or physical barriers to root growth. Sustainable alternatives, such as biodegradable materials or recycled composites, are being explored to balance functionality with environmental responsibility.

Further investigation is needed to quantify polypropylene's effects on soil carbon dynamics in urban landscaping applications. Municipalities and landscape architects must weigh durability against ecological consequences when selecting tree box materials.