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Does polypropylene affect soil aggregate stability in a landscape tree box?
The use of polypropylene in urban landscaping, particularly in tree boxes, has raised concerns about its long-term effects on soil health. Research suggests that polypropylene fibers, often used for erosion control or root protection, may alter soil aggregate stability—a critical factor for water infiltration, root growth, and nutrient cycling.
Studies indicate that while polypropylene initially stabilizes soil by binding particles, prolonged exposure can lead to fragmentation into microplastics. These particles may disrupt microbial activity and reduce the formation of stable soil aggregates, especially in confined systems like tree boxes. However, results vary based on soil type, climate, and polypropylene concentration.
For urban planners, balancing practicality with ecological impact is key. Alternatives like biodegradable jute or coconut coir may offer similar benefits without compromising soil structure. Further field studies are needed to quantify polypropylene's long-term role in urban soil ecosystems.
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