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Does WPC affect soil redox potential in a landscape tree box?

Apr 04,2025
Abstract: Wood-Plastic Composite (WPC) is increasingly used in urban landscaping, particularly in tree boxes, due to its durability and aesthetic appeal. However, its impact on soil redox po

Wood-Plastic Composite (WPC) is increasingly used in urban landscaping, particularly in tree boxes, due to its durability and aesthetic appeal. However, its impact on soil redox potential—a critical factor for root health—remains a topic of debate.

Soil redox potential measures the availability of oxygen in the soil, which is vital for root respiration and nutrient uptake. WPC, being less permeable than natural materials, may restrict air and water exchange, potentially lowering redox potential and creating anaerobic conditions. Studies suggest that prolonged use of WPC in tree boxes can lead to reduced microbial activity and root stress, particularly in compacted urban soils.

To mitigate these effects, designers recommend integrating aeration systems or selecting WPC with perforations to enhance gas exchange. Balancing WPC's benefits with soil health considerations is key for sustainable urban forestry. Further research is needed to optimize WPC applications in green infrastructure.

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