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Does WPC affect soil gas exchange in a landscape tree box?
Wood-Plastic Composite (WPC) is increasingly used in urban landscaping, particularly for tree boxes, due to its durability and low maintenance. However, its impact on soil gas exchange—a critical factor for tree health—remains a topic of debate.
Soil gas exchange, involving oxygen and carbon dioxide diffusion, is essential for root respiration and microbial activity. WPC's impermeability may restrict this exchange, potentially leading to oxygen depletion and elevated CO₂ levels. Studies suggest that while WPC tree boxes offer structural benefits, they may compromise soil aeration, especially in compacted urban soils.
To mitigate this, designers recommend incorporating perforations or air gaps in WPC tree boxes. Alternatively, combining WPC with porous materials like gravel or geotextiles can enhance gas exchange. Urban planners must balance WPC's advantages with tree physiological needs to ensure long-term urban forest sustainability.
Further research is needed to quantify WPC's exact impact on soil gas dynamics, but proactive design adjustments can help maintain healthy urban trees.
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