Does WPC affect earthworm activity in a landscape tree box?

Wood-Plastic Composite (WPC) is increasingly used in urban landscaping, including tree boxes, due to its durability and low maintenance. However, its impact on soil-dwelling organisms like earthworms remains a topic of interest. Earthworms play a vital role in soil aeration, nutrient cycling, and overall ecosystem health.

Recent studies suggest that WPC may alter soil conditions, such as temperature and moisture retention, which could indirectly affect earthworm activity. While WPC is inert and non-toxic, its impermeability might reduce organic matter decomposition rates, a key food source for earthworms. Additionally, the lack of natural biodegradability in WPC could limit habitat suitability for these beneficial invertebrates.

Field observations in urban settings show mixed results. Some tree boxes with WPC linings exhibit reduced earthworm populations, while others show no significant change. Factors like soil composition, nearby vegetation, and maintenance practices likely influence these outcomes.

For sustainable urban landscaping, balancing WPC's practical benefits with ecological considerations is crucial. Further research is needed to optimize designs that support both infrastructure longevity and soil biodiversity.

By understanding these dynamics, urban planners can make informed choices to foster healthier urban ecosystems.