Forest soils accumulate microplastics through atmospheric deposition

A recent study from Germany’s Technical University Darmstadt, and published on Commun Earth Environ, has revealed that forest soils act as major sinks for microplastic pollution. Researchers found that tiny plastic particles are carried through the air, deposited onto forest canopies, and then washed down to the forest floor by rainfall and falling leaves. Over time, this process leads to microplastic buildup in both the organic and mineral layers of the soil.

The findings suggest that forests could serve as valuable indicators of the scale of airborne microplastic pollution. Unlike agricultural systems, where pollution often comes from direct sources, contamination in forests is largely diffuse and atmospheric. This raises concerns about the long-term impacts on soil health and the resilience of forest ecosystems, which are already under pressure from climate change.

The study calls for more research into how this hidden form of pollution might affect the functioning and sustainability of these critical ecosystems.