pollutant-dynamics
Pollutant dynamics refers to the study of how airborne, soil-based, and waterborne contaminants move through, accumulate in, and are processed by plant tissues over time. This field matters for plant science because forest species often serve as biological indicators of environmental contamination, revealing how pollutants affect growth, physiology, and long-term survival. Understanding these interactions also helps researchers assess forest ecosystem health and resilience in the face of industrial and atmospheric pollution.
open_in_new WikipediaPubMed · 2026-07-10
A 20-year nitrogen-addition experiment in Canadian forests found that soil chemistry and horizon type, not added nitrogen, control how much toxic PAH pollution accumulates in forest soils. Organic layers near the surface hold far more PAHs than deeper mineral layers, and the type of forest stand shapes which soil properties matter most.
Long-term nitrogen addition (>20 years, 3 dose levels) had no statistically robust effect on PAH concentration or vertical distribution across any forest stand or soil horizon tested.
Organic horizons (F and H layers) consistently retained higher PAH concentrations than mineral horizons, with the magnitude of difference varying by forest type (sugar maple, balsam fir, black spruce).
Nitrogen-related soil metrics, organic carbon content, and pH were the strongest forest-specific predictors of PAH retention, confirming natural edaphic factors as dominant controls.
