SWITZERLAND — Forest trees can help contain heavy metals in polluted soils. But which tree species should be selected for this purpose? A study led by the Swiss Federal Research Institute for Forest, Snow and Landscape Research (WSL) investigated how seven different Central European tree species respond to metal-contaminated soils. All seven Central European tree species tested showed a similar ability to stabilise heavy metals in contaminated soil. Tree species with low nutrient needs keep excess metals out of their stems and foliage, making the production of uncontaminated timber possible. Selecting suitable tree species could bring abandoned land back into productive use while also safely confining the soil pollutants. …One promising solution is phytostabilisation— using plants to reduce the spread of pollutants into the environment. Trees are particularly well suited because of their long lifespans and extensive root systems.