In this article published in Science of the Total Environment, Vallicrosa et al., assess the impact of nitrogen deposition in woody vegetation’s growth throughout Europe by using a European network of permanent plots ongoing since the late 80’.

The study found that nitrogen deposition’s impact on tree growth varies based on both leaf form and temperature. Conifers (needle-leaved trees) generally benefit from the additional nitrogen, using it to boost growth. In contrast, broadleaved trees often become saturated with excess nitrogen, leading to reduced growth. This difference in response highlights the complexity of nitrogen’s effects on forest ecosystems.

Geographically, the study showed that colder regions—such as northern Europe and mountainous areas—see an increase in tree growth with nitrogen deposition, primarily because these areas are more densely populated with conifer species. In contrast, tree growth in central and southern Europe tends to decline as a result of nitrogen pollution, especially in regions dominated by broadleaf trees and warmer climates.

These findings emphasize the ongoing environmental challenge posed by nitrogen deposition in Europe. Understanding its effects on forest ecosystems is essential for improving forest management practices and shaping more effective pollutant control policies. By highlighting the nuanced interactions between tree species, climate, and nitrogen pollution, the study provides a valuable framework for assessing and mitigating nitrogen’s impact on European forests.

Read the full article here.