How can cutting down trees affect the nitrogen cycle?

Cutting down trees disrupts the nitrogen cycle by reducing the amount of nitrogen fixed in the soil. Trees, particularly through their leaf litter and root systems, contribute to soil fertility and microbial activity that facilitate nitrogen fixation. Without trees, there is less organic matter to be decomposed, leading to decreased nitrogen availability for plants. Additionally, deforestation can result in increased nitrogen runoff into waterways, contributing to nutrient pollution and disrupting aquatic ecosystems.