Excess Nitrogen Pollution Disrupts Global Forest Soil Respiration
Recent research has highlighted a significant disruption in the natural rhythm of soil respiration in forests worldwide due to excess nitrogen pollution. Soil respiration, a critical process where roots and microbes release carbon dioxide as they decompose organic material, is being altered by increased nitrogen levels. This pollution stems from fertilizers, vehicle emissions, and industrial activities, which have tripled global nitrogen deposition since the Industrial Revolution. The study, involving a large dataset of nitrogen addition experiments and soil respiration observations, found that forests respond differently to nitrogen pollution. In nitrogen-limited forests, additional nitrogen initially boosts biological activity, but excessive levels eventually lead to toxicity and reduced soil respiration. Conversely, nitrogen-saturated forests experience a sharp decline in soil respiration due to ecosystem stress. 
