Long-term stabilization of N-labeled experimental NH deposition in a temperate forest under high N deposition.

High nitrogen (N) deposition levels, currently present in many industrial and agricultural regions of the world, can strongly affect the functioning of forest ecosystems. In a pine forest with strong N leaching, located in the Netherlands, we studied the long-term fate of a year-long NH deposition cohort labeled with N. A high ambient and a low N deposition treatment had been established at the site by means of a roof and sprinklers.