Nitrogen Saturation in Temperate Forest Ecosystems

itrogen emissions to the atmosphere due to human activity remain elevated in industrialized regions of the world and are accelerating in many developing regions (Galloway 1995). Although the deposition of sulfur has been reduced aver much of the Uni ted Stares and Europe by aggressive environmental protection policies, CUfrent nitrogen deposition reduction targets in the US are modest. Nitrogen deposition rernains relatively canstant in the northeastern United Stares and is increasing in the Southeast and the West (Fenn er a1. in press).