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The upper Neversink River basin in the Catskill Mountains of New York contains about 92 square miles of sparsely settled, mostly forested land (fig. 1). The river drains into the Neversink Reservoir, one of six that supply drinking water to New York City from the Catskill Mountain region. The terrain is steep and contains some of the highest mountains in the Catskill region. The U.S. Geological Survey, in cooperation with the New York City Department of Environmental Protection, is studying the effects of forest harvesting on nitrogen-cycling processes in the Neversink watershed because of the potential effects on stream water quality. The Catskill Mountain region has among the highest rates of atmospheric nitrogen deposition in the northeastern United States (Ollinger and others, 1993). This nitrogen falls in rain and snow as a dilute solution of nitric acid. As runoff moves down the steep slopes and through the thin soils, the acidity is only partly neutralized, and the accompanying nitrogen is readily transported as nitrate to streams. Long-term data (Murdoch and Stoddard, 1992) show that nitrate concentrations in Catskill streams have increased during the past 50 years (fig. 2), and that Catskill forests may be approaching a condition known

Effects of forest harvesting on nitrogen-cycling processes in headwaters of the Neversink River, New York