<p>
	Nitrogen is the most commonly limiting nutrient in forests, and nitrogen cycling is altered by acid rain and other sources of nitrogen pollution. Changes in nitrogen cycles are also one of the key ways in which climate change alters forest growth, health and composition. Working with Drs. Ivan J. Fernandez Jean MacRae, Kevin Simon, Sarah Nelson, Stephen Norton and Tsutomo Ohno (links to all researchers pages?), as an outgrowth of the 25-year study of the <a href="http://www.umaine.edu/drsoils/bbwm/bbwm.html">Bear Brook Watershed</a>, teachers and students in the northeast are helping to develop a region-wide system for understanding seasonal changes in nitrogen availability in forested watersheds.</p>
