Elevated CO2 and O3 alter soil nitrogen transformations beneath trembling aspen, paper birch, and sugar maple, William E. Holmes, Donald R. Zak, Kurt Pregitzer, John S. King
Michigan Tech Publications

Overstory community composition and elevated atmospheric CO < inf> 2 and O < inf> 3 modify understory biomass production and nitrogen acquisition, Janet M. Bandeff, Kurt Pregitzer, Wendy M. Loya, William E. Holmes, Donald R. Zak
Michigan Tech Publications

Microbial cycling of C and N in northern hardwood forests receiving chronic atmospheric NO < inf> 3 < sup> - deposition, Donald R. Zak, William E. Holmes, Matthew J. Tomlinson, Kurt Pregitzer, Andrew Burton
Michigan Tech Publications