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Zhang Y. Characterizing land changes over several points in time.  2011.\par \par Zhang Y, Mitchell MJ, Driscoll CT, Likens GE. Changes in soil sulfur constituents in a forested watershed 8 years after whole-tree harvesting.  1999;29:356-364.\par \par Zhang Y, Mitchell MJ, Christ M, Krouse HR, Likens GE. Stable sulfur isotopic biogeochemistry at Hubbard Brook Experimental Forest, New Hampshire.  1998;41:259-275.\par \par Mitchell MJ, Krouse HR, Mayer B, Stam AC, Zhang Y. Use of stable isotopes in evaluating sulfur biogeochemistry of forest ecosystems. In: McDonnell JJ Isotope Tracers in Catchment Hydrology. Isotope Tracers in Catchment Hydrology. New York; 1998. p. 490-518.\par \par Christ M, Zhang Y, Likens GE, Driscoll CT. Nitrogen retention capacity of a northern hardwood forest soil under ammonium sulfate additions.  1995;5(3):802-812.\par \par Christ M, Zhang Y, Driscoll CT, Likens GE. Nitrogen immobilization capacity of a northern hardwood forest soil.  1991;72(2):88.\par \par Pardo LH, Driscoll CT, Siccama TG, Zhang Y. Trends in wood tissue nitrogen concentration in a northern hardwood ecosystem.  1990;71(2):277-278.\par \par }