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Zak DR, Pregitzer KS, Curtis PS, Holmes WE.  2000.  Atmospheric CO2 and the composition and function of soil microbial communities. Ecological Applications. 10(1):47-59.
Zak DR, Pregitzer KS, Curtis PS, Vogel CS, Holmes WE, Lussenhop J.  2000.  Atmospheric CO2, soil-N availability, and allocation of biomass and nitrogen by Populus tremuloides. Ecological Applications. 10(1):34-46.
Mikan CJ, Zak DR, Kubiske ME, Pregitzer KS.  2000.  Combined effects of atmospheric CO2 and N availability on the belowground carbon and nitrogen dynamics of aspen mesocosms. Oecologia. 124:432-445.
Curtis PS, Vogel CS, Wang X, Pregitzer KS, Zak DR, Lussenhop J, Kubiske ME, Teeri JA.  2000.  Gas exchange, leaf nitrogen, and growth efficiency of Populus tremuloides in a CO2-enriched atmosphere. Ecological Applications. 10(1):3-17.
Wang X, Curtis PS, Pregitzer KS, Zak DR.  2000.  Genotypic variation in physiological and growth responses of Populus tremuloides to elevated atmospheric CO2 concentration. Tree Physiology. 20:1019-1028.
Pregitzer KS, Zak DR, Maziasz JL, DeForest JL, Curtis PS, Lussenhop J.  2000.  Interactive effects of atmospheric CO2 and soil-N availability on fine roots of Populus tremuloides. Ecological Applications. 10(1):18-33.
Rothstein DE, Zak DR, Pregitzer KS, Curtis PS.  2000.  Kinetics of nitrogen uptake by Populus tremuloides in relation to atmospheric CO2 and soil nitrogen availability. Tree Physiology. 20:265-270.
Zogg GP, Zak DR, Pregitzer KS, Burton AJames.  2000.  Microbial immobilization and the retention of anthropogenic nitrate in a northern hardwood forest. Ecology. 81(7):1858-1866.